Re: [ATM] Re:Tees instead of triangles

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

Alan K. Henderson wrote:
> This whole topic may be moot (for me, anyway). I received an email
> suggesting that my mirror is so thick that a 6-point cell will
> suffice. The chart on this site states that a slightly smaller and
> thinner mirror (16" diameter, 3" thick) has a P-V of 1/53. My 16.5
> x 3.5 won't be far from that.
> 
> http://users.telerama.com/~mdholm/atm/cells/6point.html

I used a 6-point cell on my 16" F/4, 1.625" thick (Pyrex).  I have 
seen no hints of support problems in star tests, so I believe it is 
working quite well.  Three teeter-totters are easy to make.

A 3" thick mirror should be no problem at all.  You'll have much 
bigger problems with thermal issues.

	Mike Lockwood


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