A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Home Built
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

what is this mystery pratt and whitney tool?



 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #9  
Old October 9th 09, 07:02 AM posted to rec.aviation.homebuilt
Dan[_12_]
external usenet poster
 
Posts: 451
Default what is this mystery pratt and whitney tool?

Bill Noble wrote:

"Dan" wrote in message
...
Bill Noble wrote:

"Dan" wrote in message
...
Bill Noble wrote:

"Flash" wrote in message
...

"Bill Noble" wrote in message
...
I originally posted this in the metal working newsgroup, some
folks there thought the part might be recobnized by somone here -
so, it's worth a try - any clues?

thanks:



I think this is probably quite old, but so far I have no idea
what it is (or
was part of) - there is another like it that has been sharpened
to use as a
boring bar - clearly that was not its original purpose. the one
pictured in
the drop box appears to be original - but orignal what, is the
question.

here are the links to the drop box:
http://metalworking.com/Dropbox/P-W-1.JPG
http://metalworking.com/Dropbox/P-W-2.JPG
http://metalworking.com/Dropbox/P-W-1.txt

Anyone got any clues about this item?

The text file from the drop box is reproduced below:

Mystery Pratt & Whitney tool - the cylindrical shank is exactly
.500 inches,
it says on the

shank, the following:

NO. 32
HS.-36
E-12

P&W
MFD CT
Made in USA

it is NOT a drill bit. The part that extends beyond the 1/2 inch
diameter
shows a wear line

like it was riding in a keyway. The point seems to be lathe
turned, the 1/2
inch shank

appears to be ground
Bill -
www.wbnoble.com


--
Bill -
www.wbnoble.com

My first guess would be some sort of gagueing equipment. I have
run across quite a few truly odd P&W gages and accessories for
gage sets. They were willing to make some very specialized gages
for a lot of unique applications.

Flash


Yes, I would agree, though I think it is not a specialty item -
maybe part of something to measure camshafts and the like? I'd
love to find someone who could say for sure what it was


Specialized boring bar? The 1/2" round end reminds me of my
boring bars, but I have never seen a cutting end like this thing
has. I suppose it could be installed in a boring head and used to
cut a groove beyond the reach of standard lathe tools. I'm probably
way off, but I can't think of anything else.

Dan, U.S. Air Force, retired

plausible, barely - but this thing is NOT sharp, I don't think it's
intended to cut anything -



It was the best I could come up with I hope you find out what it
is and tell us.

Over the years I have seen many specialized tools that no one
outside the trade could guess what they are for. Somewhere in my
scrounge I have a tool for shaping the points on the end of wagon
spokes. It's good for nothing else.

Dan, U.S. Air Force, retired


I've written Pratt and Whitney - we shall see if they have an answer -
meanwhile, here is my latest "brilliant" speculation - the ground part
is quite accurately ground to 1/2 inch - I just noticed that the flat
part is tapered in width, it is .194 near the pointy end, and .144 right
next to the ground round part. Further, the width of the flat part
(until the very end where it is much wider) is .565. So, if you now
imagine that this tool is slid into a 1/2 inch hole which has a keyway
broached in it that is deeper than 65 thousandths, then the thing will
enter the hole farther as the keyway gets wider - so that would make it
a tool for measuring the width of keyways.

Now, if my speculation were true, the ground 1/2 inch part would be just
under 1/2 inch so it would be a sliding fit - so I got out my best
measuring tool, an SPI digital micrometer that claims .00005 inch
accuracy and I measured it - sure enough,. 0.49950 - so it is 1/2
thousandth undersize.

This site shows some keyway width gauges
http://www.jayeshentp.com/products.htm which don't look like this at all

There is possible wear on the part that extends farther - it is .695
inches in diameter - and it goes from .18360 to .19220 - which nicely
spans 3/16 (.1875).

Ya think this could be it?



Just for giggles you might want to check your calibration/instruction
sheet for your mike. Taken out to that many places it's only accurate at
one specific temperature.

The more I look at this thing the more it looks like an eccentric
wood boring spade bit.

Then again, I have known people who would expend a lot of energy
making such a thing as a joke. When I flew RC in the 1970s I would carry
a prop wrench that wouldn't fit any nut known to man. I was always
willing to loan it at the field. I got the idea from an article in RCM
magazine.

Dan, U.S. Air Force, retired
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange 747/Pratt & Whitney project Ricky Piloting 14 February 1st 09 11:24 PM
PRATT & WHITNEY PROPOSES F-22A ENGINE VARIANT FOR LONG-RANGE STRIKE Mike[_7_] Naval Aviation 0 May 30th 07 02:44 PM
Was the Pratt & Whitney Double Wasp the best engine of WW II? Dave Kearton Aviation Photos 18 January 12th 07 07:20 PM
Question Pratt & Whitney Tool ... joseph Restoration 0 October 1st 05 02:57 PM
World War Two Era U.S. Radial Engines (Curtiss and Pratt&Whitney) Lincoln Brown Military Aviation 10 February 13th 04 04:30 AM


All times are GMT +1. The time now is 05:23 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 AviationBanter.
The comments are property of their posters.