Re: ATM 11.2" F/2 Primary testing questions :)

[Ric Rokosz <radicell2@yahoo.com>]

--- "James W. Burrows" <burrjaw@earthlink.net>
wrote:ex >
> I'm guessing now that
> pitch starlaps (with calculated shapes) would do the
> job and leave a
> smoother surface.
>

Did a 18 inch f/2.8 cass with a 4 inch rough cut star
lap.Nothing fancy about the edge shape. Used rouge for
the final hour or so and got a very smooth surface.

One f/2.8 mirror in a lifetime is enough thanks..:))

> the figure.  With these fast aspherical surfaces,
> it's just not possible to
> bring to a full polish then figure.

It's not needed...with the amount of correction
necessary you start "figuring" at the begining of
polishing if you hadn't rough ground in the curve.

Ric
Toronto
CDN

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