Was this overkill?

Danbo

Danbo

Joined
Nov 28, 1999
Messages
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Recently, I bought one of the 4140 steel 9" flat discs from Rob Frink. Been looking for an inexpensive motor ever since. Found one today(even if it's not ideal). Found a nice condition, used Baldor 3hp single phase motor for $100. Right now it's wired for 110, but I'm going to have it wired for 220 soon. Runs at 3450, so it's probably too fast for ideal conditions, but it's gonna have to work for now.
 
3hp at 110v sounds kinda suspicious...

All the Baldor motors I've seen run on 110v top out at 1.5HP...(do you have a pic of the motor plate?)



But your question - overkill? Yes, definitely. But something's better than nothing, right? :thumbup:
 
Danbo

110 V x 15 A = 1650 Watts = 2.02 hp

110 V x 20 A = 2200 Watts = 2.95 hp

With a typical 15 A houshold circuit, you will only be able to put 2 hp of electrical power into your motor. To get the full 3 hp from your motor, you would need to connect it to a 110 V, 20 A circuit or a 220 V, 10 A circuit. If you don't fully load your motor, it won't draw the full rated current (half load = 1.5 hp = 10 A at 110 V) and you won't have any problems running it from 110 V. Many of the other people that I have heard of building disk grinders have used motors rated at 1 hp or less quite sucessfully.

I have been collecting the parts to build a disk grinder for myself. My motor is also rated for 3500 RPM. I was going to mount the disk on a second shaft and drive it using a pair of step pulleys to reduce the speed. I have yet to price out the extra shaft, pulleys and bearings but I suspect that they would cost $50 to $100.

Phil
 
Dan...that is way to fast!! You are going to burn any material you try to flatten!! You need a variable speed contoler on that for sure!!!

Tom
 
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