Re: ATM It happens again (ctd.)

["Bill Kelley" <flex@commspeed.net>]

Arjan,
Take a look at your pitch tool. The center facets are probably closing and
polishing the center more than the edge.
Bill Kelley

> Thanks for the help so far, but i'm afraid new problems are recurring:
> I have dug out the high center, passed through a very nice sphere and i am
now slowly on my way to a parabola.
>
> However, i see things go wrong now. Although i'm doing the prescribed MOT
parabolization strokes, and even linger somewhat in the COC area, a central
hole is developing. This is what happened in my former figuring attempt, and
my suspicion is that i make a systematic error.