Re: [ATM] Pitch Substitute for very fast mirrors

[hermit <hermit@outofoptions.org>]

Kevin MIchael Zabbo wrote:
> Even that subdiameter lap has .0002" space between the
> high and low part of the contact area.  Heavy weight
> during figuring gives a rough surface.
>
> Also, silicone is a bit cheaper than pitch and doesn't
> form that stench that my wife hates.  She can deal
> with a little vinegar (foodlike) rather than
> turpentine burning.  Better a happy wife than a nice
> pitch lap?
>
>   
Thick pitch, heavy weight, slow speed gives me VERY smooth surfaces.   
The silicone isn't going to flow at all which may be a problem all by 
its self.  But, let us know how it works for you. 

Ken Lowther
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