[SML] Sanding/Grinding Glass

[Steve Boone]

If it’s relatively slight, a coarse wet stone w/water will slowly do what you want and avoid the worst of the hidden stress that machine grinding will cause.
If you know anyone in a chemistry department with a glass apparatus shop, you might be able to cajole them into re-annealing the shades after grinding, and relieve any stress that’s built up in them.

The down side to grinding glass is stress gets built up inside the piece and all it takes is a small tap in the right spot to cause the piece to crack.

Steve Boone

On Oct 20, 2016, at 3:00 PM, stagecraft-request at theatrical.net<mailto:stagecraft-request at theatrical.net> wrote:

Message: 2
Date: Wed, 19 Oct 2016 11:13:56 -0400
From: Matthew Whiton <mattwhiton at gmail.com<mailto:mattwhiton at gmail.com>>
To: Stagecraft <stagecraft at theatrical.net<mailto:stagecraft at theatrical.net>>
Subject: [SML] Sanding/Grinding Glass
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All,

      I bought some classic green glass lamp shades 10" cone with a 2.25"
fitter to use with some cord pendants. The glass shades are so poorly
manufactured that the fitter surface is not parallel with the bottom of the
shade so it hangs crooked.

What should I be using if I want to grind/sand the fitter surface down to
correct the problem?

I tried adding material to to compensate first, but that raised the fitter
up so that it doesn't seat in the indentation where the screws are supposed
to land.

Many Thanks in advance for your suggestions.

Matt

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