nik
spending too much on rocks
Member since May 2019
Posts: 315
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Post by nik on Jul 7, 2019 2:35:46 GMT -5
I'm in process of putting together what amounts to a completely new shop. The planned machines will be a 7" super grinder and 10" trim saw based on an old poly arbor, a 6-8" dedicated polishing head, and the 6 wheel grinder that I'm working on. The polisher is pretty standard and will take either 1" threaded faceplates or 1/4 20 threaded pads. The poly will have about as many 7" turbo blades as will fit on one end and the 10" blade on the other. The grinder is where it gets interesting, there are 4 heavy sintered wheels plus an 8" expanding drum and flat lap all on a 1" x 27" shaft. The rotating assembly weighs about 70 pounds.
The three motors that I have to work with are a 1hp 3450rpm Person washdown rated, a 1.5 hp 1720 rpm GE, and a .75 hp variable speed industrial sewing machine motor 250-3450 rpm. The two big motors are continuous duty fully sealed, and the small one is a bit questionable in regards to cooling and wet use.
The question is, what motor to use on each machine. I'm leaning strongly toward using the sewing machine motor on the polisher. I like the idea of variable speed, and likely won't be running it for hours on end.
I've got pulleys on hand for both of the big motors to turn the driven shaft at about 1700rpm if it makes a difference.
I know they are a bit overkill, but the 1.5hp was free, and the 1hp was cheap
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