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I'm no machinist (though I've played
one at my neighbor's Bridgeport to make a few bits for my rotary
install). I would have thought that setup would be centering the
plate's existing hole under the chuck (could be done with a
lathe-turned fixture, 1/2" for the chuck and the big end matching
the existing hole in the plate), then change to an end mill of the
washer OD to cut the depression. My idea would be to replace the
1mm washer with one the same thickness as the thicker ones (Bobby
said 3.5mm?), and mill the depression to end with the same stack
height. In this case, mill 2.5mm deep. The new stack would be
3.5/bearing/3.5/bearing/3.5, but 2.5 would be recessed into the
plate, leaving the same stack height from plate to snubber.
With access to a lathe & mill, the tool & tooling needed
shouldn't cost much more than the onesies price for Bobby's
oversize washer. As you mentioned, you still need some sort of
tooling/fixture to center the cup, so that should be a trade off.
Upside (assuming that Locktite stickum will hold a flat washer as
well as it can lock bearing races) is that once the depression is
milled, it becomes the tooling/fixture for future washer
replacement.
But it probably won't work; as I said, I'm no machinist and even
less engineer. :-)
Charlie
On 11/12/2018 2:48 PM, Neil Unger 12348ung@gmail.com wrote:
Charlie,
Sounds simple, but to cut the depression in
the plate accurately will take a lot of setup time. Then
whatever depression you cut will have to be added to the nylon
snubber washer and the whole gear train will be moved backwards
as well. Couls end up time consuming and very messy IMHO.
Neil.
Could the same effect be achieved
by milling a depression in the 1/2" plate? How thick are the
thicker washers; 2 mm? If so, mill a 1mm depression in the
plate, and replace the thin 1 mm washer with a 3rd 2 mm
washer. IIRC, Locktite makes a 'stickum' that could keep the
washer embedded in the plate, so it doesn't un-nest when the
shaft is unloaded. Would this excessively compromise the
strength of the plate?
Charlie
On 11/12/2018 7:10 AM, Bobby J. Hughes bhughes@qnsi.net
wrote:
Neil,
Looking
good. The cup ID may need to be a few thousands over
52mm so not sure if there’s room for a mounting spigot.
Depending on material thickness, the cup will fully
enclose one of the 2MM bearings and part of the 3.5mm
thrust washer. Possibly add oil path grooves to the
front and rear of the cup at 45 degree clocking.
Depending on the material thickness the channels may
need to be offset. Oil channels may not be necessary.
Too
early for wine but well caffeinated!
Bobby
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, November 12, 2018 2:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 1mm thrust washer
Kelly, I really should not draw freehand --- see if you
can make sense of the scribble. Neil.
Neil and All,
Not sure I am visualizing the
shape of the of the cup to encapsulate the
1mm thrust washer but would
certainly be a customer if Randy Kempf were
to gear up to produce
them........How about sketch of the proposed shape
for those of us that are somewhat
mechanically inept...........<:)
Bobby,
Sorry I misunderstood
you. By all means contact
Randy as he may be able to fit you in. He has a
complete reduction
drive of mine there to measure, and certainly has
the machinery to make
same.
Neil.
On 11/12/2018 7:41 AM, Bobby J. Hughes bhughes@qnsi.net
wrote:
> Neil
>
> I was asking if Randy would consider making
the 1mm washer mounting cup. I have a chip
detector but removed it due to the 1mm washer /
shaft wear creating fuzz every few hours and
setting off an alert. I also measure the gearbox
oil temp output.
>
> Bobby
>
> Sent from my iPad
>
>> On Nov 11, 2018, at 3:15 PM, Neil Unger 12348ung@gmail.com
<flyrotary@lancaironline.net>
wrote:
>>
>> Bobby,
>>
>> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
 Another way is what I did, was to put a temp
sensor in the pSRU which will let you know if all
is not well with elevated temps. This is
standard in heavy trucks, One in the gear box,
and one each in both diffs. Simple and
effective.
>>
>> Neil.
>>
>>
>>> On 11/12/2018 6:58 AM, Neil Unger
wrote:
>>> Bobby,
>>>
>>> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
  I put a magnet in the return line to catch
any metal, but only got the "fuzz" you are talking
about so simply removed it.
>>>
>>> Will discuss with Randy re stocking a
chip detector. That will be his commercial
decision.
>>>
>>> Neil.
>>>
>>>
>>>> On 11/12/2018 3:29 AM, Bobby J.
Hughes bhughes@qnsi.net
wrote:
>>>> Neil,
>>>>
>>>> That should work. I believe Tracy
has suggested the same solution. It would allow
for replacing the 1mm washer if needed. I’m
thinking aluminum instead of steel to minimize any
wear on the washer outer edge if it rotated. I
would like to start using my gearbox chip detector
again. The 1mm washer shaft contact caused enough
fuzz to activate it every few hours so I removed
it. Would this be an item Randy Kempf would
consider supplying? We need four in Austin TX and
I’m sure others would retrofit if the part was
available. The cup OD would need to increased
but I think we have plenty of room to accommodate
modification.
>>>>
>>>> Thanks,
>>>> Bobby
>>>>
>>>> Sent from my iPad
>>>>
>>>>> On Nov 10, 2018, at 4:01 PM,
Neil Unger 12348ung@gmail.com
<flyrotary@lancaironline.net>
wrote:
>>>>>
>>>>> Bobby,
>>>>>
>>>>> Â Â Â Â Â Â Â Â Â Â
         Tried my bearing
blokes with no joy, over that size they are all
1.5mm. There is another way however if there
is room. I suggest a small alloy (or steel)
"cup" with mounting flanges like the washer you
want, except in the middle the 1mm washer fits
flat against the mounting plate as usual, and the
cup then tapers upwards (after the 1mm thick
retaining hole at the bottom ) and out slightly
(for say another 3mm?) to prevent the 1mm thrust
washer to "jump out of bed" and moving sideways.
If it does move forward the taper will force it
back into place when the load comes on again.ÂÂ
My $0.02 worth,
>>>>>
>>>>> Neil.
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