From: "mommoteandcoyote" 
To: 
Reply-To: "mommoteandcoyote" 


Richard wrote:

What kind of grinding tool do you normally use?   Solid glass, by any
chance?

No, not exclusively...depends on what I'm grinding.  Have used solids,
diamond cut channeled solids, cemented tile and glass segments on glass,
concrete, even dental stone, ( don't care much for dental stone, or wood or
plaster of Paris).  All that said,  whether it be making the decision to
move to a finer grade of abrasive, or whether you are needing to know if
its time to start figuring,  if the edge says it's ready... It's ready!

Coyot‚



----- Original Message -----
From: "Richrad" 
To: "mommoteandcoyote" 
Sent: Monday, February 03, 2003 9:15 AM Subject: Re: ATM polished surface quality


> What kind of grinding tool do you normally use?   Solid glass, by any
> chance?   I used solid glass grinding tools 30 years ago and had exactly
the
> experience you describe: the edge is the last to be ground and the last to
> be polished.   I don't use such primitive methods any more, and now my
> grinding and polishing is a lot more uniform.
>
>
> ----- Original Message -----
> From: "mommoteandcoyote" 
> To: "Steve Fejes" 
> Cc: 
> Sent: Sunday, February 02, 2003 11:51 AM
> Subject: Re: ATM polished surface quality
>
>
> >
> > Steve,
> >
> > Bill is exactly correct!  There is no substitute for 0/0 pits /
scratches,
> > and plenty of elbow grease. Watch the outside inch or so to the edge.  I
> use
> > a focusing pin light and a 10x loupe in a darkroom.  the center zones
will
> > polish out rapidly unless you are doing something wrong and contact
isn't
> > being maintained.  Spend the time pressing and polishing, and you will
end
> > up with a perfect polish upon which to figure.
> >
> > Coyot‚
> >
> >
> > ----- Original Message -----
> > From: "Bill T." 
> > To: 
> > Sent: Sunday, February 02, 2003 11:21 AM
> > Subject: Re: ATM polished surface quality
> >
> >
> > >
> > > Good scratch-dig reference:
> > >
> > > http://www.novaphase.com/Quote%20Guide.pdf
> > >
> > > BTW a dig of "40" is probably not adequate for
magnifying optics.
> > >
> > > A more ATM accessible test for completeness of polishing is the
focused
> > > flashlight test.  If the focused caustic of a strong flashlight passes
> > > unseen through *every part* of the surface of a mirror, then it's
> probably
> > > polished enough.  A harder test is the focused solar caustic.  In any
> > case,
> > > be sure to scrutinize the very edge of the mirror which is typically
the
> > > last part to fully polish out, and the least well ground.  That's
> usually
> > > where the biggest digs are.
> > >
> > > Bill T.
> > >
> > >
> > >
> > > _________________________________________________________________
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> > >
> > >
> >
> >
> >
>
>

--- BBBS/NT v4.00 MP