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Old 08-05-2004, 06:51 AM   #1 (permalink)
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Changing motors

Anyone ever swap out the motors on tools such as drill presses and bandsaws to change the RPM's? I don't see why it wouldn't be possible to change out the motor with one that has almost identical electrical specifications (maybe more hp ) but with a different RPM. Has anyone done this?
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Old 08-05-2004, 07:26 AM   #2 (permalink)
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AC motors pretty much all run at the same speed. If you wanna slow the tool down, you gotta change pulleys or gears, or use a jack shaft.
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Old 08-05-2004, 03:09 PM   #3 (permalink)
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I have been kinda wonderin the same thing, but i want to add 220 to my table saw. Any advice there?? Sorry for the hijack
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Old 08-08-2004, 09:22 PM   #4 (permalink)
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Yea, the problem is that you have most likely a 1750 rpm motor and the next one up is like 3450 rpm.. That is too much of a change.

As for a 220v table saw, it can be done, but how big is the saw that you need to run it on 220v??
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Old 08-11-2004, 06:26 PM   #5 (permalink)
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I just want to convert my 10 inch sears table saw to have more power:-) thanks for any help...Tim
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Old 08-24-2004, 10:12 AM   #6 (permalink)
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No flames, just educating you on a common misconception.
Changing to 220v will not give you more "power". The amp draw rating on 220 is one half of the amp rating at 110v. Horsepower is derived from wattage, whereas 1 volt X 1 amp = 1 watt. Therefore 110 volts X 10 amps = 1100 watts. There are 746 watts in 1 horsepower not calculating efficency. The same being true that at 220 volts X 5 amps = 1100 watts. See, same horsepower.
Now the advantage in going to 220v would be for the reduction of voltage drop. If you run a long cord and its not heavy guage then you might see a voltage drop at the motor. This is more likely found with 110volt circuits. Less usable volts at the same horsepower required will equal more amp draw to the motor. This could be a bad thing because the motor is rated for only a certain amount of amps.
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Old 08-24-2004, 06:10 PM   #7 (permalink)
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Thanks for the info...I always learn something new everyday...I guess I will have to see why teh saw has issues...Thansk again
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