Hello Willie
"> 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?"
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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