Specs for a drill press motor?

[larryq]

A while ago I picked up a vintage Craftsman benchtop drill press, which has the same look as this one here (though mine is much dirtier):

http://vintagemachinery.org/photoindex/detail.aspx?id=1530

Mine also has a four knob handle, and is possibly just a bit bigger than the one I've linked.

It came with a really old 1/2 HP motor and I was sure it was only a matter of time until it burst into flames. So I tossed it-- I would have read the specs on it but other than the HP the rest was nearly illegible. Now I'm looking for a replacement.

I'm in discussion on Craigslist for a new 3/4 HP Dayton motor, 1725 RPM, reversible rotation, that has a type 56 frame mount, is single phase and can run on 115 or 230v. It weighs about 30 lbs. Seller is asking $80.

Does this sound like something workable for the drill press above? Is 3/4 HP too much oomph for this unit? I figure within reason that more is better but am no expert.

Thanks!

 

[rsanter]

Yes that will work

Bob

 

[exmaxima1]

A while ago I picked up a vintage Craftsman benchtop drill press, which has the same look as this one here (though mine is much dirtier):

http://vintagemachinery.org/photoindex/detail.aspx?id=1530

Mine also has a four knob handle, and is possibly just a bit bigger than the one I've linked.

It came with a really old 1/2 HP motor and I was sure it was only a matter of time until it burst into flames. So I tossed it-- I would have read the specs on it but other than the HP the rest was nearly illegible. Now I'm looking for a replacement.

I'm in discussion on Craigslist for a new 3/4 HP Dayton motor, 1725 RPM, reversible rotation, that has a type 56 frame mount, is single phase and can run on 115 or 230v. It weighs about 30 lbs. Seller is asking $80.

Does this sound like something workable for the drill press above? Is 3/4 HP too much oomph for this unit? I figure within reason that more is better but am no expert.

Thanks!

It sounds like a nice motor, but you need to confirm that the shaft size matches your pulley. Many of those older small drill presses had 1/2" shaft motors, while modern 56 Frame is 5/8". You don't really want to spend alot of time/money replacing the pulley.

 

[454ragtop]

Just a heads up, probably should ask about an old motor before tossing them. Haven't heard of any bursting into flames, usually it's old wiring that's a problem, but even then there aren't a lot bursting into flames. A 1/3 or 1/2 HP motor is what I'd recommend for that drill. 3/4 will probably work, but it's like killing flies with a sledge hammer.
Jim

 

[383 240z]

So the 2.5HP motor I'm putting on my Delta 17 is overkill? Using a treadmill motor so I can have low speeds and high torque

 

[exmaxima1]

So the 2.5HP motor I'm putting on my Delta 17 is overkill? Using a treadmill motor so I can have low speeds and high torque

Your Delta weighs 10x as much as the little CM benchtop press. Your treadmill motor is a great choice, since the hp drops proportionately with rpm. I use a 3/4 hp DC motor on my 1x42 belt sander, and I wouldn't call it overkill by any stretch.

 

[larryq]

It sounds like a nice motor, but you need to confirm that the shaft size matches your pulley. Many of those older small drill presses had 1/2" shaft motors, while modern 56 Frame is 5/8". You don't really want to spend alot of time/money replacing the pulley.

Thanks for the suggestion. The existing pulley slides on/off the rotor of my 1/2" grinder shaft with no effort, so it's probably a 5/8". Unless some older electric motors had 9/16" shafts? That'd be just my luck.

How much do 5/8" drill press pulleys go for, in case I do need to replace?

 

[zkling]

So the 2.5HP motor I'm putting on my Delta 17 is overkill? Using a treadmill motor so I can have low speeds and high torque

On top of what exmaxima said about speed and power, those treadmill motors are typically rated at a very high RPM to get the power up. So once you get the speed down to proper range, they are about just adequate for small(er) machines.

 

[383 240z]

My bad, missed the bench top part of his question.

 

[Outlawmws]

I think Larry's original Q's on the motor were answered, but th pully Q isa a tough one. fractional HP sheave aren't terribly expensive. Finding one that has the same spacing may be tough unless you get lucky...

On the Treadmill motors, another REALLY NICE feature on the control cards for these (at least the ones I have played with) is that even at low speeds, if you "bog them down" they run more juice to maintain their speed. so essentially a near constant velocity feature!

I've not yet had an issue with loading the motor at slower speeds.