Drill press replacement motor

[FordMustangKingCobra]

So I have a drill press that came with a single speed 115v 7.4amp 1725 RPM 1/2hp motor that recently kicked the bucket, and a buddy of mine gave me a motor that is a 115v 3/4 hp 1110 rpm 4 speed motor with a 4 position rotary selector switch, I'm not exactly the most savvy when it comes to converting motors. Is this going to be particularly difficult to convert or is it actually quite easy?

 

[kbuhagiar]

So long as the mounting flanges on the new motor are the same as the old motor, and the the old pulley will fit on the new motor, you should be fine. Even if the shaft on the new motor is a different size, you should be able to drill it out or find a suitably-sized replacement. You will need to figure out a way to mount the rotary switch, but overall I would consider it a fun challenge and definitely worth the effort for the outcome (4 speeds vs. 1).

 

[FordMustangKingCobra]

So long as the mounting flanges on the new motor are the same as the old motor, and the the old pulley will fit on the new motor, you should be fine. Even if the shaft on the new motor is a different size, you should be able to drill it out or find a suitably-sized replacement. You will need to figure out a way to mount the rotary switch, but overall I would consider it a fun challenge and definitely worth the effort for the outcome (4 speeds vs. 1).

I checked the mounting flange it's the exact same and the spindle size is the same, and I've already devised a way to mount the rotary switch.

 

[micromind]

The old motor was 1725 RPM, the new one is 1110. You could increase the diameter of the motor pulley to make the spindle turn the same speed as before. The shaft diameter on both motors is 1/2", pulleys with a 1/2" bore are readily available.

The new motor is 4 speed but every speed connection will be a bit less than 1200 RPM with no load. It'll turn slower only with a load on it. It's designed to run a fan so there's always load on it.

The new motor will have less running torque and way less starting torque.

The old motor was either split-phase or capacitor start. The new one is permanent-split capacitor.

The new motor will work on a drill press. You can experiment with the different speed connections but you'll likely settle on the highest speed.

 

[bb29510]

i rather have the slower motor

 

[Lassen Forge]

Jeez, I did the same thing, bought a replacement Dayton motor for my drill press, now I just need to confirm the wiring on it... The old one was 1725 RPM 60 Hz 120 V, this one is 1440 RPM variable voltage (120/240) depending how it's wired...problem is it's damned hard to see upside down and backwards to make sure the wiring is set for 230V.

I may have to pull it back off the drill press to see what the hell I'm doing, but it's one of those PITA jobs...

 

[Bert_]

Kind of looks like a blower motor. They have low starting torque.

You probably won't end up using the lower speeds as they really only lower the torque. The "medium" tap will run at full speed when there is no load on the motor but it will only develop 1/2 the torque. On a fan this works to control speed since the torque required to turn the fan is proportional to the speed. Not the same on a drill press.

 

[OccupantRJ]

Jeez, I did the same thing, bought a replacement Dayton motor for my drill press, now I just need to confirm the wiring on it... The old one was 1725 RPM 60 Hz 120 V, this one is 1440 RPM variable voltage (120/240) depending how it's wired...problem is it's damned hard to see upside down and backwards to make sure the wiring is set for 230V.

I may have to pull it back off the drill press to see what the hell I'm doing, but it's one of those PITA jobs...

Would a picture help you? I use selfie mode to reach into constricted areas of machinery quite often for this purpose, and just snap away until I get the view I need.

 

[seber]

The 48Y frame indicates all dimensions are the same. With 3/4 hp you will have more power. I would look for a larger motor pulley if you want the same speed. But unless you work with wood, that may not be important to you. The slower speeds will be nice to have. The Delta motor you are replacing was probably made by Emerson.