Re: [ATM] A bit of hand polishing advice please................

["Mitch" <funnybone101@earthlink.net>]

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Mark Holm
Sent: Wednesday, November 22, 2006 9:22 PM
To: 'Amateur Telescope Makers'
Subject: Re: [ATM] A bit of hand polishing advice please................

At least once, the microfacetting trick (nylon mesh pressed into the lap
surface) helped me overcome both uneven movement and dog biscuit.  I
think the pitch was just too hard for the temperature I was using it in
and I had trouble getting and maintaining good contact.  Meshing helped,
probably by lowering the effective hardness of the pitch.

-- 
Mark Holm
mdholm@telerama.com

     Along with proper pressing, micro faceting with nylon window screen
helped a lot. I usually warm my lap, just slightly. Throw on say 40-50 lbs
for about a minute. Then reduce it to about 30 for four more minutes for a
total of five, then let them press with 5 lbs for about 15-30 minutes while
the mirror and tool become the same temperature. (Be sure if hot pressing
you let the tool cool fully, especially if figuring!)

The Micro-faceting helps quite a bit. The first time you do it, at least for
me, I was amazed at the increase of drag, and the smoothness of it also.

Mitch

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