From: J-Engineering 
To: "Bill T." ,
        "atm{at}shore.net" 
Reply-To: J-Engineering 


Hi Bill,

Actually, it seemed to work very well to get me to a smooth spherical
mirror. My questions were mostly motivated by checking to see if there was
anything I could do to improve the layout.  Kind of a "continuous
improvement program" I somehow imposed on myself.

So far, comments included:
1) 12 mm center to center between source and return is just fine, but closer may
be better for some (I assume faster)  mirrors. 2)  A 1.5 to 2.5 mm dia
source aperture is OK if you can get enough light out of
it.
3)  Watch out for long focusser tubes in combination with fast mirrors.

The assembly is a 1-1/4 dia plastic rod, cut into slices and screwed back
together.  Each slice is altered  to provide mounting geometry for the
light, ground glass chip etc.  The assembly is placed in an adapter, and
the adapter into the 2" JMI focusser.

Best regards,
Ray

"Bill T." wrote:

> > >I am using a JMI focusser as a linear guide so the tester will need to
> > >fit in a 1-1/4 inch dia adapter.
>
> The idea of using the focuser is very clever!
>
> Things will get a little cramped inside that 1.25" hole.  Why not
just screw
> a 1.25" dowel onto a large plate at right angles, and mount the LED and
> observing port on the plate?
>
> Bill T.
>
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