On Tue, 16 Dec 1997, Tony Renshaw wrote:
> Steve,
> The Teflon tubing you used, was it the stock I gave details of in terms of
> the numbers on the spool?
> My trial test required a fair bit of effort to pull the teflon through and
> you wouldn't be able to get it through without slitting it first. Did you
> use the installation method recommended in the Canard Pusher?
> Reg
> Tony Renshaw
The salesman you mentioned wasn't available so they gave me someone
else. I just gave them the part number not the numbers on the spool. I
probably got the wrong stuff since everything was an easy fit, no need to
slit the tubing. Will call them tomorrow for some more tubing. I am
glad to here that I probably got the wrong stuff as I was rather
disappointed with the play after inserting the tubing. Will let you know
what I find out.
Thanks,
Steve Eberhart
>
> >I am building a wing section for wind tunnel testing in the University of
> >Illinois low speed wind tunnel. It is 18" chord by 34" span with a 20%
> >chord aileron. I used standard aluminum piano hinge for the aileron hinge
> >and was not satisfied with the amount of play in the new piano hinge
> >(purchased from Wicks Aircraft). After seeing the posts about the
> >teflon/stainless hinge pin modification I thought I had found the answer
> >to the play in my hinge. I ordered the teflon tubing and bought a pound
> >of stainless welding rod. These are the dimensions of the materials:
> >
> >original hinge pin .084"
> >
> >stainless welding rod .061"
> >
> >dia hole in hinge > .091" could only check with piece of brass tubing
> > as I don't have a set of drills to verify
> > diameter.
> >
> >stainless rod with
> >teflon sleve .091" but would compress to .084"
> >
> >
> >The stainless rod easily slid into the teflon sleve and the sleve/rod
> >assembly easily slid into the hinge. There was still slop in the hinge
> >after inserting the teflon/stainless rod due to the assembly being able
> >to compress to .084" but it was a smoother operating hinge. It would
> >seem that the modification would help prevent new hinges from wearing but
> >I don't know about using it to repair a worn hinge. Would seem that a
> >thicker wall teflon tubing would be required. I am on the look out for
> >such teflon tubing. If anyone finds any please let me know.
> >
> >A 100 ft. of teflon tubing from McMaster-Carr was $14.00 USD and a pound
> >of welding rod was $14.00 USD.
> >
> >Steve Eberhart
> >newtech@newtech.com
> >
> >
>
>
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