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[Linked Image from i.imgur.com]

I have this beautiful antique kerosene lamp. When they moulded the lamp they left a little rim of glass going around the middle of the finger grip.
This little rim sticks up about 1/16 of an inch. It digs into your finger when you hold the lamp.
I am a carpenter not a glass worker I don't know how to fix it.

Is there some kind of round file that I can use to grind down this little rim?
I just tried my ceramic stick knife sharpener, it doesn't work.

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I’d think a diamond file.

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Glass is made up from sand so i think some fine paper might wear it down.

A little at a time.Grits i have no clue about but it's worth a try.

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Use a variable speed Dremel tool and a diamond dust coated burr. Slow speed, gentle pressure, and don't let the heat build up. Getting the glass hot will make it crack. Doing the cut under a slow stream of lukewarm water in the kitchen sink might be a good idea.
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Wet sand with wet/dry paper. Start with 80 or 100 grit and work up.


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I’d leave it as it is, mold line helps to validate authenticity. Additionally, it will have to be polished after being removed or it will look worse than it feels now.
If you must, Aluminum Oxide backed sandpaper will do the job.


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A coarse diamond file. You will have many uses for it later, sharpening hoes, shovels, lawn mower blades...

10 bucks at Amazon

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Slowly..
There is some sort of abrasive paste they use for grinding lenses...
It might be enough to soften the edge a bit..


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It can be done with a Dremel tool and tungsten bits, but it should be done in water.


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Vibrating sander, do it all the time for table top edges not a big deal... 400 grit + or -


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I’d try the dremel approach with a small drum sanding attachment.

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Originally Posted by tndrbstr
I’d try the dremel approach with a small drum sanding attachment.



That, keep it cool.

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Originally Posted by Hotrod_Lincoln
Use a variable speed Dremel tool and a diamond dust coated burr. Slow speed, gentle pressure, and don't let the heat build up. Getting the glass hot will make it crack. Doing the cut under a slow stream of lukewarm water in the kitchen sink might be a good idea.
Jerry



Do as HRL suggests.


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Don't sand it, don't grind it. Instead, take a propane or MAPP gas torch (a mini torch would work perfect) and heat it until the glass starts to melt - it will smooth right out. It should only take about 15-30 seconds of direct heat. Then cut the flame and let it cool naturally at room temperature. Seriously, it will work like a charm.

That's how we "polished" the ends of glass rod and tubing in the chemistry lab, except we usually used alcohol burners instead of torches.

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Glass edges (glass panes) are normally ground with diamond wheels at high speed water cooled. However you can easily de-burr an edge like that with a Dremel and small sanding drum just keep it moving as to build up little to no heat. Emery cloth will likewise knock that edge off wrap it around a flat tool like a file and knock the burrs off. probably no need to use too coarse a grit work down and polish if needed. worked in the glass industry 3 1/2 decades.


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Originally Posted by simonkenton7
[Linked Image from i.imgur.com]

I have this beautiful antique kerosene lamp. When they moulded the lamp they left a little rim of glass going around the middle of the finger grip.
This little rim sticks up about 1/16 of an inch. It digs into your finger when you hold the lamp.
I am a carpenter not a glass worker I don't know how to fix it.

Is there some kind of round file that I can use to grind down this little rim?
I just tried my ceramic stick knife sharpener, it doesn't work.

A Dremel with a round burr or stone is your friend.

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Originally Posted by Triggernosis
Don't sand it, don't grind it. Instead, take a propane or MAPP gas torch (a mini torch would work perfect) and heat it until the glass starts to melt - it will smooth right out. It should only take about 15-30 seconds of direct heat. Then cut the flame and let it cool naturally at room temperature. Seriously, it will work like a charm.

That's how we "polished" the ends of glass rod and tubing in the chemistry lab, except we usually used alcohol burners instead of torches.


That’s the first thing I thought of as well.

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Originally Posted by Cheesy
Originally Posted by Triggernosis
Don't sand it, don't grind it. Instead, take a propane or MAPP gas torch (a mini torch would work perfect) and heat it until the glass starts to melt - it will smooth right out. It should only take about 15-30 seconds of direct heat. Then cut the flame and let it cool naturally at room temperature. Seriously, it will work like a charm.

That's how we "polished" the ends of glass rod and tubing in the chemistry lab, except we usually used alcohol burners instead of torches.


That’s the first thing I thought of as well.


Wouldn’t this subject the glass to severe thermal shock?


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You can heat it up but the chance a piece like that could have a small defect in it is pretty high and could easily break or shatter hardly worth the effort. Just sand file or grind it in a careful manner it will only take a few minutes....


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Originally Posted by Poconojack

Originally Posted by Cheesy
Originally Posted by Triggernosis
Don't sand it, don't grind it. Instead, take a propane or MAPP gas torch (a mini torch would work perfect) and heat it until the glass starts to melt - it will smooth right out. It should only take about 15-30 seconds of direct heat. Then cut the flame and let it cool naturally at room temperature. Seriously, it will work like a charm.

That's how we "polished" the ends of glass rod and tubing in the chemistry lab, except we usually used alcohol burners instead of torches.


That’s the first thing I thought of as well.


Wouldn’t this subject the glass to severe thermal shock?

Yes it would.


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