Re: [ATM] keep polishing or return to fine grinding?

[hermit <hermit@outofoptions.org>]

Kirk Brown wrote:

>I'm working on my first mirror, an 8" f/6. I'm having trouble getting the
>edge to polish out, or for that matter, to polish at all (after 6 hrs). The
>rest of the mirror looks great. I performed several warm and cold presses,
>but they do not seem to help. The region in question is the last 0.5".
>
>Second, I'm convinced that my lap was too hard (Gugolz #73) for working
>indoors ( 72-75 F) as it constantly slipped and grabbed no matter how many
>cold presses I did. I just ordered some Gugolz #64 to try out. I am hoping
>this was a good call.
>
>Third, should I return to 18 or 9 micron AlOx to ensure I have a good shape?
>I did this once before to remove several scratches, but maybe I ruined the
>shape?
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>  
>
1/3 stroke is 1.3 inch overhang  when you do a stroke, not 2.6.  If you 
stroke was too long you could have turned the edge.

Ken
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