Today's Message Index:
----------------------
1. 03:36 AM - Re: heat probe (bobnoffs)
2. 07:54 AM - Re: Re: heat probe (Robert L. Nuckolls, III)
3. 09:22 AM - Re: Re: heat probe (Bill Allen)
4. 10:00 AM - Re: Re: heat probe (C&K)
5. 04:36 PM - Re: heat probe (bobnoffs)
Message 1
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the chip detecter looks like a good idea but i don't have a place to mount it.
it is way over my head to drill and tap a hole in the gearbox case.
maybe down the road it would be a job for someone competent when it is inspected.
bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499444#499444
Message 2
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At 05:31 AM 11/20/2020, you wrote:
>
>the chip detecter looks like a good idea but i don't have a place to
>mount it. it is way over my head to drill and tap a hole in the gearbox case.
> maybe down the road it would be a job for someone competent when
> it is inspected.
>
Adding a pipe-thread hole in the casting is
probably the easiest of tasks. Straight thread
taps are not 'self aligning' and it's too easy
to have your tap start cutting on a slightly
axially mis-aligned orientation. Pipe threads are tapered
and they start cutting with a minimum of attention
to position and force . . . you can concentrate
on axial alignment and the tap takes care of the
rest.
This thread begs some questions:
Is this a flooded, pressurize gearbox?
Fed with engine oil?
Are there any instances of field failures due
to degraded gearing?
Were these judged to be conditions long-in-the-
making that MIGHT have telegraphed impending
failure by increased temperature, metal
chips in oil, noise, etc?
What are the recommendations of the manufacturer
for monitoring gear box condition?
If it is judged that addition of any sensors
by penetrating the gearbox case is a good thing
to do, where is the best place for locating
those sensors. There will be optimum locations
after consideration of structural issues, temperature
gradients, optimal chip-congregation points, etc.
If this box is lubricated with circulated engine
oil, then I'm skeptical of the value of adding
any single temperature sensor. You've got hot
oil coming in. You'll want to know TEMPERATURE
RISE attributable to gear box wear.
What is the experience of the user community
with respect to this topic? It naturally seems
like a cool thing to add such sensors but
before you venture forth, it would pay to know
if such sensors are KNOWN to be effective along
with protocols for interpreting what a temperature
gage is telling you.
I seem to recall a similar discussion many moons
ago on another forum . . . perhaps Compuserv AVSIG
. . . wherein a reader suggested that the best
harbinger of impending gearbox doom was a dial
indicator he could firmly affix to some part
of the airplane to measure backlash in the gearing.
The observed number would rise noticeably long
before the gearbox trashed.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 3
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Most chip detectors fit where the drain plug goes. You can get them from
salvage yards where they break helicopters. That=99s where I got mine
.
On Fri, 20 Nov 2020 at 11:42, bobnoffs <icubob@gmail.com> wrote:
>
> the chip detecter looks like a good idea but i don't have a place to moun
t
> it. it is way over my head to drill and tap a hole in the gearbox case.
> maybe down the road it would be a job for someone competent when it is
> inspected.
> bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=499444#499444
>
>
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Message 4
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A few folks have made their own chip detector. A pair of metal probes
with a magnet epoxied into a pipe plug. Where possible expose it to oil
flowing in a line going to a filter. It's important to catch bearing
failures before they progress too far and periodic oil and filter
changes may not be frequent enough.
Ken
On 20/11/2020 11:47 AM, Bill Allen wrote:
> Most chip detectors fit where the drain plug goes. You can get them
> from salvage yards where they break helicopters. Thats where I got mine.
>
> On Fri, 20 Nov 2020 at 11:42, bobnoffs <icubob@gmail.com
> <mailto:icubob@gmail.com>> wrote:
>
> <icubob@gmail.com <mailto:icubob@gmail.com>>
>
> the chip detecter looks like a good idea but i don't have a place
> to mount it. it is way over my head to drill and tap a hole in the
> gearbox case.
> maybe down the road it would be a job for someone competent when
> it is inspected.
> bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=499444#499444
>
>
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Message 5
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I admit adding a chip detector is a stretch but I think a temp probe could be valuable.
You are not looking for absolute temp but a trend compared to engine
oil temp.
If I had a gearbox with a hx of failure I would probably be looking for another
gearbox. Kind of like having an engine oil analysis. Maybe I will see something
coming
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499457#499457
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