Changing the motor on a drill press - Router Forums
 
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post #1 of 6 (permalink) Old 01-18-2012, 07:26 PM Thread Starter
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Default Changing the motor on a drill press

I have a Rikon radial benchtop drill press, it has a 1/3 hp 1720 rpm motor on it and I can easily stall it out, (and have several times) . I am looking at a 1 hp 3450 rpm motor to replace it, but not sure about the speed increase, anybody know if I can reduce the rpm at the motor? At a minimum let me say that I am not a big fan of 1/3 hp motors, wish I had known how wussy it was before I bought it.

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post #2 of 6 (permalink) Old 01-18-2012, 08:24 PM
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It would be much easier to just replace the motor with one that has the same rpm.
Otherwise, you will have to change to pulley sizes to compensate for the rpm increase.
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post #3 of 6 (permalink) Old 01-18-2012, 08:50 PM Thread Starter
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Originally Posted by barking spider View Post
It would be much easier to just replace the motor with one that has the same rpm.
Otherwise, you will have to change to pulley sizes to compensate for the rpm increase.
Ahhh yes, I thought about that, but the price is right! How is the speed determined? Is there an electrical solution, like remove this or that and the motor will slow down? (I don't mean remove the plug from the wall)! Or what about a rheostat, would that slow the motor but keep the hp?

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post #4 of 6 (permalink) Old 01-18-2012, 09:37 PM
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Ahhh yes, I thought about that, but the price is right! How is the speed determined? Is there an electrical solution, like remove this or that and the motor will slow down? (I don't mean remove the plug from the wall)! Or what about a rheostat, would that slow the motor but keep the hp?
From you post, it's clear that both the old and new motors are induction motors. Electronic speed control for these requires a frequency control unit and, although they are less expensive now, they're still not cheap. It would be cheaper to buy the right motor.

A 1720 rpm motor has 4 poles whereas a 3450 rpm motor has 2. You cannot simply rewire anything; the construction is different.

You'll want to by a closed frame, fan cooled motor. The cheapest one I've seen is from Harbor Freight but you might be able to find something on Craig's list as well. Make sure the shaft will fit your pulley (these type/size motors always have a 5/8" shaft).

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post #5 of 6 (permalink) Old 01-18-2012, 09:56 PM
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Jack, the 3450 motor might work okay if you are only drilling wood. It will likely be too fast for metal except for small bits. Too fast tends to heat the metal up and work harden it in some cases and the extreme heat takes the temper out of the drill bits. It seems contrary to logic but you can drill metal faster at slower rpm than high rpm.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #6 of 6 (permalink) Old 01-18-2012, 10:21 PM Thread Starter
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Ok, ok, I'm starting to get the point. I'll keep my eyes open for a new motor that's running @ 1720. Robert, I didn't know all that stuff about motors, but I'll keep it all in a back room in my mind!

Jack


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