Re: ATM Extremely oblate

["Bob May" <bobmay@nethere.com>]

If you're figuring, you may want to get off the machine for a start.
Second, if you are on pitch, the surface is getting oblate spheroid (TUE and
so forth) from the fact that you aren't on the edge long enough to drive it
down.  You are spending most of the time in the 50-80% zone with the real
working part of the lap.  In addition, if the lap isn't fully in compliance
with the mirror, it will also do that as well as the pin's pushing point
being too high on the tool, pushing the leading edge of the tool down into
the mirror.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net