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willie.harrison(at)tinyon
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 Posted: Sun Jun 24, 2007 2:50 am Post subject: Pin interferece |
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For what its worth, my inspector, Tony Kay, tells me he suspects that the torque tubes supplied have a variable degree of heat treatment, leading to some folk experiencing more "wear" in the holes than others. I don't think he has hard data to back his suspicions, only the observation that some torque tubes do better than other. Anyone else have views or info on this?
Willie
On 24 Jun 2007, at 11:14, Duncan & Ami McFadyean wrote:
[quote]Hi all, Remi,
I'm not sure about that.
I had to replace my outer TP pins at 15 hours.
300++ hours later they are still OK, despite operating mostly from grass strips.
In my opinion, the pins are very accurately made. But the holes in the TP tubes are not. My new pins were set-up so that they had to be driven in; I suspect this makes the difference. The PFA requirement is now for an "interference" fit.
Duncan McF.
[b]
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rparigor(at)suffolk.lib.n
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| Posted: Sun Jun 24, 2007 11:13 am Post subject: Pin interferece |
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Hello Willie
"> For what its worth, my inspector, Tony Kay, tells me he suspects that
| Quote: | the torque tubes supplied have a variable degree of heat treatment,
leading to some folk experiencing more "wear" in the holes than
others. I don't think he has hard data to back his suspicions, only
the observation that some torque tubes do better than other. Anyone
else have views or info on this?"
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Making a round hole with walls that are flat is not a trivial job. I
reamed my holes holding parts in a fixture on my Milling Machine. I used
plenty of cutting fluid, and a few reamers where the last one was very
close in size where it only took a few thousands cut.
If you were to measure this now what you think is the perfect hole and
made a pin to fit, you would be dissapointed (as was I).
I turned some mini pins growing in size ~ .0001" and forced them in place
in growing incrments till a light tap wass needed. In every case to hole
would grow in diameter! Some as much as .0006" , some as little as 1 or 2
tenths. Now I used my precision pins to measure holes and make pins to
fit.
Search Ron Parigoris torque tube for a prior post.
You need to make holes at worst the same size entrance and exit and
dogbone pin, but better to make entrance hole a slight bit larger (a
thousand or 2), this way there will be no wear on the first hole dragginfg
a full length pin through it.
416SS is pretty easy to cut, and using double sticky tape on a flat G-10
or popsicle stick with wet/dry sandpaper to hand lap works great.
Ron Parigoris
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