On my Moose I scraped away the excess material until I had smooth movement.
I did this for both rudder tubes about 7/8" and elevator torque tubes about
2.0" diameter's. I did remove the paint from the steel tubes and polished
them with very very very fine emery cloth.
I used a single edge raiser blade to remove material where it was a bit too
thick, I feel that sanding would leave a rough surface, I wanted a "window
glass smooth surface". This was the same procedure my grandfather used back
in the days of early automobile engine repairs when it was necessary to pour
a Babbitt bearing then scrape away the excess material to have a proper oil
clearance on a crankshaft.
By doing it this way I did not have any fine slivers of delrin to cause
interference, or make a change in the friction at these bearings.
My manual insists NO LUBRICATION on the delrin
Dick Wampach SR-108 N331RW
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of Ken
Sent: Saturday, October 24, 2009 7:12 PM
To:
rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Derlin bearing block fit
I sanded off the paint and still had to sand the delrin blocks as well.
I don't believe the movement will wear looser in service but the Crown
brand silicone spray may help a little. Some of us also reinforced the
bottom of the horizontal bulkhead with a piece of stringer or angle left
to right. That is to keep the bulkhead from flexing down which may cause
some binding on the CC-68 delrin bearings when the rudder cables are
tensioned.
Ken
Joel Jacobs wrote:
Hi,
I've been working on the elevator controls where I'm mounting the
CC-68 in the RP-13 bearing blocks on the aft horizontal bulkhead. The
bearing blocks are a really tight fit. So, do I just enlarge the
holes in the bearings or should I start by removing the paint on the
CC-68 where it goes into the bearing. Does the paint wear off anyway?
I guess what I want to avoid is enlarging the bearing for a good fit
and then having the paint wear off and making the fit to loose. I'll
be having the same issue with the rudder pedals. Thanks much,
Joel
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