Re: ATM Stressed Mirrors

["Peter J. Thomas" <pjthomas@snet.net>]

Gary Seronik wrote:

> You might at least try warping it into a parabola first - you've nothing to
> lose.  There was an article about this in the June '92 S&T.  The author was
> working with a 6" f/5 and claimed to be able to "tune" the mirror to a good
> parabola.  He epoxied a machine screw to the back of the mirror and placed
> the mirror on a piece of plywood with a ring of carpeting glued to it.  The
> screw passed through a hole and was tightened (accomplishing the warping)
> with a wing nut.

Has anyone out there every tried to make a parabola by stressing a blank,
grinding a sphere and releasing the stress?

Peter J. Thomas

Regards,

Peter J. Thomas