Today's Message Index:
----------------------
1. 12:22 AM - Re: Stabilator Trim Motor (Hartley Postlethwaite)
2. 12:22 AM - Re: Stabilator Trim Motor (Hartley Postlethwaite)
3. 06:53 AM - Re: Stabilator Trim Motor (Anthony Royal)
4. 10:18 AM - Re: Stabilator Trim Motor (John Cabrera)
5. 02:21 PM - Re: Stabilator Trim Motor (Anthony Royal)
6. 04:51 PM - Re: Stabilator Trim Motor (William Geipel)
Message 1
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| Subject: | Re: Stabilator Trim Motor |
Do you have any good pictures? This could be a good small comment to put in the
next Red Alert. Deadline is the end of this month for submissions.
Feel free to send me a PM.
Postal
RPA President
FlyingHartley@gmail.com
Message 2
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| Subject: | Re: Stabilator Trim Motor |
Do you have any good pictures? This could be a good small comment to put in the
next Red Alert. Deadline is the end of this month for submissions.
Feel free to send me a PM.
Postal
RPA President
FlyingHartley@gmail.com
Message 3
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| Subject: | Re: Stabilator Trim Motor |
The tech still has the trim motor assy as he has to get the old bearings ou
t of the housing and order new bearings (metric you know) and lubricate eve
rything with new grease. We spent about 4 hours just to troubleshoot. The m
otor has an ingenious electromagnetic brake inside so when power is interru
pted, the motor/jackscrew rotation stops and it is held in place. Interesti
ngly, before we separated the motor from the jack screw housing, turning th
e armature by hand would not retract or extend the jack screw but turning t
he adapter on the jack screw housing did extend and retract the jack screw.
So it's pretty much narrowed it down to the motor itself. Being that the m
otor would not run initially when power was applied and took some unusual e
ffort to get it started, confidence is high the bearings are the issue. Che
cking the field coils with a meter showed good. Brushes were like new. Also
, being that the trim motor worked initially for departure but nothing from
there on, pretty much pointed to the trim motor. I had cycled several time
s on the ground and got the trim moving light so the aircraft system seems
to be good.
We didn't take any photos at that time cause we didn't know what we were lo
oking for but I will ask if he can when he puts back together. Basically, s
eparate the motor from the jack screw housing. Gently pull apart and you wi
ll see the electrobrake. In the end of the motor there is an insert that co
uples the motor to the brake. Remove it by pulling straight out to see the
front bearing. When we got the motor running, not at full rpm, you could se
e the ball bearings and some were turning at a different speed or not at al
l and you could see the armature just barely wobbling. There's only about 0
.020" clearance between the armature and field coils. You could hearing the
grinding of the bad bearings or possibly the armature hitting and feel the
vibration in the motor itself. The grease being 20+ years old and having n
o lubricity left, more than likely caused the bearings to fail and when pow
er was applied, allowed the armature to cock just enough to be out of align
ment with the field coil.
This is our theory but it seems to be validated by what we did but will kno
w more once we get the new bearings installed. I will post more later once
we get the new bearings installed, test the motor on the bench, and test in
the plane.=C2-
Tony
On Saturday, June 17, 2017 3:24 AM, Hartley Postlethwaite <hap1995@yaho
o.com> wrote:
Do you have any good pictures?=C2- This could be a good small comment to
put in the next Red Alert.=C2- Deadline is the end of this month for subm
issions.
Feel free to send me a PM.
Postal
RPA President
FlyingHartley@gmail.com
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 4
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| Subject: | Re: Stabilator Trim Motor |
If it works he is our new trim motor guy.
john cabrera
> On Jun 17, 2017, at 6:48 AM, Anthony Royal <skyking76t@verizon.net>
wrote:
>
> The tech still has the trim motor assy as he has to get the old
bearings out of the housing and order new bearings (metric you know) and
lubricate everything with new grease. We spent about 4 hours just to
troubleshoot. The motor has an ingenious electromagnetic brake inside so
when power is interrupted, the motor/jackscrew rotation stops and it is
held in place. Interestingly, before we separated the motor from the
jack screw housing, turning the armature by hand would not retract or
extend the jack screw but turning the adapter on the jack screw housing
did extend and retract the jack screw. So it's pretty much narrowed it
down to the motor itself. Being that the motor would not run initially
when power was applied and took some unusual effort to get it started,
confidence is high the bearings are the issue. Checking the field coils
with a meter showed good. Brushes were like new. Also, being that the
trim motor worked initially for departure but nothing from there on,
pretty much pointed to the trim motor. I had cycled several times on the
ground and got the trim moving light so the aircraft system seems to be
good.
>
> We didn't take any photos at that time cause we didn't know what we
were looking for but I will ask if he can when he puts back together.
Basically, separate the motor from the jack screw housing. Gently pull
apart and you will see the electrobrake. In the end of the motor there
is an insert that couples the motor to the brake. Remove it by pulling
straight out to see the front bearing. When we got the motor running,
not at full rpm, you could see the ball bearings and some were turning
at a different speed or not at all and you could see the armature just
barely wobbling. There's only about 0.020" clearance between the
armature and field coils. You could hearing the grinding of the bad
bearings or possibly the armature hitting and feel the vibration in the
motor itself. The grease being 20+ years old and having no lubricity
left, more than likely caused the bearings to fail and when power was
applied, allowed the armature to cock just enough to be out of alignment
with the field coil.
>
> This is our theory but it seems to be validated by what we did but
will know more once we get the new bearings installed. I will post more
later once we get the new bearings installed, test the motor on the
bench, and test in the plane.
>
> Tony
>
>
>
>
> On Saturday, June 17, 2017 3:24 AM, Hartley Postlethwaite
<hap1995@yahoo.com> wrote:
>
>
<hap1995@yahoo.com <mailto:hap1995@yahoo.com>>
>
> Do you have any good pictures? This could be a good small comment to
put in the next Red Alert. Deadline is the end of this month for
submissions.
>
> Feel free to send me a PM.
>
> Postal
> RPA President
> FlyingHartley@gmail.com <mailto:FlyingHartley@gmail.com>
>
> http://www.matronics.com/Navigsp; - MATRONICS WEB FORUMS -
> http://forum=C2- =C2- =C2- =C2- =C2- =C2- - NEW MATRONICS
LIST WIKI -
> http://wiki.matronics.com <http://forums.matronics.com/>
> http://www.matronics.com/c
>
>
>
>
>
Message 5
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| Subject: | Re: Stabilator Trim Motor |
I told him he might be going into a new business because trim motors seem t
o be a common problem with the L29
On Saturday, June 17, 2017 1:20 PM, John Cabrera <jetblast1@me.com> wro
te:
If it works he is our new trim motor guy.
john cabrera
On Jun 17, 2017, at 6:48 AM, Anthony Royal <skyking76t@verizon.net> wrote:
The tech still has the trim motor assy as he has to get the old bearings ou
t of the housing and order new bearings (metric you know) and lubricate eve
rything with new grease. We spent about 4 hours just to troubleshoot. The m
otor has an ingenious electromagnetic brake inside so when power is interru
pted, the motor/jackscrew rotation stops and it is held in place. Interesti
ngly, before we separated the motor from the jack screw housing, turning th
e armature by hand would not retract or extend the jack screw but turning t
he adapter on the jack screw housing did extend and retract the jack screw.
So it's pretty much narrowed it down to the motor itself. Being that the m
otor would not run initially when power was applied and took some unusual e
ffort to get it started, confidence is high the bearings are the issue. Che
cking the field coils with a meter showed good. Brushes were like new. Also
, being that the trim motor worked initially for departure but nothing from
there on, pretty much pointed to the trim motor. I had cycled several time
s on the ground and got the trim moving light so the aircraft system seems
to be good.
We didn't take any photos at that time cause we didn't know what we were lo
oking for but I will ask if he can when he puts back together. Basically, s
eparate the motor from the jack screw housing. Gently pull apart and you wi
ll see the electrobrake. In the end of the motor there is an insert that co
uples the motor to the brake. Remove it by pulling straight out to see the
front bearing. When we got the motor running, not at full rpm, you could se
e the ball bearings and some were turning at a different speed or not at al
l and you could see the armature just barely wobbling. There's only about 0
.020" clearance between the armature and field coils. You could hearing the
grinding of the bad bearings or possibly the armature hitting and feel the
vibration in the motor itself. The grease being 20+ years old and having n
o lubricity left, more than likely caused the bearings to fail and when pow
er was applied, allowed the armature to cock just enough to be out of align
ment with the field coil.
This is our theory but it seems to be validated by what we did but will kno
w more once we get the new bearings installed. I will post more later once
we get the new bearings installed, test the motor on the bench, and test in
the plane.=C2-
Tony
On Saturday, June 17, 2017 3:24 AM, Hartley Postlethwaite <hap1995@yaho
o.com> wrote:
Do you have any good pictures?=C2- This could be a good small comment to
put in the next Red Alert.=C2- Deadline is the end of this month for subm
issions.
Feel free to send me a PM.
Postal
RPA President
FlyingHartley@gmail.com
http://www.matronics.com/Navigsp; =C2- =C2- =C2- =C2- =C2- - MATR
ONICS WEB FORUMS -
http://forum=C2- =C2- =C2- =C2- =C2- =C2- - NEW MATRONICS LIST
WIKI -
http://wiki.matronics.com
http://www.matronics.com/c
Message 6
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| Subject: | Re: Stabilator Trim Motor |
We don=99t care how he did it. Just tell him to remember and make
sure you keep his contact info for us to ship ours.
Bill
> On Jun 17, 2017, at 15:14, Anthony Royal <skyking76t@verizon.net>
wrote:
>
> I told him he might be going into a new business because trim motors
seem to be a common problem with the L29
>
>
> On Saturday, June 17, 2017 1:20 PM, John Cabrera <jetblast1@me.com>
wrote:
>
>
> If it works he is our new trim motor guy.
>
> john cabrera
>
>
>
>> On Jun 17, 2017, at 6:48 AM, Anthony Royal <skyking76t@verizon.net
<mailto:skyking76t@verizon.net>> wrote:
>>
>> The tech still has the trim motor assy as he has to get the old
bearings out of the housing and order new bearings (metric you know) and
lubricate everything with new grease. We spent about 4 hours just to
troubleshoot. The motor has an ingenious electromagnetic brake inside so
when power is interrupted, the motor/jackscrew rotation stops and it is
held in place. Interestingly, before we separated the motor from the
jack screw housing, turning the armature by hand would not retract or
extend the jack screw but turning the adapter on the jack screw housing
did extend and retract the jack screw. So it's pretty much narrowed it
down to the motor itself. Being that the motor would not run initially
when power was applied and took some unusual effort to get it started,
confidence is high the bearings are the issue. Checking the field coils
with a meter showed good. Brushes were like new. Also, being that the
trim motor worked initially for departure but nothing from there on,
pretty much pointed to the trim motor. I had cycled several times on the
ground and got the trim moving light so the aircraft system seems to be
good.
>>
>> We didn't take any photos at that time cause we didn't know what we
were looking for but I will ask if he can when he puts back together.
Basically, separate the motor from the jack screw housing. Gently pull
apart and you will see the electrobrake. In the end of the motor there
is an insert that couples the motor to the brake. Remove it by pulling
straight out to see the front bearing. When we got the motor running,
not at full rpm, you could see the ball bearings and some were turning
at a different speed or not at all and you could see the armature just
barely wobbling. There's only about 0.020" clearance between the
armature and field coils. You could hearing the grinding of the bad
bearings or possibly the armature hitting and feel the vibration in the
motor itself. The grease being 20+ years old and having no lubricity
left, more than likely caused the bearings to fail and when power was
applied, allowed the armature to cock just enough to be out of alignment
with the field coil.
>>
>> This is our theory but it seems to be validated by what we did but
will know more once we get the new bearings installed. I will post more
later once we get the new bearings installed, test the motor on the
bench, and test in the plane.
>>
>> Tony
>>
>>
>>
>>
>> On Saturday, June 17, 2017 3:24 AM, Hartley Postlethwaite
<hap1995@yahoo.com <mailto:hap1995@yahoo.com>> wrote:
>>
>>
<hap1995@yahoo.com <mailto:hap1995@yahoo.com>>
>>
>> Do you have any good pictures? This could be a good small comment to
put in the next Red Alert. Deadline is the end of this month for
submissions.
>>
>> Feel free to send me a PM.
>>
>> Postal
>> RPA President
>> FlyingHartley@gmail.com <mailto:FlyingHartley@gmail.com>
>>
>> http://www.matronics.com/Navigsp <http://www.matronics.com/Navigsp>;
- MATRONICS WEB FORUMS -
>> http://forum=C2- =C2- =C2- =C2- =C2- =C2- - NEW MATRONICS
LIST WIKI -
>> http://wiki.matronics.com <http://forums.matronics.com/>
>> http://www.matronics.com/c <http://www.matronics.com/c>
>>
>>
>>
>>
>>
>
>
>
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