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Subject: [M]: How much misalignment causes bearing wear?
From: Mark Simpson
Reply To: mapug@shore.net
Date: Thu Jul 19 14:09:33 2001
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This is a question for the people out there who've had Dec bearing
problems, or have
upgraded to the metal bearings. Also if you're a machinist, knowledge is
welcome.
How much can the misalignment of the forks contribute to bearing wear?
(I'm ignoring the
effect on the goto pointing).
I.E. Say the right fork was misplaced by 4 mm's, would that cause
significant bearing wear?
Calculating it out on a 10 inch LX200 (say 35cm's between the DEC
bearings), then
using some trig to work out the angle the bearing is misplaced by I get.
Misplacement= Sin(-1) (4/350)
Which is 0.655 degrees. I.E. the stress on the bearing is being caused by
the OTA not being
exactly at right angles to the fork by 0.655 degrees.
The way I'm thinking, I figure that much strain on a bearing that's
probably only 2cm in length, is only about
0.22mm end to end. How accurate are Meades tolerances in drilling bearings
holes accurate anyhow?
What is the precision and tolerances of the DEC bearings?
Regards
Mark Simpson
--
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This is a question for the people out there who've had Dec bearing problems,
or have
<br>upgraded to the metal bearings. Also if you're a machinist, knowledge
is welcome.
<p>How much can the misalignment of the forks contribute to bearing wear?
(I'm ignoring the
<br>effect on the goto pointing).
<p>I.E. Say the right fork was misplaced by 4 mm's, would that cause significant
bearing wear?
<p>Calculating it out on a 10 inch LX200 (say 35cm's between the DEC bearings),
then
<br>using some trig to work out the angle the bearing is misplaced by I get.
<br>
<br>Misplacement= Sin(-1) (4/350)
<p>Which is 0.655 degrees. I.E. the stress on the bearing is being
caused by the OTA not being
<br>exactly at right angles to the fork by 0.655 degrees.
<p>The way I'm thinking, I figure that much strain on a bearing that's
probably only 2cm in length, is only about
<br>0.22mm end to end. How accurate are Meades tolerances in drilling
bearings holes accurate anyhow?
<p>What is the precision and tolerances of the DEC bearings?
<p>Regards
<br>Mark Simpson
<pre>--
Receive free alerts for the Northern Lights at your location!
See the newest photos!
<A HREF="http://www.bowfort.com/~adec/">http://www.bowfort.com/~adec/</A>
ADEC</pre>
</html>
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