Any motor experts here?

[Marvelicious]

Here's what I have...





https://www.surpluscenter.com/Elect...PM-115-VAC-MARATHON-3-SPEED-MOTOR-10-2827.axd

I picked this up for my drill press, I'm hoping to use a base mount. Where can I buy the base for these things, and what measurements do you need to get the correct size? Also, this is a fanless motor, and I've got an external fan that I could attach, but can I retrofit an internal fan?

I would've bought something more appropriate, but I just couldn't find anything in the 1000-1100 rpm range that wasn't prohibitively expensive.

 

[SEV22XS]

I'm not an expert but what you have there is an mostly likely an ac condenser motor of some kind. I thin you will spend more money try to mickey mouse that little motor into working then just buying a proper motor or drill press. Your not going find a mounting base they normal hang from a bracket on the unit there installed and same with a fan good luck that is there normal job running a fan.

 

[Aceman]

I don't think that's going to work.

For starters, you don't have a proper motor j-box on it to run your wiring into. The motor wiring is just hanging out there, leading me to believe this motor is supposed to be installed in some sort of housing or HVAC unit where it's covered up keeping the wiring inaccessible.

It's one of those things that you'll spend more time and money, not counting frustration trying to make it work, and then it still won't be quite right, then if you just bought the correct motor in the first place and been done with it.

If you have the old motor all you need is the frame size, rpm, and voltage to pick out a new one. Then the new one should just drop right in.

 

[Marvelicious]

Yes, it is a motor designed for fan duty, but I do know that they make mounts for this style of motor: it is called a resilient base mount, I just don't know where to get them or how they are sized. The fan is a long shot, but building a shroud to mount the external fan is hardly a difficult task.

Anyway, like I said, I would've bought a motor with the appropriate mount and fan, but I couldn't find one in the speed range I wanted for much under $400. I'm sure I can figure something out for less than the difference!

Is there anyone here who has any useful input?

Edit: not directed at you Aceman...

 

[SEV22XS]

Well gee your welcome I thought it was useful input. I was trying to let you know you are trying to piss up a rope nicely. Good luck with GF project.

 

[lessersivad]

Marv,

Check this page out. Towards the bottom of the page.

https://www.dialmfg.com/motors.html

Is THAT what you're asking about?

Perhaps something from here??

http://www.mscdirect.com/browse/tn/...ssories?navid=12104501#navid=12104501&page=25

 

[nehog]

It is a 56Z frame, that's relatively common.

https://www.google.com/search?q=56z...la:en-US:official&client=firefox-a&channel=sb and find a mount that you can use and go for it.

 

[Norcal]

Try Grainger but any way you do it, all that you will is a hacked up electrical cluster bleep because there is no way to do it right with that motor.

 

[Marvelicious]

Oh my yes, I can certainly see that it would be impossible to mount an electrical box, perhaps joined to the motor by flexible conduit... what a cluster eff...

To those of you with helpful input, thank you. You'll have to pardon my irritation, it seems like pulling teeth to get helpful input without the peanut gallery tossing in half assed opinions on why it won't work.

 

[MTW]

To find a cradle base to fit it, should be pretty standard. Look for old furnace fan motors or ask your local scrapman to find one for you. 56 Frame. You also need the, clamp straps, capacitor and a mounting bracket for it.

The bad part of it is, rated for Continuous Air Over, with 1.0 Service Factor. Meaning it's designed to be cooled by being in the airstream of the fan it was designed for, and it has no extra margin for extra heat or current. Intermittent use on a light duty application would be OK. Continuous or heavy duty use near it's full load rating will let out the smoke. However it does have a Thermally Protected listing, which in theory would trip to warn you before letting out the smoke.

MTW Ω

 

[DekeT]

Oh my yes, I can certainly see that it would be impossible to mount an electrical box, perhaps joined to the motor by flexible conduit... what a cluster eff...

To those of you with helpful input, thank you. You'll have to pardon my irritation, it seems like pulling teeth to get helpful input without the peanut gallery tossing in half assed opinions on why it won't work.

You post on the interwebs, you get what you get. No need to get irritated over something you have no control over. And there is no need to criticize the opinions you got that you did not like. It's just bad form.

 

[Marvelicious]

I may have passed over a threshold with "teh interweb" where I just have no more patience... it may be time to quit posting of forums! Anyway, to address the actual well reasoned questions/objections... I realize this will be more difficult than just buying a copy of the original motor. My intention is to get a press that turns at 66% of the speed of the original - worth a bit of effort in my mind.

I've got the appropriate capacitor, and the wiring doesn't really concern me. I plan to mount a power box with a master switch for the motor itself, any extra fan I run, and lighting, while keeping the original start/stop buttons in place for the motor only. I'll probably locate the capacitor inside as well.

The mounting base/rings are available, and thanks to all for your suggestions on finding those... If I can't scrounge a used set, I found new Marathon parts through Electric Motor Wholesale.

The fan I potentially plan to use to cool the motor is the same diameter as the motor itself, so with just a bit of clever shroud work, it will mount right to the end and send at least as much air through the motor as it would get driving a fan. I haven't given up on adding an internal fan to it. I'm not convinced that this isn't something that can be done.

That leaves the 1.0 service factor... Really, this is the only thing that concerns me, but with the number of 1/2 or 3/4 HP drill presses available, I'm betting that I'm not overloading it. Time will tell I suppose. If I burn it up, I'll try something else.

Anyway, thanks to those that helped, and my apologies to those I snapped at. Still, I did ask for experts, not "guys who changed out a motor for an identical one that one time".

 

[LS6 Tommy]

That is definitely a direct drive stud mount blower motor, but the mount you need is a resilient ring base for a 56 frame motor. I hope things work out for you.

Tommy

 

[MTW]

While you're at it add a three speed switch and a reversing switch to your control box for added flexibility. Double pole double throw for the reversing single pole triple throw for the speeds.

For the fan the suction side to the motor and the exhaust side blowing up. This will work with Mother Nature instead of against her. The rotor already has some tabs acting as a fan internally. You just need some external flow to keep it cool.

I doubt you would ever overheat it with normal use in a home shop. Production use would be a different thing.

Don't get hung up with the naysayers. Take the info you get and run with it. Then with the experience you will become the expert.


MTW

 

[Marvelicious]

Thanks for the positive thoughts. I've managed to track down everything I need, including a fan that is better suited than the one I had. I had hit a wall with my Google hunting when I posted here, but sometimes an extra day and a clear head brings results.

I had definitely been planning on the speed and reverse switching. The fact that this motor is a three speed wasn't really a selling feature, but since I have it , I may as well put it to use. The lower speeds cut the HP down to 3/4 and 1/2 respectively, but if it bogs, it is simple enough to switch it up.

The closest I'm likely to get to production use is drilling vintage motorcycle brake rotors, and I'm likely to get bored long before the motor gets too hot! That's the kind of project better tackled in phases.

 

[Alan Douglas]

Speed regulation may be rather poor at the two lower speeds, so I'm not sure they buy you very much. Otherwise I think it will work fine, for light drill-press duty. The bearings may not be rated for vertical mounting, but again, it's light duty. I wouldn't, personally, bother with reversing, but again, that's your call.

 

[Marvelicious]

It is rated for vertical. The three speed thing is an experiment: if it works, wonderful, but unnecessary. I don't intend to try to do any tapping with it - I do so little that hand tapping works just fine for me - so the reverse switch will be mostly just for things like left-hand bits. It is more of a case of "why not?" than a real need.

 

[Executive]

The torque characteristics of that motor will change substantially at different RPM. Drill presses use a constant speed motor and change speed via pulleys for that reason.

Good luck, but this seems like a solution looking for a problem. Much easier to find an old press and recycle the motor.


Chris

 

[G_P]

Its probably going to take a lot of air flowing over that motor to keep it cool. Heavy drilling will burn it up or at least severly shorten its lifespan.