Re: [ATM] Mirror Cells - Springs vs. Push/Pull

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

>I was wondering if there was any comments on using collimation pull bolts
opposed

>by springs (which seems to be the predominate method) vs. using push/pull
bolt

 >pairs like refractor cells use.



I use an alternative to springs or push/pull bolt pairs to support and allow
for collimation of my moving mirror focuser mirror assembly. My method uses
three 3/8-24 SS rods in which a flexural U joint has been machined into
each. The machined U joint allows for a small tip-tilt in each rod, but with
axial rigidity, no backlash and no stiction as would be found with a
spherical joint. Instead of push pull bolts each single rod has a captured
nut mounted in a housing anchored to the rear plate. By turning only the
nut, each rod moves in-out collimating the focuser mirror assembly. The
housings and captured nuts are both split and can be locked or tightened by
the same lock bolt. The locking bolt tightens both the nut against  the
housing and the nut against the threads making for absolute rigidity after
locking.  Collimation and locking are independent functions.



Don Clement

Running Springs, California

http://www.ClementFocuser.com

_______________________________________________
ATM mailing list http://www.atmlist.net/