Re: [ATM] Conic section manufacturing

[Ken Lowther <hermit@outofoptions.org>]

I remember it being discussed, but I don't remember any follow up.

Ken

Quoting Chuck Taylor <chucktaylor@speakeasy.net>:

> Everyone saw the spherical mirrors flexed into paraboloids. Has anyone
> here experimented with taking a spherical mirror, using a similar rig
> but flexing in the opposite direction (oblate) and then refiguring to a
> spheroid and releasing the tension to produce a paraboloid?
>
> It seems it might give a smoother figure since figuring is producing a
> spheroidal surface. And, it opens up the possibility for easier testing
> once you know how much flex to dial in.
>
> If it is not possible to flex all the way back to a sphere for fast
> mirrors, it might still mean you only have to test for a much smaller
> deviation from sphere than you do for a f/4 paraboloid --- flex part of
> it, polish to an elliptical surface and release tension to relax into a
> full paraboloid.
>
> It would be similar to the method of attaching weights to figure an
> off-axis section of a paraboloid.
>
> And, it might open up possibilities for producing a hyperboloid surface
> for those wanting to make an R-C.
>
> Thoughts?
>
> Chuck Taylor
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Hermit, holed up in Youngstown, Ohio
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