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Forums
4hv.org :: Forums :: General Science and Electronics
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Laminated glass

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Daedronus
Sun Nov 11 2012, 10:20PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		If I can I will get a one piece 12x1" or a 6"x 3/4 + the aluminium plate.
If not I will use UV glass epoxy and try to make a 6"x3/4 laminate.

I can't believe how complicated it is to get a silly piece of glass.

And, the UV epoxy? it's something like 30$ for 1cm tube locally. It must be made out of unicorn poo or something.

The only reasonable thing was the aluminium plate, 300x30mm 47$ shipped.
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klugesmith
Mon Nov 12 2012, 12:01AM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Daedronus wrote ...
I can't believe how complicated it is to get a silly piece of glass.
An online search for telescope mirror blanks (before I read your PM about them being an option) immediately turned up a vendor who sells 6" x 3/4" for $25, 8"x3/4" for $35. We know that's plenty thick for vacuum. Don't know the cost to ship to Europe. Link2

This guy laminates glass disks by fusing them in a kiln. But you'd need to follow up by grinding and polishing at least one surface. Link2

If your plasma process might etch the glass, or deposit stuff that's hard to clean off, you might consider adding an expendable, non-load-bearing disk of inexpensive glass on the inside.
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2Spoons
Mon Nov 12 2012, 12:34AM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Daedronus wrote ...

And, the UV epoxy? it's something like 30$ for 1cm tube locally. It must be made out of unicorn poo or something.

LOL - we use a lot of UV cured glue at work. And yes, its expensive in small quantities.

Just use boat builders' laminating epoxy.
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Daedronus
Mon Nov 12 2012, 09:52AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		telescopemirrorblanks.com was one of the sellers I tried to contact.

He went into unobtanium mode as soon as I told him the shipping address.
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Daedronus
Thu Nov 29 2012, 04:41PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		Check this out:

1354207102 2329 FT1630 Img 4500


And the good news is it didn't implode.
and yes, it's scratched like hell on one side dead

Bad news, now I have to drill at least one feed trough, I wander if it will still resist under vacuum.
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Ash Small
Thu Nov 29 2012, 05:12PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		Drill through the blanking plate on the underside, rather than through the viewport.
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Daedronus
Thu Nov 29 2012, 07:19PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		too late, and I need it to be electrically isolated, so I will leave the bottom plate alone.
not to mention the glass was just as expensive, so if I mess the bottom plate it's the same cost.

I drilled it, and it still didn't implode.
1354216615 2329 FT1630 Img 4504


I do have two 6mm acril plates as blast shield on top of it.
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...
Fri Nov 30 2012, 02:26AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		Looking good! Where did you end up getting the plate?
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Daedronus
Fri Nov 30 2012, 03:13AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		Link2

Problem is, for telescope mirrors they don't really care if there are scratches, I should have made it clear from the beginning that I don't need it for a telescope. sad

oh well, I can see inside, and the glass is good enough to seal against the o-ring.

I also found this guy:
Link2

But he took ages to replay and by that time I had already ordered the plate.
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Adam Munich
Tue Dec 04 2012, 01:35AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		Fusor or cyclotron?
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