Re: [ATM] fishing for a lil polishing advice!

["Jerry" <wa4guu@verizon.net>]

Your mirror is slightly oblate. Close enough to spherical that you have no
reason to worry.

Polishing takes time but you can work in long periods. You can see the
condition of the lap by just sliding the mirror one way and then the other.
You do not need to separate them except to dress the lap. You can feel the
action of the lap and know if it is working smooth and with good drag.

The fewer times you separate the disks the less chance of a bad thing
happening. Bad things can be anything from getting a piece of grit between
them, or dropping one or both, or dropping one onto the other, or the mirror
falling off the test stand onto the concrete floor, or bumping the mirror
into the water spigot and scratching or chipping it as you wash it clean for
testing.

Someone recently posted about a 15" (I think it was) falling off the test
stand onto a concrete floor resulting in a mirror of several segments
smaller than 15". Now if he was just looking at the figure for fun while he
was polishing, I'm quite sure he would say not to look at the figure when
you are polishing.

Not that I would never take the disks apart or otherwise handle them
unnecessarily, but if I do and something bad happens I know what to say. "I
will never do that again."

Whatever ugly thing you can polish in you can fix rather fast after
completion of polishing.


Beer and women are not wastes of time. They are a waste of money.

Jerry




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