Re: ATM 5 Micron or not 5 Micron?

[Ken Lowther <s0109366@cc.ysu.edu>]

On Thu, 31 Jul 1997, Bill & Tracy Marriott wrote:

> Mike Coslo wrote:
> > 
> >     I am almost finished with the fine grinding phase of a 12.5
> > inch pyrex mirror.(my first) Everything is going well. I just
> > finished the 9 micron wets, and I understand there is some
> > contention regarding going to 5 micron or starting with the
> > polishing stage after 9 microns.
> 
> > 
> >1)  Will skipping 5 micron wets add appreciably to the
> >    polishing times?
> 
> If you can successfully pull off a good 5u grind, without scratching,
> and polishing out your 12.5" by hand, you may save a couple or more
> hours of ooomph time, and you'll have to put a lot of time into
> polishing anyway....
> > 

You might consider using a piece of embossed plastic or fabric over you
tool.  This will also give a flash polish.  I know Howard mentions this
and some of the alternatives to pitch.  Silk is one that comes to mind,
paper is another.  I thought I would try this with my next mirror.  You
have to be careful about rips in the plastic or fiber.  This can lead to
scratching also.

Ken Lowther  
s0109366@cc.ysu.edu
Youngstown, Ohio  USA