Motor for shaping disc

[kasperbunk]

I've been looking for a motor, but which one would you choose?

I prefer single phase motors 230V - 0.75HP
Which speed should I be looking for 1400RPM or 2800 RPM

1750RPM doesent seem to exisist in single phase motors

[scotties22]

Motor:
https://www.automationdirect.com/adc/Sh ... -P50-3BD18

VFD:
https://www.automationdirect.com/adc/Sh ... )/GS1-10P5

This is the setup that is widely used. I've got it myself.

[sandahlpipe]

If you have the money, the 1/4 or 1/3 HP (or even 1/2HP) can run off a typical 110V power supply. When you get up to 3/4 or 1HP, the VFD needs 220V input. I have 3 motors with VFD that work wonderfully for buffing and shaping. I don't usually change the speed, but it's nice to have the option.

1750 absolutely exists in single phase motors. Sometimes the nominal values range from 1700 to 1800, but a hundred RPM isn't a big deal either way. The 3600ish range of motors will work, but they may burn your work, and they have about half the torque of the equivalent HP rating at half the speed. So if you have a 1/4 HP 3600 motor, you may actually be able to push hard enough to bog it down with a block of briar. With a 1750 motor, you won't bog it down (at least not as easily).

[Bluesytone]

I have a 1750 single phase sitting here boxed up to send back because I ordered the wrong part number and needed a 3 phase... so i know for sure they do in fact exist

[DocAitch]

Where do you live? If you are in Europe, I can see why you limit your options.
I would go with the 1400 RPM speed, because I have better control at lower speeds. However, for rough shaping, either will work well.
DocAitch

[kasperbunk]

Yes Europe, Denmark for being precise.
Found this one on the danis answer for Craig list
But its a DC motor. 3000rpm 1 HP with speed regulator.
Would this one work? Its about 60$

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[DocAitch]

DC motors work fine. A lot of guys use treadmill motors, and they keep their torque at low speed.
DocAitch

[caskwith]

That motor will be fine. Main thing to watch for with DC motors is that they get hot quicker than an AC motor. AC motors are great for continuous service, DC are best for high torque, slow speed but intermittent service.

I use a DC servo motor to drive my power feed on my lathe, it works superbly even at crazy low RPM but it will heat up fast as it has no way to cool itself.