Chipped Crystal Glass

Angle grinder, diamond disk. I saw someone cut a glass jam jar by immersing most of it in water to damp out vibrations that would otherwise cause it to shatter.

If it's moulded rather than cut why not just bin it? It's not worth trying to fix.

You could grind it, but I'd do it by hand: get a flat sheet of glass, use some fairly coarse carborundum grit (say -80s or -120s) scattered fairly generously on the glass, wet it to make a paste, invert the crystal whatever-it-is and grind away using a circular motion. It'll be slow; you'll probably need to change the grit to finer grades as you get down to below the edge of the chip, and the ground surface will always be matt, never the original flame-polished edge it was.

Alternatively look on Ebay for a replacement and chuck the chipped one away. Not d-i-y but a lot quicker and simpler.

Not moulded so much as partially melted as the glass was made from the blob of crystal.

Not fixable IMO.

Wot e said, only I'd use wet-or-dry paper, on a sheet of glass, lots of water.

Start coarse, maybe 120? Low pressure, too.

Thomas Prufer

Shouldn?t it be glasspaper?

I?ll get my coat

GH

When I tried to cut glass goods on an abrasive disc tile cutter they always shattered. I presume the abrasive was too coarse. I was certainly being gentle.

NT

I was just thinking the same. I've certainly never heard of anyone successfully repairing or grinding down something like this. If it chipped it will chip again, points to naff crystal in the first place. Brian

No the inside is often at a different tension which is why one chip leads to more and more. Horrible stuff if damaged. If it was part of a set, if you know the company they might be able to sell you a replacement. Brian

Cursitor Doom snipped-for-privacy@notformail.com wrote in news:q0g4ur$e9a$3@dont- email.me:

Ah - I suspect "Flame Polished" is a description of the rim.

If the OP is serious about repairing this glass then the last step will be to run a flame around the rim to blunten the sharp edge.

A lot of stuff on flame polishing glass here, much of it to polish rims of glasses made from wine bottles, which will be similar to what you want to do.

Chris Hogg snipped-for-privacy@privacy.net wrote in news: snipped-for-privacy@4ax.com:

Thanks - beyond me!

When I was at university, we had a bloke in the basement who made all the special glass apparatus, discharge lamps, etc required for the physics experiments. Every few years, he did a public demo showing how different things were made, and that was something not to be missed - he was amazing. I got to make a small discharge tube in the glass workshop.

Apparently, a few members of staff regularly brought in wine glasses to have chips taken out. He did it, but commented on the poor quality of the glasses and that if they were good quality, they wouldn't chip so easily.

DerbyBorn explained :

I have seen it done in a glass factory, making fancy drinking glasses amongst mass produced items like milk bottles, beer bottles and cheap molded drinking glasses. For the fancy hand made ones, they had them on an automatic process, a powered revolving table and a small gas flame would come in for just a few seconds on the rotating rim. The cooling glasses would then move along on a conveyor.

In my teens I would cut, bend join and carry out the above process on glass tube for chemistry experiments. It was quite a satisfying process, I remember.

If it is chipped, you probably have nothing to loose in trying, or take it to a neon sign maker, to see if they could do it.