meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on Dec 23, 2011 20:07:35 GMT -5
I am building a new arbor that is going to have many hard diamond wheels on a 1" diameter shaft. I estimate 20 lbs worth of 8" wheels. There will be 2 bearings in the center and 1 on each end of the shaft.
What kind of horse power (HP) motor do I need to make this work efficiently and without the shaft slowing down if I apply too much pressure to one of the wheels?
:-) Dave
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Post by johnjsgems on Dec 23, 2011 20:55:35 GMT -5
Barranca's (formerly Star Diamond) now discontinued GP-8 had two very heavy, all steel brazed diamond wheels, two 8" X 3" expandos, and spin on polish discs each end. They had to use either a good 3/4 hp motor or a really high torque Baldor 1/2 hp capacitor start motor. Lighter duty 3/4 hp motors overheated pretty quickly. If you use plastic hub wheels the weight is much less than either solid steel or the big expandos.
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on Dec 23, 2011 21:43:28 GMT -5
This makes sense John. So in terms of stats, what am I specifically looking for? What makes a 3/4 HP motor a heavy duty one?
And what about the torque stats for a 1/2 HP motor. What would they be?
What about a 1 HP motor? Would any kind work?
The reason my arbor is going to be so heavy is because I use two 8 X 1 1/2" grinding wheels for each grit (I stack them side by side). So I will have 2-40s, 2-60s, 2-220s, 2 8x3 expandable drums and 1 10" saw blade. This totals almost exactly 20 lbs. All of the grinding wheels are plastic hub, by the way.
:-) Dave
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Post by johnjsgems on Dec 23, 2011 22:13:18 GMT -5
High torque motors will have a start capacitor. They have a lot more starting torque under a load than a motor designed to turn a fan or something. I would search online for a capacitor start 3/4 hp motor. One hp may be overkill but if price is right it would be OK. Too oversized (underloaded) is not good either. Probably 56 frame, resilient mount rated enclosed drip proof, continuous duty, and thermally protected. Put a three step pulley on each side reversed and you would have a simple three speed unit.
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