Re: [ATM] industrial polishing pads?

["Bob May" <rmay@nethere.com>]

There are a lot of different pads out there.  Some are foram
backed while others are not.  I use pads often on first polishing
to get a quick polish on the surface but they don't do all that
well for getting the nice parabola as they don't move in
thickness like pitch does.
Pads are meant to be used fast which is directly contrary to what
pitch does so the speed of the mirror acroas the pads is part of
why they polish so fast.  Since the pads are rigid you don't have
to worry about getting a hyperboloid surface or something other
like thta but if you are regular in your motions, you will get
zones on the surface.
Personaly, I prefer the faster acting pads which are a bit
roughter than the finishing pads as I am purely interested in
getting the pitsout of the surface rather than getting a perfect
smooth surface with no zoneing.
Please not that there are pads of glass and for plastic.  The
plastic pads don't work as well for glass and really shouldn't be
used for glass.  I'll also note that it is quite easy to overload
a pad with CeO and that makes it slow down in its action.
Bob May

rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net


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