Air power file conversion to 12 volt.
I bought an air belt grinder a while back which proved a little too air hungry for my compressor, so, rather than buy a bigger compressor I converted it to run off 12 volts.

The motor came from ebay as a 12 volt cordless drill spinning at 5000 rpm. I removed the air motor and as luck had it the 12 volt motor fitted perfectly in the grinder housing. I also turned up a 12 mm bush with a 3mm hole to fit over the motor's shaft and shrunk fit that into the belt drum, constructed a handle from 22 mm tube and inserted a switch in it. To protect the motor I turned down a PVC pip fitting and heat shrunk it over the motor leaving an air gap to coincide with the motors vents, Sikaflexed an end cap in place and cut some grooves under the cover to aid cooling.
The grinder works great and is certainly better than forking out $300 for a Makita belt grinder. some pics and a video:

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That's a neat conversion and it looks like you've created a useful tool. I often look wistfully at certain air tools but realise that my compressor would not run them; a low-voltage conversion makes sense.
Lathe (n); a machine tool used in the production of milling machine components.

Milling Machine (n); a machine tool used in the production of lathe components.
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I do a bit of fabrication, and have often thought wistfully of owning a DynaFile, but they're pretty spendy.

They do have a less expensive ($300 vs $500!) version powered by a hand grinder motor.

I keep toying with the idea of rolling my own, but other projects keep getting in the way. I'd want to make a flat platten option and a slack belt option.
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