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Old 12-22-2009, 05:47 PM   #1
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Default Compressor motor for Barley crusher?

I had a oiless compressor throw a rod almost in my face the other day. The tank is now a piggyback to my other compressor. The motor looks smaller than most of the motors I see being used with a BC but the compressor says it's rated at 5HP (peak). Here are pics of the motor, it has fan cooling on the end, and I think I can separate it from the compressor unit. I imagine I'll need a serious pulley to slow this thing down, and I don't know the RPM of the motor itself. Here are pics. Input is appreciated.
Currently I use the BC with a geared Milwaukee 1/2" drill which works great but the drill is so heavy, it becomes awkward and I have had some mishaps.
I was hoping to motorize this rig with stuff I have here, for the most part.






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Old 12-22-2009, 05:50 PM   #2
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Anything is possible. It should have the torque but you are gonna have to search out the RPM to properly match the pulleys to a useful speed lest you have a speed controller too.

Hell, I rigged mine with a trolling motor.


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Old 12-22-2009, 06:58 PM   #3
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If it runs on 15 amps, then the 5 hp is very 'peak'. Continuous, it is probably less than 1 hp. Plenty for your application and it already has one reduction step. I would be surprised if it was anything other than 3600 rpm, as mechanical speed reduction is way cheaper than winding a multi-pole AC motor.
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Old 12-23-2009, 03:17 PM   #4
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The reduction step that is built in happens to be the flywheel for the compressor. I might be able to put a pulley on the backside of the flywheel, but the frontside is offset for the stroke of the motor.
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Old 12-23-2009, 03:55 PM   #5
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Sounds like you'll be better off finding new pulleys. An old dryer is a good source.
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Old 12-23-2009, 05:58 PM   #6
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I'm betting the motor turns 1'800 rpm though 3'600 is a possibility. I think the motor will be 1'800 because I'm guessing that is a better speed for the air compressor.
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Old 12-24-2009, 02:58 PM   #7
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Hmmm, I'll check with a friend who seems to have junk appliances in the yard.
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Old 12-24-2009, 04:28 PM   #8
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What RPM are you looking for a grain mill? I have a high speed fan motor, and now an icecream maker motor and gearbox i could use. As well as the old trolling motor.
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Old 12-24-2009, 07:04 PM   #9
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200 rpm or less is typical


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