Re: [ATM] polish time for 13 inch

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> > I don't see why oversized laps are considered so different?

> Because the literature doesn't describe it?


Yet the pro literature describes 6:5 oversized laps - see Brashear from the
late 1800's.   I understand that o.s. laps were probably used from almost
the earliest times of mirror making?

o.s. laps are easy to stumble onto.  I did so many years ago when pitch
gradually sunk and worked its way over the edge of a 100% sized polishing
tool.  I saw that I had a most exquisite edge and parabolic correction in
the outer zones.  I then cast a gaze about as to why that might be, and
zeroed in on the lap that was, by virtue of the lap squeezing over the
edges, a little oversized.

If you don't know what you're doing, follow the rules.
If you understand the principles, follow principles and forget the rules.

Principles give you a richer context with lots of possible solutions.  Rules
only give you a single solution; governed by fear --- you best not deviate!

Mel Bartels


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