RE:ATM telescope making books

[tkrajci@san.osd.mil]

>From: hermit <hermit@outofoptions.com>

>... think the books are great. But that is
>me. 
>While some of us may argue the information is out dated, especially with
>regards to mirror cells, the methods are generally proven to work.  

This is an area where I look forward to the next ATM book that addresses  
more advanced concepts...mirror support, mirror cells, various approaches, 
etc.  What has been written will work for not-too-thin mirrors and not-
very-large mirrors, but many mirror cells made for big amateur scopes 
require the user to jostle/bump/nudge the cell to help things 'settle' 
from time to time.  That is a sure sign of stiction...something that we 
don't want in mirror cells.  

Compliant hinges are one way to solve the stiction problem.
See:
http://overton.tamu.edu/aset/krajci/
specifically:
http://overton.tamu.edu/aset/krajci/scope-design.htm (very bottom of page)
http://overton.tamu.edu/aset/krajci/cell-bearing.htm

Tom Krajci
Tashkent, Uzbekistan