Re: 8.5" cassegrain help and other ATM comments.

["Peter D. Brooks" <pdbrooks@pacbell.net>]

Viper71049@aol.com wrote:

At that size, you can probably scrounge a piece the right size from a glass
shop.  I did much the same when looking for a 4.25" tool.  Hit up a glass shop,
told them what I was willing to buy, and they gave me a piece of 1/2" thick
glass.  Free.  'Course, I had to cut it to a circle, but that doesn't seem to
be a barrier....

FWIW, could you set your outgoing mail to "plain text?"  The font your mailer
is using is *huge* and it's surprisingly hard to read.

BTW, if you search for the Metal Web News, there's an optical pyrometer that's
cheap to implement.  The hard part is calibrating it, but a friendly heat
treating shop might be willing.  (Optical pyros use a calibrated current
through a lightbulb.  With a a stable current source you can get very
repeatable values.  Note that the heats have to be red or hotter.

Regards,

Pete Brooks