Re: [ATM] Mak-Cass OTA mechanical design

["Don Clement" <clement.focuser@verizon.net>]

> Without glass to glue a paper hole reinforcer at the center spot it would
be
> difficult to use the standard methods of collimation for a Newtonian
> telescope.  How would one collimate the conical mirrors mounted with a
> center stalk?





The coaxial collimator
http://groups.yahoo.com/group/atm_free/files/Coax%20Collimator/

is one method that allows a conical or ribbed mirror, supported on a center
stalk to be collimated. The mirror is attached to the center stalk or
arbor/baffle using RTV in the gap between the glass and arbor. Also two flat
cork washers separate mirror from mounting. Silicone rubber O rings could be
used in place of cork washers. The coaxial collimator was designed to mount
to bottom triangular plate of the Clement moving mirror compliant focuser.
However, the mirror could just as well be mounted on a triangular plate with
central arbor/baffle in the same way, if one did not want to use a moving
mirror focuser, so as to retain optimal cassigrain primary secondary spacing
and retain minimal aberrations. I have installed the coaxial collimator in
MCTs &  SCTs with excellent results.



Don Clement

Running Springs, California

http://www.clementfocuser.com




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