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Old 02-04-2012, 02:43 PM
Eli Jensen's Avatar
Eli Jensen Eli Jensen is offline
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Motors

Hey everyone, sorry for starting a new thread I could have sworn I had another thread somewhere about motors. Anyways, looking ahead to upgrading my grinder this summer and saw this ad. Which of this COULD I use with minimal modification? Which would be BEST? (given that they are in good condition, which I won't know till I see em.)

http://prescott.craigslist.org/for/2811892107.html
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Old 02-04-2012, 04:40 PM
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Ray Rogers Ray Rogers is offline
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Compressor motors are designed for intermittent duty, not continuous. Could work for a while but a burn out is likely. Cooler motor probably low hp and low torque. Same for washing machine, generally low torque - could work but depends on what you are upgrading from. All these motors are probably open frame drip proof motors, meaning grinding dust could get inside easily. Lots of guys get by with open motors but TEFC (totally enclosed fan cooled) motors are preferred on grinders.

The 3 phase would do great if and only if you can acquire an appropriate phase converter since it cannot run on house current. A good converter is fairly pricey.

A new 2 hp TEFC motor should be available for around $300 in 120v and 220V from Grizzly. There are other sources but if you can swing the price that's the kind of motor to lust after.

Aside from that, you can get by with any of those motors for a while if they have at least 1 hp. You probably don't want a motor with more than 2 hp on 110v as it would draw too much amperage for the normal house wiring but a 2 hp 220v motor would be great if you have 220 available ....


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Old 02-04-2012, 07:00 PM
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Eli Jensen Eli Jensen is offline
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I'm upgrading from a damaged 1/2 hp motor, which I believe is also open. What about the ball bearing grinder motor? I'm not even sure what that is.

Just looking for a bargain. But this isn't something I want to skimp on so I might buy new. I was looking at the motors you mentioned from Grizzly, so I might do that eventually.
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Old 02-04-2012, 07:46 PM
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I don't know with certainty about the ball bearing motor, naturally, since I haven't seen it but if it is a bench grinder motor as I assume it is then it is probably a fractional hp motor with limited torque. They do make some monster grinders with heavy motors but I have no reason to think this is one of them. As I said, most any motor with enough power will work at least for a while. Compressor motors will be very powerful and have tons of torque but if it is a real compressor motor it's probably 5 hp or more and will require 220v...


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