RE: [ATM] Figuring nightmare I need your help

[Ken Lowther <hermit@outofoptions.org>]

If you are over corrected the best thing to do is use 1/3 center over center
strikes and check often.  As you go back to the sphere you may hit your
parabola.

Ken

Quoting Brent Russell <brussel@bpc.org.za>:

> Hi folks,
>
> I microfacted and cleaned my lap and I pressed the lap well. Contact was
> good with  a nice polishing movement. Stroke is chordal with the center
> of the lap almost on the high zone. Overlap over edge is 2 inches.
> Overhang on the length of the stroke is 2 inches. I did 15 minutes good
> solid polishing and I have deepened the curve even more. Foucault
> readings are:
>
> 0.0mm
> 4.2mm
> 10.4mm
> 15.7mm
>
> Working the edge like this should have done different so what am I doing
> wrong here? I would have expected by working the outer zones I would
> have flattened the curve, but instead it gets deeper...
>
> I have checked the support of the mirror whilst polishing, I have
> concentrated where I put my hands on the tool so that I don’t expert
> pressure in the centre. But to no avail...
>
> Any ideas...
>
> Brent
>
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Hermit, holed up in Youngstown, Ohio
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