Re: (ATM) Re: Plate glass thickness

[Bob Madden <madden@netcom.com>]

Usually in production thermal bonding of parts with epoxy, the adheasive 
is carried in a cloth scree that is open weave. I think the idea here is 
use something like hardware cloth used for screened doors saturated with 
epoxey. It sounds like it would work well when the epoxey hardens. The bond 
line should be as stiff as the epoxey.

Friendly Bob

):-{])) <----   madden@netcom.com
                madden@svpal.org
 Remember amateur astronomers:
"keep looking for the next Universe"

On Mon, 16 Oct 1995, Michael Pendley wrote:

> I am not sure I understand - do you coat two faces with epoxy, lay in
> threads and press or do you separate the two disks with threads then run
> epoxy around the edge?
> 
> Do you see any funny thermal effects?
> 
> 
> > .....
> >- the blanks are factory polished, we grind them flat with a medium
> >coarse grain;
> >
> >- both sides of blanks are epoxied;
> >
> >- fine coton threads are placed horizontally between the disks to provide
> >microscopic spacing.
> >
> >We get this way a low cost plate blank of adequate thickness to avoid any
> >flexture
> >and possible astigmatisms.
> >
> >I' ve used also a full size glass tool with square glass tiles to reduce
> >friction during
> >fine grinding a 20". None of the tiles ever came off.
> >
> >
> >Clear skies,
> >Stefano
> >Milan, Italy
> 
> 
>