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Scott Milligan
super member
Reged: 09/08/05
Posts: 112
Loc: MA
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Re: Oops. Mirror and tool are now one
11/04/05 08:19 AM
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Averted:
Since this recently happened to me while polishing a $10,000 32" diameter Lighweighted blank, and since no one else has posted the solution that eventually worked for me, I'll give you one more way out of this fix (try the others first).
Make six wooden wedges with the wedge taper at about 10-15 degrees, and the thin edge of the taper thinner than the pitch lap thickness. Using a chisel or other suitable tool, create six pockets at the edge of the lap by chiselling out the pitch (taking care not to scratch the optical surface if possible). Insert the 6 wedges into the chiseled pockets, and sequentially tap the back side of the wedges in towards the center of the hated mess, until separation occurs. I had to do this three times before the 32" was finished, and (praise to the gods) did not cause any harm to the mirror.
Scott Milligan
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