Today's Message Index:
----------------------
1. 08:18 AM - Re: TruTrak C servo repair/teardown (Jim Combs)
2. 08:39 AM - Re: TruTrak C servo repair/teardown (Tim Olson)
3. 08:48 AM - Re: TruTrak C servo repair/teardown (David Carr)
4. 09:23 AM - Re: TruTrak C servo repair/teardown (Tim Olson)
5. 01:14 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
6. 01:17 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
7. 01:36 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
8. 02:31 PM - Re: TruTrak C servo repair/teardown (Tim Olson)
9. 04:39 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
10. 04:40 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
11. 04:44 PM - Re: TruTrak C servo repair/teardown (Jim Combs)
12. 05:16 PM - Re: TruTrak C servo repair/teardown (Tim Olson)
13. 05:17 PM - Re: TruTrak (MidContinent) service (Berck E. Nash)
Message 1
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| Subject: | Re: TruTrak C servo repair/teardown |
Are you going to take apart the failed servo and do any kind of
failure analysis? If not, I would be willing to open and take a look.
I too am using the same servo's. 10 years of flying and 1400 hours so
far.
Jim C
On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>
> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
> the original TruTrak folks, since the stories become less positive after that
purchase.
> I would hope that good service will continue, but I'd feel more comfortable if
> the TruTrak guys still do their own repairs.
> Tim
>
>
> On 1/3/2021 10:53 PM, David Saylor wrote:
>
> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the same
day.
>
> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>>
>>
>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>> got tight and binding. Interestingly it releases once in a while like
>> the clutch releases but then binds again. So I pulled it out today,
>> and will start looking into replacement. I would also like to
>> tear it open if it's something that I can do without wrecking anything
>> inside, to see what broke. Does anyone have any teardown pics or
>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>> Just interested in how much $$ I'll be out to get it fixed up and
>> working again. I'd like to keep one as a spare from here out,
>> since I have 2 planes that could use them.
>> Tim
>> ==========
>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>
Message 2
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| Subject: | Re: TruTrak C servo repair/teardown |
I thought I posted a follow-up post on this but I did tear it apart.
The base that the
stepper motor is mounted on contains all the gearing for the autopilot.
All of that
was fine. The stepper motor itself was tight at times. I'd turn it and
after sitting
for a few minutes, it would usually turn ok for a partial revolution,
and then get
tight. I removed the base of the motor, pulled out the center rotor,
and the bearings
were fine. Nothing much out of place, but, I did have one of the 4
screws holding
the motor together that was corroded, and some corrosion between the bottom
of the coil area and the base of the motor. There was a little
particulate on the
placemat after disassembly. The clearances are pretty tight inside, and
my guess
is that it was just corrosion that was the issue. After inserting the
rotor again,
everything was much more free again. I didn't get a chance last night
to clean it
all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
assembly and then my guess is that the servo will be fine. I bought a
spare pair
from a friend of mine that should show today, but I'll try my old one
first and if it
works, I'll just keep using it for the time being.
More to come.
Tim
On 1/5/2021 10:17 AM, Jim Combs wrote:
>
> Are you going to take apart the failed servo and do any kind of
> failure analysis? If not, I would be willing to open and take a look.
> I too am using the same servo's. 10 years of flying and 1400 hours so
> far.
>
> Jim C
>
> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
>> the original TruTrak folks, since the stories become less positive after that
purchase.
>> I would hope that good service will continue, but I'd feel more comfortable
if
>> the TruTrak guys still do their own repairs.
>> Tim
>>
>>
>> On 1/3/2021 10:53 PM, David Saylor wrote:
>>
>> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the
same day.
>>
>> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>>>
>>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>>> got tight and binding. Interestingly it releases once in a while like
>>> the clutch releases but then binds again. So I pulled it out today,
>>> and will start looking into replacement. I would also like to
>>> tear it open if it's something that I can do without wrecking anything
>>> inside, to see what broke. Does anyone have any teardown pics or
>>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>>> Just interested in how much $$ I'll be out to get it fixed up and
>>> working again. I'd like to keep one as a spare from here out,
>>> since I have 2 planes that could use them.
>>> Tim
>>> ==========
>>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>>> ==========
>>> FORUMS -
>>> eferrer" target="_blank">http://forums.matronics.com
>>> ==========
>>> WIKI -
>>> errer" target="_blank">http://wiki.matronics.com
>>> ==========
>>> b Site -
>>> -Matt Dralle, List Admin.
>>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>>> ==========
>>>
>>>
>>>
>
>
Message 3
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| Subject: | Re: TruTrak C servo repair/teardown |
Tim,
Some stepper motor rotors will lose a fair amount of their magnetism when
removed from their stator. This causes the torque of the motor to be
significantly reduced. I don't know if this will be the case with your
motor, but it's worth watching out for.
David
On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting the
> rotor again,
> everything was much more free again. I didn't get a chance last night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
> assembly and then my guess is that the servo will be fine. I bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
> >
> > Are you going to take apart the failed servo and do any kind of
> > failure analysis? If not, I would be willing to open and take a look.
> > I too am using the same servo's. 10 years of flying and 1400 hours so
> > far.
> >
> > Jim C
> >
> > On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
> >> Was that when it was still TruTrak, or through Bendix? I'm a little
> leery of anything but
> >> the original TruTrak folks, since the stories become less positive
> after that purchase.
> >> I would hope that good service will continue, but I'd feel more
> comfortable if
> >> the TruTrak guys still do their own repairs.
> >> Tim
> >>
> >>
> >> On 1/3/2021 10:53 PM, David Saylor wrote:
> >>
> >> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380
> and it looked <brand new>, including the serial number! They turned it
> around the same day.
> >>
> >> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
> >>>
> >>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
> >>> got tight and binding. Interestingly it releases once in a while like
> >>> the clutch releases but then binds again. So I pulled it out today,
> >>> and will start looking into replacement. I would also like to
> >>> tear it open if it's something that I can do without wrecking anything
> >>> inside, to see what broke. Does anyone have any teardown pics or
> >>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
> >>> Just interested in how much $$ I'll be out to get it fixed up and
> >>> working again. I'd like to keep one as a spare from here out,
> >>> since I have 2 planes that could use them.
> >>> Tim
> >>> ==========
> >>> -List" rel="noreferrer" target="_blank">
> http://www.matronics.com/Navigator?RV10-List
> >>> ==========
> >>> FORUMS -
> >>> eferrer" target="_blank">http://forums.matronics.com
> >>> ==========
> >>> WIKI -
> >>> errer" target="_blank">http://wiki.matronics.com
> >>> ==========
> >>> b Site -
> >>> -Matt Dralle, List Admin.
> >>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> >>> ==========
> >>>
> >>>
> >>>
> >
> >
> >
>
>
Message 4
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| Subject: | Re: TruTrak C servo repair/teardown |
I'm assuming it's not an issue with short-term removal?
It would be pretty crazy if pulling it out for 5 minutes reduced the
life by a lot.
I don't intend to keep it out very long. Just enough to clean it up.
Tim
On 1/5/2021 10:46 AM, David Carr wrote:
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism
> when removed from their stator. This causes the torque of the motor
> to be significantly reduced. I don't know if this will be the case
> with your motor, but it's worth watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com
> <mailto:Tim@myrv10.com>> wrote:
>
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the
> autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn
> it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between
> the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight
> inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting
> the
> rotor again,
> everything was much more free again. I didn't get a chance last
> night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and
> lubrication and
> assembly and then my guess is that the servo will be fine. I
> bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
> <mailto:jiminlexky@gmail.com>>
> >
> > Are you going to take apart the failed servo and do any kind of
> > failure analysis? If not, I would be willing to open and take a
> look.
> > I too am using the same servo's. 10 years of flying and 1400
> hours so
> > far.
> >
> > Jim C
> >
> > On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com
> <mailto:Tim@myrv10.com>> wrote:
> >> Was that when it was still TruTrak, or through Bendix? I'm a
> little leery of anything but
> >> the original TruTrak folks, since the stories become less
> positive after that purchase.
> >> I would hope that good service will continue, but I'd feel more
> comfortable if
> >> the TruTrak guys still do their own repairs.
> >> Tim
> >>
> >>
> >> On 1/3/2021 10:53 PM, David Saylor wrote:
> >>
> >> TruTrak overhauled a roll servo for me in Aug 2019. The cost
> was $380 and it looked <brand new>, including the serial number!
> They turned it around the same day.
> >>
> >> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com
> <mailto:Tim@myrv10.com>> wrote:
> >>>
> >>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing
> (aileron)
> >>> got tight and binding. Interestingly it releases once in a
> while like
> >>> the clutch releases but then binds again. So I pulled it out
> today,
> >>> and will start looking into replacement. I would also like to
> >>> tear it open if it's something that I can do without wrecking
> anything
> >>> inside, to see what broke. Does anyone have any teardown pics or
> >>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix)
> before?
> >>> Just interested in how much $$ I'll be out to get it fixed up and
> >>> working again. I'd like to keep one as a spare from here out,
> >>> since I have 2 planes that could use them.
> >>> Tim
> >>> ==========
> >>> -List" rel="noreferrer"
> target="_blank">http://www.matronics.com/Navigator?RV10-List
> <http://www.matronics.com/Navigator?RV10-List>
> >>> ==========
> >>> FORUMS -
> >>> eferrer" target="_blank">http://forums.matronics.com
> <http://forums.matronics.com>
> >>> ==========
> >>> WIKI -
> >>> errer" target="_blank">http://wiki.matronics.com
> <http://wiki.matronics.com>
> >>> ==========
> >>> b Site -
> >>> -Matt Dralle, List Admin.
> >>> rel="noreferrer"
> target="_blank">http://www.matronics.com/contribution
> <http://www.matronics.com/contribution>
> >>> ==========
> >>>
> >>>
> >>>
> >
> >
> >
>
> ==========
> -List" rel="noreferrer"
> target="_blank">http://www.matronics.com/Navigator?RV10-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 5
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| Subject: | Re: TruTrak C servo repair/teardown |
Thanks Tim.
Interesting.
On Tue, Jan 5, 2021 at 11:43 AM Tim Olson <Tim@myrv10.com> wrote:
>
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting the
> rotor again,
> everything was much more free again. I didn't get a chance last night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
> assembly and then my guess is that the servo will be fine. I bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
> >
> > Are you going to take apart the failed servo and do any kind of
> > failure analysis? If not, I would be willing to open and take a look.
> > I too am using the same servo's. 10 years of flying and 1400 hours so
> > far.
> >
> > Jim C
> >
> > On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
> >> Was that when it was still TruTrak, or through Bendix? I'm a little leery
of anything but
> >> the original TruTrak folks, since the stories become less positive after that
purchase.
> >> I would hope that good service will continue, but I'd feel more comfortable
if
> >> the TruTrak guys still do their own repairs.
> >> Tim
> >>
> >>
> >> On 1/3/2021 10:53 PM, David Saylor wrote:
> >>
> >> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and
it looked <brand new>, including the serial number! They turned it around the
same day.
> >>
> >> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
> >>>
> >>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
> >>> got tight and binding. Interestingly it releases once in a while like
> >>> the clutch releases but then binds again. So I pulled it out today,
> >>> and will start looking into replacement. I would also like to
> >>> tear it open if it's something that I can do without wrecking anything
> >>> inside, to see what broke. Does anyone have any teardown pics or
> >>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
> >>> Just interested in how much $$ I'll be out to get it fixed up and
> >>> working again. I'd like to keep one as a spare from here out,
> >>> since I have 2 planes that could use them.
> >>> Tim
> >>> ==========
> >>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
> >>> ==========
> >>> FORUMS -
> >>> eferrer" target="_blank">http://forums.matronics.com
> >>> ==========
> >>> WIKI -
> >>> errer" target="_blank">http://wiki.matronics.com
> >>> ==========
> >>> b Site -
> >>> -Matt Dralle, List Admin.
> >>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> >>> ==========
> >>>
> >>>
> >>>
> >
> >
> >
>
>
Message 6
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| Subject: | Re: TruTrak C servo repair/teardown |
Yes, for that reason, I have never taken steppers apart. If they are
rough for any reason, I would just order a new one from Amazon and
replace it. I use steppers for robotics. I have never seen one fail.
But, they are not sealed. Humidity could cause corrosion.
On Tue, Jan 5, 2021 at 11:53 AM David Carr <junk@dcarr.org> wrote:
>
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's worth
watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>>
>>
>> I thought I posted a follow-up post on this but I did tear it apart.
>> The base that the
>> stepper motor is mounted on contains all the gearing for the autopilot.
>> All of that
>> was fine. The stepper motor itself was tight at times. I'd turn it and
>> after sitting
>> for a few minutes, it would usually turn ok for a partial revolution,
>> and then get
>> tight. I removed the base of the motor, pulled out the center rotor,
>> and the bearings
>> were fine. Nothing much out of place, but, I did have one of the 4
>> screws holding
>> the motor together that was corroded, and some corrosion between the bottom
>> of the coil area and the base of the motor. There was a little
>> particulate on the
>> placemat after disassembly. The clearances are pretty tight inside, and
>> my guess
>> is that it was just corrosion that was the issue. After inserting the
>> rotor again,
>> everything was much more free again. I didn't get a chance last night
>> to clean it
>> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
>> assembly and then my guess is that the servo will be fine. I bought a
>> spare pair
>> from a friend of mine that should show today, but I'll try my old one
>> first and if it
>> works, I'll just keep using it for the time being.
>>
>> More to come.
>> Tim
>>
>>
>> On 1/5/2021 10:17 AM, Jim Combs wrote:
>> >
>> > Are you going to take apart the failed servo and do any kind of
>> > failure analysis? If not, I would be willing to open and take a look.
>> > I too am using the same servo's. 10 years of flying and 1400 hours so
>> > far.
>> >
>> > Jim C
>> >
>> > On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>> >> Was that when it was still TruTrak, or through Bendix? I'm a little leery
of anything but
>> >> the original TruTrak folks, since the stories become less positive after
that purchase.
>> >> I would hope that good service will continue, but I'd feel more comfortable
if
>> >> the TruTrak guys still do their own repairs.
>> >> Tim
>> >>
>> >>
>> >> On 1/3/2021 10:53 PM, David Saylor wrote:
>> >>
>> >> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and
it looked <brand new>, including the serial number! They turned it around the
same day.
>> >>
>> >> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>> >>>
>> >>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>> >>> got tight and binding. Interestingly it releases once in a while like
>> >>> the clutch releases but then binds again. So I pulled it out today,
>> >>> and will start looking into replacement. I would also like to
>> >>> tear it open if it's something that I can do without wrecking anything
>> >>> inside, to see what broke. Does anyone have any teardown pics or
>> >>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>> >>> Just interested in how much $$ I'll be out to get it fixed up and
>> >>> working again. I'd like to keep one as a spare from here out,
>> >>> since I have 2 planes that could use them.
>> >>> Tim
>> >>> ==========
>> >>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> >>> ==========
>> >>> FORUMS -
>> >>> eferrer" target="_blank">http://forums.matronics.com
>> >>> ==========
>> >>> WIKI -
>> >>> errer" target="_blank">http://wiki.matronics.com
>> >>> ==========
>> >>> b Site -
>> >>> -Matt Dralle, List Admin.
>> >>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> >>> ==========
>> >>>
>> >>>
>> >>>
>> >
>> >
>> >
>>
>> ==========
>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
Message 7
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| Subject: | Re: TruTrak C servo repair/teardown |
Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
standardized and are produced in very large quantities. Makes them
really cheap to replace.
On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>
> I'm assuming it's not an issue with short-term removal?
> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
> I don't intend to keep it out very long. Just enough to clean it up.
> Tim
>
> On 1/5/2021 10:46 AM, David Carr wrote:
>
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's worth
watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>>
>>
>> I thought I posted a follow-up post on this but I did tear it apart.
>> The base that the
>> stepper motor is mounted on contains all the gearing for the autopilot.
>> All of that
>> was fine. The stepper motor itself was tight at times. I'd turn it and
>> after sitting
>> for a few minutes, it would usually turn ok for a partial revolution,
>> and then get
>> tight. I removed the base of the motor, pulled out the center rotor,
>> and the bearings
>> were fine. Nothing much out of place, but, I did have one of the 4
>> screws holding
>> the motor together that was corroded, and some corrosion between the bottom
>> of the coil area and the base of the motor. There was a little
>> particulate on the
>> placemat after disassembly. The clearances are pretty tight inside, and
>> my guess
>> is that it was just corrosion that was the issue. After inserting the
>> rotor again,
>> everything was much more free again. I didn't get a chance last night
>> to clean it
>> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
>> assembly and then my guess is that the servo will be fine. I bought a
>> spare pair
>> from a friend of mine that should show today, but I'll try my old one
>> first and if it
>> works, I'll just keep using it for the time being.
>>
>> More to come.
>> Tim
>>
>>
>> On 1/5/2021 10:17 AM, Jim Combs wrote:
>> >
>> > Are you going to take apart the failed servo and do any kind of
>> > failure analysis? If not, I would be willing to open and take a look.
>> > I too am using the same servo's. 10 years of flying and 1400 hours so
>> > far.
>> >
>> > Jim C
>> >
>> > On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>> >> Was that when it was still TruTrak, or through Bendix? I'm a little leery
of anything but
>> >> the original TruTrak folks, since the stories become less positive after
that purchase.
>> >> I would hope that good service will continue, but I'd feel more comfortable
if
>> >> the TruTrak guys still do their own repairs.
>> >> Tim
>> >>
>> >>
>> >> On 1/3/2021 10:53 PM, David Saylor wrote:
>> >>
>> >> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and
it looked <brand new>, including the serial number! They turned it around the
same day.
>> >>
>> >> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>> >>>
>> >>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>> >>> got tight and binding. Interestingly it releases once in a while like
>> >>> the clutch releases but then binds again. So I pulled it out today,
>> >>> and will start looking into replacement. I would also like to
>> >>> tear it open if it's something that I can do without wrecking anything
>> >>> inside, to see what broke. Does anyone have any teardown pics or
>> >>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>> >>> Just interested in how much $$ I'll be out to get it fixed up and
>> >>> working again. I'd like to keep one as a spare from here out,
>> >>> since I have 2 planes that could use them.
>> >>> Tim
>> >>> ==========
>> >>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> >>> ==========
>> >>> FORUMS -
>> >>> eferrer" target="_blank">http://forums.matronics.com
>> >>> ==========
>> >>> WIKI -
>> >>> errer" target="_blank">http://wiki.matronics.com
>> >>> ==========
>> >>> b Site -
>> >>> -Matt Dralle, List Admin.
>> >>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> >>> ==========
>> >>>
>> >>>
>> >>>
>> >
>> >
>> >
>>
>> ==========
>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>
Message 8
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| Subject: | Re: TruTrak C servo repair/teardown |
It is a NEMA 23 type. I wasn't having a great time trying to find the
exact same servo, however. Maybe you or someone who deals with these
things would. I think the best I found was mid-$300's for price. If the
motors could be bought for $100 it would be a no brainer. Here's the
info off my DSB-C servo. I noticed that the newer ones I got from my
friend don't have the manufacturer info. Also, the URLs of most websites
I found are either broken, or domains missing.
Superior Electric
Slo-Syn Motor
Impedance Protected Rockford IL
Stepping Motor
Type KML062F03
4.4 VDC 1.5A
www.slosyn.com
<https://www.google.com/url?q=http://www.slosyn.com&sa=D&source=calendar&usd=2&usg=AOvVaw1rQ8siWd6wG9fRv4dfoMSA>
200 Steps/Rev
Connect PER213803
044921795
4 leads, 2.93 ohms, 16.9 mH inductance.
Bipolar Holding Torque 250 oz-in (177 Ncm).
Max Overhang Load 15lbs
Max Thrust Load 25lbs
Residual Torque 6 oz-in
Typical Motor Weight 2.3lbs
KML06 = NEMA 23 type
Maybe that will make it easier to find the match.
Tim
On 1/5/2021 3:35 PM, Jim Combs wrote:
>
> Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
> standardized and are produced in very large quantities. Makes them
> really cheap to replace.
>
>
> On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>> I'm assuming it's not an issue with short-term removal?
>> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
>> I don't intend to keep it out very long. Just enough to clean it up.
>> Tim
>>
>> On 1/5/2021 10:46 AM, David Carr wrote:
>>
>> Tim,
>>
>> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's
worth watching out for.
>>
>> David
>>
>> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>>>
>>> I thought I posted a follow-up post on this but I did tear it apart.
>>> The base that the
>>> stepper motor is mounted on contains all the gearing for the autopilot.
>>> All of that
>>> was fine. The stepper motor itself was tight at times. I'd turn it and
>>> after sitting
>>> for a few minutes, it would usually turn ok for a partial revolution,
>>> and then get
>>> tight. I removed the base of the motor, pulled out the center rotor,
>>> and the bearings
>>> were fine. Nothing much out of place, but, I did have one of the 4
>>> screws holding
>>> the motor together that was corroded, and some corrosion between the bottom
>>> of the coil area and the base of the motor. There was a little
>>> particulate on the
>>> placemat after disassembly. The clearances are pretty tight inside, and
>>> my guess
>>> is that it was just corrosion that was the issue. After inserting the
>>> rotor again,
>>> everything was much more free again. I didn't get a chance last night
>>> to clean it
>>> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
>>> assembly and then my guess is that the servo will be fine. I bought a
>>> spare pair
>>> from a friend of mine that should show today, but I'll try my old one
>>> first and if it
>>> works, I'll just keep using it for the time being.
>>>
>>> More to come.
>>> Tim
>>>
>>>
>>> On 1/5/2021 10:17 AM, Jim Combs wrote:
>>>>
>>>> Are you going to take apart the failed servo and do any kind of
>>>> failure analysis? If not, I would be willing to open and take a look.
>>>> I too am using the same servo's. 10 years of flying and 1400 hours so
>>>> far.
>>>>
>>>> Jim C
>>>>
>>>> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>>>>> Was that when it was still TruTrak, or through Bendix? I'm a little leery
of anything but
>>>>> the original TruTrak folks, since the stories become less positive after
that purchase.
>>>>> I would hope that good service will continue, but I'd feel more comfortable
if
>>>>> the TruTrak guys still do their own repairs.
>>>>> Tim
>>>>>
>>>>>
>>>>> On 1/3/2021 10:53 PM, David Saylor wrote:
>>>>>
>>>>> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and
it looked <brand new>, including the serial number! They turned it around the
same day.
>>>>>
>>>>> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>>>>>>
>>>>>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>>>>>> got tight and binding. Interestingly it releases once in a while like
>>>>>> the clutch releases but then binds again. So I pulled it out today,
>>>>>> and will start looking into replacement. I would also like to
>>>>>> tear it open if it's something that I can do without wrecking anything
>>>>>> inside, to see what broke. Does anyone have any teardown pics or
>>>>>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>>>>>> Just interested in how much $$ I'll be out to get it fixed up and
>>>>>> working again. I'd like to keep one as a spare from here out,
>>>>>> since I have 2 planes that could use them.
>>>>>> Tim
>>>>>> ==========
>>>>>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>>>>>> ==========
>>>>>> FORUMS -
>>>>>> eferrer" target="_blank">http://forums.matronics.com
>>>>>> ==========
>>>>>> WIKI -
>>>>>> errer" target="_blank">http://wiki.matronics.com
>>>>>> ==========
>>>>>> b Site -
>>>>>> -Matt Dralle, List Admin.
>>>>>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>>>>>> ==========
>>>>>>
>>>>>>
>>>>>>
>>>>
>>>>
>>> ==========
>>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>>> ==========
>>> FORUMS -
>>> eferrer" target="_blank">http://forums.matronics.com
>>> ==========
>>> WIKI -
>>> errer" target="_blank">http://wiki.matronics.com
>>> ==========
>>> b Site -
>>> -Matt Dralle, List Admin.
>>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>>> ==========
>>>
>>>
>>>
>
>
Message 9
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| Subject: | Re: TruTrak C servo repair/teardown |
would you measure the length of the stepper from the face to the back
end. I think that size motor is available for $23 on amazon.
On Tue, Jan 5, 2021 at 5:36 PM Tim Olson <Tim@myrv10.com> wrote:
>
> It is a NEMA 23 type. I wasn't having a great time trying to find the exact same
servo, however. Maybe you or someone who deals with these things would. I
think the best I found was mid-$300's for price. If the motors could be bought
for $100 it would be a no brainer. Here's the info off my DSB-C servo. I noticed
that the newer ones I got from my friend don't have the manufacturer info.
Also, the URLs of most websites I found are either broken, or domains missing.
> Superior Electric
> Slo-Syn Motor
> Impedance Protected Rockford IL
>
> Stepping Motor
> Type KML062F03
> 4.4 VDC 1.5A
> www.slosyn.com
> 200 Steps/Rev
> Connect PER213803
> 044921795
>
> 4 leads, 2.93 ohms, 16.9 mH inductance.
> Bipolar Holding Torque 250 oz-in (177 Ncm).
> Max Overhang Load 15lbs
> Max Thrust Load 25lbs
> Residual Torque 6 oz-in
> Typical Motor Weight 2.3lbs
>
> KML06 = NEMA 23 type
>
>
> Maybe that will make it easier to find the match.
> Tim
>
>
> On 1/5/2021 3:35 PM, Jim Combs wrote:
>
>
> Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
> standardized and are produced in very large quantities. Makes them
> really cheap to replace.
>
>
> On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>
> I'm assuming it's not an issue with short-term removal?
> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
> I don't intend to keep it out very long. Just enough to clean it up.
> Tim
>
> On 1/5/2021 10:46 AM, David Carr wrote:
>
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's worth
watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting the
> rotor again,
> everything was much more free again. I didn't get a chance last night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
> assembly and then my guess is that the servo will be fine. I bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
>
>
> Are you going to take apart the failed servo and do any kind of
> failure analysis? If not, I would be willing to open and take a look.
> I too am using the same servo's. 10 years of flying and 1400 hours so
> far.
>
> Jim C
>
> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>
> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
> the original TruTrak folks, since the stories become less positive after that
purchase.
> I would hope that good service will continue, but I'd feel more comfortable if
> the TruTrak guys still do their own repairs.
> Tim
>
>
> On 1/3/2021 10:53 PM, David Saylor wrote:
>
> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the same
day.
>
> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>
>
> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
> got tight and binding. Interestingly it releases once in a while like
> the clutch releases but then binds again. So I pulled it out today,
> and will start looking into replacement. I would also like to
> tear it open if it's something that I can do without wrecking anything
> inside, to see what broke. Does anyone have any teardown pics or
> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
> Just interested in how much $$ I'll be out to get it fixed up and
> working again. I'd like to keep one as a spare from here out,
> since I have 2 planes that could use them.
> Tim
> ==========
> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
> ==========
> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 10
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| Subject: | Re: TruTrak C servo repair/teardown |
$29.99
https://www.amazon.com/Stepper-Motor-Bipolar-269oz-Router/dp/B00PNEPI0A/ref=sr_1_7?dchild=1&keywords=nema+23+stepper+motor&qid=1609893521&sr=8-7
Should be pretty much a drop in replacement.
On Tue, Jan 5, 2021 at 5:36 PM Tim Olson <Tim@myrv10.com> wrote:
>
> It is a NEMA 23 type. I wasn't having a great time trying to find the exact same
servo, however. Maybe you or someone who deals with these things would. I
think the best I found was mid-$300's for price. If the motors could be bought
for $100 it would be a no brainer. Here's the info off my DSB-C servo. I noticed
that the newer ones I got from my friend don't have the manufacturer info.
Also, the URLs of most websites I found are either broken, or domains missing.
> Superior Electric
> Slo-Syn Motor
> Impedance Protected Rockford IL
>
> Stepping Motor
> Type KML062F03
> 4.4 VDC 1.5A
> www.slosyn.com
> 200 Steps/Rev
> Connect PER213803
> 044921795
>
> 4 leads, 2.93 ohms, 16.9 mH inductance.
> Bipolar Holding Torque 250 oz-in (177 Ncm).
> Max Overhang Load 15lbs
> Max Thrust Load 25lbs
> Residual Torque 6 oz-in
> Typical Motor Weight 2.3lbs
>
> KML06 = NEMA 23 type
>
>
> Maybe that will make it easier to find the match.
> Tim
>
>
> On 1/5/2021 3:35 PM, Jim Combs wrote:
>
>
> Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
> standardized and are produced in very large quantities. Makes them
> really cheap to replace.
>
>
> On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>
> I'm assuming it's not an issue with short-term removal?
> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
> I don't intend to keep it out very long. Just enough to clean it up.
> Tim
>
> On 1/5/2021 10:46 AM, David Carr wrote:
>
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's worth
watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting the
> rotor again,
> everything was much more free again. I didn't get a chance last night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
> assembly and then my guess is that the servo will be fine. I bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
>
>
> Are you going to take apart the failed servo and do any kind of
> failure analysis? If not, I would be willing to open and take a look.
> I too am using the same servo's. 10 years of flying and 1400 hours so
> far.
>
> Jim C
>
> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>
> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
> the original TruTrak folks, since the stories become less positive after that
purchase.
> I would hope that good service will continue, but I'd feel more comfortable if
> the TruTrak guys still do their own repairs.
> Tim
>
>
> On 1/3/2021 10:53 PM, David Saylor wrote:
>
> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the same
day.
>
> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>
>
> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
> got tight and binding. Interestingly it releases once in a while like
> the clutch releases but then binds again. So I pulled it out today,
> and will start looking into replacement. I would also like to
> tear it open if it's something that I can do without wrecking anything
> inside, to see what broke. Does anyone have any teardown pics or
> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
> Just interested in how much $$ I'll be out to get it fixed up and
> working again. I'd like to keep one as a spare from here out,
> since I have 2 planes that could use them.
> Tim
> ==========
> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
> ==========
> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
> ==========
> FORUMS -
> eferrer" target="_blank">http://forums.matronics.com
> ==========
> WIKI -
> errer" target="_blank">http://wiki.matronics.com
> ==========
> b Site -
> -Matt Dralle, List Admin.
> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 11
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|
| Subject: | Re: TruTrak C servo repair/teardown |
Typically the motors are driven with a constant current driver. It
does not matter that the winding voltage is 4 volts. The drivers will
chop the current to maintain the 1.5 amps. As the motor speed
increases there is a back EMF that has to be overcome. Like I said,
this should be a drop in replacement for that stepper motor.
Just my opinion.
JIm C
On Tue, Jan 5, 2021 at 5:36 PM Tim Olson <Tim@myrv10.com> wrote:
>
> It is a NEMA 23 type. I wasn't having a great time trying to find the exact same
servo, however. Maybe you or someone who deals with these things would. I
think the best I found was mid-$300's for price. If the motors could be bought
for $100 it would be a no brainer. Here's the info off my DSB-C servo. I noticed
that the newer ones I got from my friend don't have the manufacturer info.
Also, the URLs of most websites I found are either broken, or domains missing.
> Superior Electric
> Slo-Syn Motor
> Impedance Protected Rockford IL
>
> Stepping Motor
> Type KML062F03
> 4.4 VDC 1.5A
> www.slosyn.com
> 200 Steps/Rev
> Connect PER213803
> 044921795
>
> 4 leads, 2.93 ohms, 16.9 mH inductance.
> Bipolar Holding Torque 250 oz-in (177 Ncm).
> Max Overhang Load 15lbs
> Max Thrust Load 25lbs
> Residual Torque 6 oz-in
> Typical Motor Weight 2.3lbs
>
> KML06 = NEMA 23 type
>
>
> Maybe that will make it easier to find the match.
> Tim
>
>
> On 1/5/2021 3:35 PM, Jim Combs wrote:
>
>
> Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
> standardized and are produced in very large quantities. Makes them
> really cheap to replace.
>
>
> On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>
> I'm assuming it's not an issue with short-term removal?
> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
> I don't intend to keep it out very long. Just enough to clean it up.
> Tim
>
> On 1/5/2021 10:46 AM, David Carr wrote:
>
> Tim,
>
> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's worth
watching out for.
>
> David
>
> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>
>
> I thought I posted a follow-up post on this but I did tear it apart.
> The base that the
> stepper motor is mounted on contains all the gearing for the autopilot.
> All of that
> was fine. The stepper motor itself was tight at times. I'd turn it and
> after sitting
> for a few minutes, it would usually turn ok for a partial revolution,
> and then get
> tight. I removed the base of the motor, pulled out the center rotor,
> and the bearings
> were fine. Nothing much out of place, but, I did have one of the 4
> screws holding
> the motor together that was corroded, and some corrosion between the bottom
> of the coil area and the base of the motor. There was a little
> particulate on the
> placemat after disassembly. The clearances are pretty tight inside, and
> my guess
> is that it was just corrosion that was the issue. After inserting the
> rotor again,
> everything was much more free again. I didn't get a chance last night
> to clean it
> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
> assembly and then my guess is that the servo will be fine. I bought a
> spare pair
> from a friend of mine that should show today, but I'll try my old one
> first and if it
> works, I'll just keep using it for the time being.
>
> More to come.
> Tim
>
>
> On 1/5/2021 10:17 AM, Jim Combs wrote:
>
>
> Are you going to take apart the failed servo and do any kind of
> failure analysis? If not, I would be willing to open and take a look.
> I too am using the same servo's. 10 years of flying and 1400 hours so
> far.
>
> Jim C
>
> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>
> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
> the original TruTrak folks, since the stories become less positive after that
purchase.
> I would hope that good service will continue, but I'd feel more comfortable if
> the TruTrak guys still do their own repairs.
> Tim
>
>
> On 1/3/2021 10:53 PM, David Saylor wrote:
>
> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the same
day.
>
> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>
>
> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
> got tight and binding. Interestingly it releases once in a while like
> the clutch releases but then binds again. So I pulled it out today,
> and will start looking into replacement. I would also like to
> tear it open if it's something that I can do without wrecking anything
> inside, to see what broke. Does anyone have any teardown pics or
> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
> Just interested in how much $$ I'll be out to get it fixed up and
> working again. I'd like to keep one as a spare from here out,
> since I have 2 planes that could use them.
> Tim
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Message 12
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| Subject: | Re: TruTrak C servo repair/teardown |
Jim,
Thanks for the links. It's tempting to try one of those. The things
that stop
me would be:
I don't know the manufacturer at all, or reputation. And I don't know with
the different wire colors how they'd match up. I'm sure it would work.
Your point
about the amps would hopefully be accurate too. It's just more
comfortable to
buy the exact same part, because then you'd know for sure it would
work. As it is,
I think if my servo no longer works, I'd try one of these just for
kicks. The price is
right. But, I also bought the spares now, so I'd probably use that one
and keep
the Amazon one for a spare. Also, the gear on the shaft is held on by
a small 1/16"
roll pin, so I'd need to drill the shaft on the new one and install a
new roll pin to
use it. But it certainly is an option.
I measured the height of the servo from the mount base to the top and it's
something between exactly 3" and 3-1/16". I had a crappy tape measure
near me. :)
Here are pics of the servo I pulled out, with pics of the guts.
https://www.myrv10.com/N104CD/maintenance/TruTrak_Servo/
I cleaned off the corrosion and lubed the bearings and blew out the
inside after
a light scotchbrite of the inside and rotor and now it's actually more
free than the
brand new one. In the link above, the pic near the center of the page
is of the
2 new ones I just bought.
Anyway, I posted the pics in case anyone is interested.
Oh, and for any of you guys that offered your servos for sale, let me
know if you
want your info passed on to someone else who's interested. I had a guy
write me
on VAF who's looking for a servo too.
Tim
On 1/5/2021 6:43 PM, Jim Combs wrote:
>
> Typically the motors are driven with a constant current driver. It
> does not matter that the winding voltage is 4 volts. The drivers will
> chop the current to maintain the 1.5 amps. As the motor speed
> increases there is a back EMF that has to be overcome. Like I said,
> this should be a drop in replacement for that stepper motor.
>
> Just my opinion.
>
> JIm C
>
> On Tue, Jan 5, 2021 at 5:36 PM Tim Olson <Tim@myrv10.com> wrote:
>> It is a NEMA 23 type. I wasn't having a great time trying to find the exact
same servo, however. Maybe you or someone who deals with these things would. I
think the best I found was mid-$300's for price. If the motors could be bought
for $100 it would be a no brainer. Here's the info off my DSB-C servo. I noticed
that the newer ones I got from my friend don't have the manufacturer info.
Also, the URLs of most websites I found are either broken, or domains missing.
>> Superior Electric
>> Slo-Syn Motor
>> Impedance Protected Rockford IL
>>
>> Stepping Motor
>> Type KML062F03
>> 4.4 VDC 1.5A
>> www.slosyn.com
>> 200 Steps/Rev
>> Connect PER213803
>> 044921795
>>
>> 4 leads, 2.93 ohms, 16.9 mH inductance.
>> Bipolar Holding Torque 250 oz-in (177 Ncm).
>> Max Overhang Load 15lbs
>> Max Thrust Load 25lbs
>> Residual Torque 6 oz-in
>> Typical Motor Weight 2.3lbs
>>
>> KML06 = NEMA 23 type
>>
>>
>> Maybe that will make it easier to find the match.
>> Tim
>>
>>
>>
>>
>>
>> On 1/5/2021 3:35 PM, Jim Combs wrote:
>>
>>
>> Is it a NEMA 23 Stepper or NEMA 17 stepper. These are very
>> standardized and are produced in very large quantities. Makes them
>> really cheap to replace.
>>
>>
>> On Tue, Jan 5, 2021 at 12:28 PM Tim Olson <Tim@myrv10.com> wrote:
>>
>> I'm assuming it's not an issue with short-term removal?
>> It would be pretty crazy if pulling it out for 5 minutes reduced the life by
a lot.
>> I don't intend to keep it out very long. Just enough to clean it up.
>> Tim
>>
>> On 1/5/2021 10:46 AM, David Carr wrote:
>>
>> Tim,
>>
>> Some stepper motor rotors will lose a fair amount of their magnetism when removed
from their stator. This causes the torque of the motor to be significantly
reduced. I don't know if this will be the case with your motor, but it's
worth watching out for.
>>
>> David
>>
>> On Tue, Jan 5, 2021 at 10:42 AM Tim Olson <Tim@myrv10.com> wrote:
>>
>>
>> I thought I posted a follow-up post on this but I did tear it apart.
>> The base that the
>> stepper motor is mounted on contains all the gearing for the autopilot.
>> All of that
>> was fine. The stepper motor itself was tight at times. I'd turn it and
>> after sitting
>> for a few minutes, it would usually turn ok for a partial revolution,
>> and then get
>> tight. I removed the base of the motor, pulled out the center rotor,
>> and the bearings
>> were fine. Nothing much out of place, but, I did have one of the 4
>> screws holding
>> the motor together that was corroded, and some corrosion between the bottom
>> of the coil area and the base of the motor. There was a little
>> particulate on the
>> placemat after disassembly. The clearances are pretty tight inside, and
>> my guess
>> is that it was just corrosion that was the issue. After inserting the
>> rotor again,
>> everything was much more free again. I didn't get a chance last night
>> to clean it
>> all up, but I plan to do a 2nd disassembly and cleaning and lubrication and
>> assembly and then my guess is that the servo will be fine. I bought a
>> spare pair
>> from a friend of mine that should show today, but I'll try my old one
>> first and if it
>> works, I'll just keep using it for the time being.
>>
>> More to come.
>> Tim
>>
>>
>> On 1/5/2021 10:17 AM, Jim Combs wrote:
>>
>>
>> Are you going to take apart the failed servo and do any kind of
>> failure analysis? If not, I would be willing to open and take a look.
>> I too am using the same servo's. 10 years of flying and 1400 hours so
>> far.
>>
>> Jim C
>>
>> On Mon, Jan 4, 2021 at 12:14 AM Tim Olson <Tim@myrv10.com> wrote:
>>
>> Was that when it was still TruTrak, or through Bendix? I'm a little leery of
anything but
>> the original TruTrak folks, since the stories become less positive after that
purchase.
>> I would hope that good service will continue, but I'd feel more comfortable
if
>> the TruTrak guys still do their own repairs.
>> Tim
>>
>>
>> On 1/3/2021 10:53 PM, David Saylor wrote:
>>
>> TruTrak overhauled a roll servo for me in Aug 2019. The cost was $380 and it
looked <brand new>, including the serial number! They turned it around the
same day.
>>
>> On Sun, Jan 3, 2021 at 16:55 Tim Olson <Tim@myrv10.com> wrote:
>>
>>
>> Hey all, my 16 year old TruTrack DSB-C type servo in my wing (aileron)
>> got tight and binding. Interestingly it releases once in a while like
>> the clutch releases but then binds again. So I pulled it out today,
>> and will start looking into replacement. I would also like to
>> tear it open if it's something that I can do without wrecking anything
>> inside, to see what broke. Does anyone have any teardown pics or
>> has anyone had a servo rebuilt by TruTrak (I guess now Bendix) before?
>> Just interested in how much $$ I'll be out to get it fixed up and
>> working again. I'd like to keep one as a spare from here out,
>> since I have 2 planes that could use them.
>> Tim
>> ==========
>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>>
>>
>> ==========
>> -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>>
>>
>>
>>
>
>
Message 13
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|
| Subject: | Re: TruTrak (MidContinent) service |
You can drive the Garmin autopilot with a G5 which is "only" $1,300...
On Tue, Jan 5, 2021 at 6:06 PM Kelly McMullen <kellym@aviating.com> wrote:
>
> I am under the impression that to install a Garmin or Dynon based
> autopilot you need at least one of their screens. The servos are cheap
> at $750 and they mount same as TT. But a system of screen, ADAHRS and
> wiring is going to cost probably 2-3 times what the servos do, even in a
> 7" screen size.
>
> On 1/4/2021 9:33 AM, Phil Perry wrote:
> >
> > Has anyone replaced their TT autopilot with the Garmin? Specifically
> with a G3X based system?
> >
> > I=99m curious what the process was like to reconfigure the wiring
and
> remount the servos/linkages.
> >
> > I=99m not looking forward to replacing mine, but it=99s goi
ng to become
> inevitable at some point.
> >
> > Phil
> >
> > Sent from my iPhone
> >
> >> On Jan 4, 2021, at 8:34 AM, Saint Aviation <jesse@saintaviation.com>
> wrote:
> >>
> jesse@saintaviation.com>
> >>
> >> That=99s interesting. I have had nothing but good service from B
ruce and
> Mid Continent. Better even than with TruTrak back in the day. Bendix King
,
> on the other hand, I won=99t even try calling. I feel like I know m
ore than
> their tech guy does. Probably not the case, but when I first started
> dealing with them, it probably was the case. I buy from Edmo or Aviall an
d
> use Mid Continent for service, so I don=99t ever even have to deal
with BK.
> On the experimental stuff, however, I can=99t speak to Mid Continen
t=99s
> knowledge. As time goes on, I am sure they will get better and better.
> >>
> >> Jesse Saint
> >> Saint Aviation, Inc.
> >> jesse@saintaviation.com
> >> C: 352-427-0285
> >> F: 815-377-3694
> >>
> >>> On Jan 4, 2021, at 9:51 AM, Doc <docclv@windstream.net> wrote:
> >>>
> >>>
> >>> Guys: Tim's concerns about MidContinent's TruTrak service is
> legitimate. It took me 7 months! and I would bet 100 emails and phone
> calls with Zach Williamson at Bendix King and Bruce Grammon at Midcontini
nt
> to to get the proper wiring schematics to make a Sorcerer work in my late
st
> 10 last year. Bruce had no idea what a TruTrak was until last June and
> admitted that Bendix King did not supply MidContinent with Mannuals, etc.
> even though MidContinent was the authorized repair center for TruTrak. I
> sent the trim module (which MidContinent lost) and the Head to MidContine
nt
> Two times to be checked out only for Bruce to tell me it checked OK on th
e
> bench. I finally got Zack at Bendix King to Get off his A-- and look at
> Installation Manuals IN DETAIL. He said that the schematics sent with th
e
> Installation manuals did not show the changes in the newer units and Trim
> modules. Once he shared that information with me, I now have a working
> Blue Screen (newer Sorcerer) that w!
> o!
> > r!
> >> ks. Like I said, this Saga took only 7 Months and several hundred
> dollars in shipping and a new Trim Module from EDMO Industries in
> Washington I would NEVER do business with Bendix King or MidContinent
> again if I could avoid it. Doc N123CV and N784DC
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
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>
>
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