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Old 10-25-2017, 08:40 PM
Josh Bernbaum Josh Bernbaum is offline
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Pneumatic rotary tool?

Hey, just curious if any folks have suggestions for models/makes of air-powered rotary tools that I could put Dremel-style bits in for coldworking glass. Hoping to find one that's comfortable as possible to hold onto for extended periods. Thanks in advance.
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Old 10-25-2017, 09:10 PM
Brian Wong Shui Brian Wong Shui is offline
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A quick search for “pencil die grinders” turns up some inexpensive options on amazon. Cheap enough to buy and try.

My experience with pencil type of grinders is that they tend to be annoyingly noisy since they are spinning so fast. Think dentist drill noisy. There are different air motors. The turbine style requires no lubrication. The other style requires lubrication.

My machinist friends like

http://products.dotco-tools.com/tool...ders/precision but they are probably relatively expensive.
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Old 10-26-2017, 09:16 AM
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Pete VanderLaan Pete VanderLaan is offline
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I use a die grinder from Dynafile but it doesn't take dremel bits. It is invaluable. 30 years ago when I bought it, it cost more than a really fine table saw.

It does what it has to do but inevitably, surface feet per minute becomes an issue if you're trying to remove defects. Nothing beats fire polish.
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Old 10-26-2017, 01:11 PM
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In my experience I would forgo the pneumatics and use a flex shaft like the foredom. Just keep the shaft well greased and oil the cullet after use. Pneumatic rotary tools lack power have little speed control and freeze your hands. I have several that I hate to use so a quality foredom would be my recommendation.
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Old 11-01-2017, 01:13 PM
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Ted Trower Ted Trower is offline
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We use a Dotco right angle die grinder at my day job. A few drops of oil in the air intake periodically will keep it running smoothly a good deal longer. Don't get carried away with this, remember anything going in the air line blows out the exhaust and onto everything around it.
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Old 11-02-2017, 08:18 AM
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Glenn Randle Glenn Randle is offline
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I really like the air pencil grinders. My first one was $15 from Harbor Freight & lasted many years. Spins 56,000 rpm and is very smooth and easy to sign work with. I also found that it's great for sharpening chainsaws too.

I always put a few drops of light oil in it before use. It finally died & the replacement one I found on Ebay included an inline oiler.

Bad thing is they consume a lot of air for such a small tool.
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Old 11-02-2017, 08:48 AM
Josh Bernbaum Josh Bernbaum is offline
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Thank you everyone for those replies. I found a die grinder made by DeWalt for $40 that accepts the 1/4" collet bits I'd like to use. So will see how it goes. It's nice that these air tools seem to be cheaper for the most part since they don't have their own motor. And thanks for the tips about the oiling.
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Old 11-02-2017, 10:29 AM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Josh Bernbaum View Post
Thank you everyone for those replies. I found a die grinder made by DeWalt for $40 that accepts the 1/4" collet bits I'd like to use. So will see how it goes. It's nice that these air tools seem to be cheaper for the most part since they don't have their own motor. And thanks for the tips about the oiling.
I used to keep one of those on my bench when I was doing a lot of Roll ups. A little black flake coming off of a piece of steel could easily be ground off in about two seconds while hot

Last edited by Eben Horton; 11-02-2017 at 10:33 AM.
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Old 11-02-2017, 11:40 AM
Josh Bernbaum Josh Bernbaum is offline
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Quote:
Originally Posted by Eben Horton View Post
I used to keep one of those on my bench when I was doing a lot of Roll ups. A little black flake coming off of a piece of steel could easily be ground off in about two seconds while hot
Yeah, I agree that's a nice tool to have to clean up any steel or even debris picked up from the marver. I've got a little battery powered Dremel I'm using for that now since my air compressor isn't always on and ready to go.
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