Re: [ATM] Ronchi pattern

[Ken Lowther <hermit@outofoptions.org>]

Quoting Frans Franssen <f.franssen@planet.nl>:

> Hello list members,
>
> When looking at the Ronchi patterns of my full thickness 10" F 5,2 plate
> glass mirror after having tried to parabolize starting from a sphere, I
> see the lines inside the ROC sharply bend outwards at the edge of the
> mirror and inside the ROC they bend outwards at the edge. Does this mean
> I have a badly turned down edge or is there another error which I don't
> interpret rightly? I have  applied the long W stroke MOT method and my
> pitch lap is on the hard side.I would appreciate your judgement.
> Regards, Frans Franssen
>

Yes.  Your edge is turned.

Ken

----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

_______________________________________________
ATM mailing list http://www.atmlist.net/