130212

SBAU Telescope Workshop, February 12, 2013

Attendees:  TimC, JerryW, TomKing, Ed Kalinsky, Dmitrii Zagorodnov, Ray, TomT

JW-showing his mirror focus parameters for 14.5” modified Dall–Kirkham.

TK-JW helping check surface of TK quartz 12” mirror w/ spherometer and suggesting strokes to use in grinding w/ 120grit.  30Hrs spent so far; TK-continuing to grind at meeting and achieved the desired spherical surface tonight and will move on to 220 grit.  Mirror was bought preshaped. He is using a ceramic plate made by TomW.

TimC setting up for Demitri Ronchi test. D at spherical polishing stage.

-JK focusing and helping describe work needed. 

Ray 8” Orion dobsonian newtonian w/ modified focuser examined by TC/JW

-TC adjusting secondary, then primary to get red laser placed in focuser centered

JW describe differences btw pyrex (borosilicate), quartz (SiO2 crystal), plate glass for mirrors. Mt. Wilson mirror made from wind bottles.
Photos from meeting:

http://www.flickr.com/photos/27241501@N03/sets/72157632763859635/