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Tool Talk Discussion Forum

Re: Electric motor: power vs. rpm

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missouri massey man

12-24-2013 14:35:05

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In the rambling of my previous post I failed to address your main concern. Doesn't matter because I don't know the answer to the question you asked anyway, but my two cents is to start with a 1725 rpm motor and either sheave it to achieve your requirements or like others have said, install a set of step pullys. With the steps, when all those horses are not required but a little more blade speed is, you could increase the rpm accordingly.
Contrary to some of the other suggestions, being as how a VFD is a "linear" device means the lower the rpm request, the lower the amp draw which equates to less heat. Of course lower amperage means lower horsepower, so it would be hard to maintain if not impossible to maintain a 3 hp load at 600 rpm on a 1725 rpm 3hp motor with a vfd. Back to the step pullys.......

By the way, what size and brand of bandsaw do you have and what are you cutting to need a 3 hp motor ?? ...just wondering out loud...must be a biggun.

Again, not complete volumns could be written and still not get it all covered.

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Brad Buchanan

12-24-2013 19:40:48

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 Re: Electric motor: power vs. rpm in reply to missouri massey man, 12-24-2013 14:35:05  
The belt pully reduction is somthing that I considered however it would involve mounting a rather precisely positioned jackshaft and fabricating another motormount which would jut from this side of the machine.

Doable, but not a very elegant solution for the problem.

Thanks for your posts and interest.


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