Re: ATM A question, if I may?

[Brian Nestel <blast@aloha.net>]

"Slc.Dennis Bishop" wrote:

> 
> I removed the mirror cell today to put a spot at the center for =
> collimation purposes. I noticed that the mirror is held in place with =
> three, L shaped rubber clamps (one was so loose it was rattling!). How =
> tight should I tighten the clamp screws? I don't want to distort the =
> mirror (about 1 inch thick), but I don't want it to move around too much =
> either.
Hi:
You want to have the clamps just touching the edge of the mirror, but not 
with pressure, if set right there should be no lateral and forward movement 
of the mirror,  you did not say what type of mount the mirror is in, if in 
a dob, mirror shift will be minimal as the mirror will rest in the approx
the same plane most of the time and you are just concerned with safety
of the mirror, if in a equatorial mount you want no shifting of the mirror
as it will be in different positions and can cause slight changes in 
collimation at high powers and or if you are doing photography or 
CCD imaging.
-- 
Aloha   159 30 W, 21 55 N
Brian   Middle of the Pacific,
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