Re: [ATM] RE: RTV Silicone question

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

Richard Schwartz wrote:
> You are going to bond silicone to PVC?    Why not try teflon?

Sounds like an easy technique for attaching teflon for bearings.   ;)

All kidding aside, a fellow club member (Aart Olsen) made a superb 
lightweight secondary holder from PVC for our club dobsonian.  The 
purpose of this was to save weight in the secondary cage, because the 
16" mirror was made from 1" plate glass.  For details on this scope, see

http://bi-staff.beckman.uiuc.edu/~melockwo/telescopes/16in_CUAS/16in_CUAS.html

Click on the link at the bottom of this page to see the construction 
pictures, the first of which shows the secondary holder.

Aart suggested first sanding the PVC, then coating it with a thin 
layer of epoxy.  The epoxy can adhere to the PVC.  Then, we glued the 
secondary to the epoxy layer (rather than the PVC), to which the 
silicone can adhere.  You can see the thin epoxy layer in the first photo.

It's working so far.

> And then when it fails, you are going to go on the ATM list and announce to
> the world that silicone is N.F.G!

If this fails, we'll email the list.

	Mike Lockwood

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