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Re: [ATM] Raised zone

Hello Mike,

I am trying to make a sphere before parabolizing. The shape of the rest of the
mirror is a sphere with a 1/2" wide central cavity with less than 1/4 wave. I
have checked the mirror with a Ronch grating of 100 lines per inch and with a
Foucoult tester. Because the raised zone is so close to the edge, I do 
not know
if the edge is turned down in relation to rest of the mirror. I think that the
method 6 of Jerry
> Oh.  I almost forgot to say what method number 6 is. Pretend now that the
> mirror was 1" larger in diameter. The "raised zone" is now starting 3/4
> inch inside the edge and extends to the edge. Continue with method number 3
> on the linked page. Start with the pressure just inside the pretend "edge"
> which is now 3 1/2 inches from the center.  If you think that I am crazy
> you are right.  But so is Texerau.  Look at his figure on retouching
> defective zones. That is Fig. 42 page 92 in my second edition. Look at
> numbers 6 and 7 in that figure. Notice that number 6 bottom is with knife a
> little farther from mirror and simplifies retouching by treating it as a
> raised edge. Pressure is on the overhang side of the tool and the work is
> TOT. If you insist on working MOT you can achieve the same result pressing
> on the side of the mirror NOT overhanging.

can work in this case. I am thinking in try it.

Tanks,
Matheus

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