[ATM] Recent Robo-Glass mill results

["James Lerch" <jlerch1@tampabay.rr.com>]

Greetings All,

I've been putting the glass mill to work lately, and just wanted to share a few
things I've learned:

#1 Cheap diamond blades are not cost effective.  Their diamond content is
lacking when compared to 'expensive' diamond blades.

#2 Continuous rim blades definitely give a better cut.

#3 Its important to keep changing the RPM of the turntable based on the current
radius of the cutting blade.  So far, best results occur at 6 inches of
circumference past the cutter per second.  Any more and I start to get chatter,
any less and it just takes longer to generate the shape.

Here are some pictures of some recent results:

#1 Three 10" plate glass tools, convex generated in 25mins each. (+7 mins to cut
each disk from square stock)  Also note improved surface condition as I played
with cutting speed.

http://lerch.no-ip.com/atm/Projects/Glass_Work/10_inch_tools/page_01.htm


#2 A 10" diameter, 1.63" thick Pyrex, generated to F/4.8, and a plate glass
tool.

http://lerch.no-ip.com/atm/Projects/Glass_Work/10_Concave/page_01.htm


#3 A 16" diameter, 1" thick Pyrex, generated to F4.5 concave in one hour:  (Last
three images show the result of a single wet of 120 grit, tool on top, worked by
hand just to see what would happen.)

http://lerch.no-ip.com/atm/Projects/Glass_Work/16_Concave/page_01.htm


Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)

"Anything that can happen, will happen" -Stephen Pollock from:
"Particle Physics for Non-Physicists: A Tour of the Microcosmos"

" Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent. "
                                                           Calvin Coolidge

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