I used polythene sheet as a shim. It was of "medium" thickness; about
0.0025". On completion of the whole set-up the freedom of movement was
first-rate and with no axial play.
Until that is the bearing was oiled.
Oil/grease causes Tufnol to swell (by 0.6% during my subsequent
measurements). So my nice 0.0025" end-float closed up by 0.003"!
Its not so tight that it stick-slips, but it adds noticeably to overall
control friction.
Moral: use 0.005" polythene?
Duncan McFadyean
-----Original Message-----
From: Tony Renshaw <renshaw@ozemail.com.au>
Date: Tuesday, November 14, 2000 10:37 AM
Subject: Front Bearing setup
>Gidday,
>I am about to join the front flight control components either side of the
>front tufnol bearing and would like to see if anyone can suggest a setup
>that will ensure ideal spacing. The parts are the control fork(CS02) at the
>base of the control stick, the tufnol bearing(CS04), and the bush that
>passes through the tufnol bearing(CS03). The manual has you placing the
>bush vertically through the tufnol bearing and into the CS02 fork whilst
>the Redux cures. I have found that the face of CS02 that mates with the
>tufnol is not completely smooth and creates a "notchy" feeling when rotated
>backwards and forwards. This uneveness has been pollished out by placing
>both 800 and then 1200 Grit wet and dry onto a sheet of coffee table glass
>and polished out. Worked really well much to my surprise. I fear that too
>little tightness may give a sloppy mating either side of the tufnol bearing
>and too much tightness may be effected by temperature creating binding. It
>has been suggested that I pack out between the inner face of the bush(CS03)
>that mates with the tufnol bearing(CS04) with an ultra thin spacer such as
>a thin plastic medium, but what thickness, if at all?
>Any help or tips on this part of the flight control setup would be greatly
>appreciated.
>Reg
>Tony Renshaw
>Builder No.236
>Reg
>Tony Renshaw
>Builder No.236
>
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