Re: ATM Air Spaced lens

[Gary Woodall <mandoman@ce.mediaone.net>]

I have some real nice circle cutting fixtures for my router. I made a space
shuttle with that once!

Gary


Colin Caissie wrote:

> I think I read in ATM 2 or 3 that if you want to build a refractor, you
> ought to have a lathe.  I don't know if you can cleverly fab a refractor
> cell as easily as a Reflector.  It's got to hold the lenses almost tight,
> needs close diameter clearances, and be adjustable.
>
> I would bet a custom built cell would cost, especially in the 6-9" range.
>
> Wouldn't it be possible to buy a slice of RMT  (Round mechanical tubing)
> from Marmon-Keystone or some other tubing vendor that is the correct
> diameter, cut/file to length and add retainer clips, a Round rubber o-ring
> (make one up from an o-ring kit or buy the round rubber from McMaster-Carr)
> and Mount this on a disk with the clear aperture cut out. Hat shape.  Mate
> this with push-pull screws to another plate which mounts to the tube.  It
> looks do-able with some basic tools.
>
> Personally, I'd try to build a space shuttle with a rock and a railroad
> spike, but that's the way I am.
>
> CSC
>
> At 12:53 PM 10/1/00 -0400, you wrote:
> >
> >Hi All,
> >
> >I have been enjoying lurking in the background. I have just ordered a few
> sets
> >of achromatic lenses. A
> >152mm and a 222mm. Can any of the list suggest a source of lens cells? Or
> even
> >some web site where
> >construction of cells may be discussed? This is a whole new realm for me in
> >that I have messed with
> >reflectors mostly and my books that I have do not really address such a
> topic.
> >Any help is appreciated.
> >
> >Thanks
> >Gary
> >in Chicago.
> >
> >
> >
> >
> >
> >