From: "Tom Krajci" 
To: 
Reply-To: "Tom Krajci" 


>From: Bill Marriott 

>I am a strong advocate of replacing pitch laps, if there are figuring
>problems as you finish polishing out, so as you clean things up, the
new
>lap can break in, yet still be soft and pliable for following the
>parabola to its finish.

>...However, we have lots of pitch and advice available, so its easy for
us
>to say that, if  you do not have easy acess to pitch, then that's
>another story.

Search the archives for posts I made in 1996-1998.  I used one lap to
polish and figure multiple (four?...ten?) mirrors.  I did nothing unusual
in the size/thickness/type of polishing tool.

Scratching or wire brushing the surface can help a great deal, and avoids
the need to make a totally new lap.

I used hard pitch.  After I figured out what temperature my particular
pitch needed...I had smooth figures and little problem with turned edges.

Good luck,
Tom Krajci
Tashkent, Uzbekistan

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