Re: [ATM] smoothing the surface strange ronchi

[johncdeitz@comcast.net]

Hello Tom: Just proceed with a normal stroke until the surface is smooth enough and then check and correct. 
John
 -------------- Original message ----------------------
From: newsforfred@comcast.net
> greetings list
> 
> I have been polishing this mirror (4 inch f12) for some time with a tool 
> from a previous mirror (4 inch f5). The mirror polished out well but I 
> could not figure the mirror to a sphere. So I took the tool from this 
> mirror and poured a new lap and was able to produce a good figure. 
> 
> Now after some tome testing it looks to be a bit rough and needs to be 
> polished slower to smooth the surface. So my question is what stroke to 
> proceed with? the mirror is fully  parabolic with under corrected edge 
> and center.
> 
> My thinking is to go back to a sphere working tool on top?
>  
> while doing some test with a ronchi grating we notice some times the 
> lines would converge and almost totally blur out each other. could any 
> one try to explain this.
> 
> thanks
> Tom
> 
> 
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