Pillar drill motor question.

[squib]

I have an old atlas pillar drill with an underpowered motor and it is too fast,2400rpm.
My question is what motor should I be looking at? 2 pole,4 pole, induction etc.
Loads for sale on the bay new and secondhand, I also have an Hitachi speed controller which I may use.
I am thinking about 3/4 hp.
Any thoughts please.
Thanks.

 

[deema]

A 4 pole motor normally runs at c1500RPM at 50 hz versus a 2 pole motor that runs at 3000RPM.

I would check the frame size you need which is normally on the motor plate and order the biggest motor HP in that frame size with 4 poles. A cap start and a Cap run would be ideal for single phase. You will need to check your motor starter has a sufficient rating for the motor you choose. If the starter has a current limiter on it you may need to either set it for the new motor or get a larger rated unit.

 

[squib]

Very helpful, thanks.

 

[caveman]

As deema says, an induction motor is a single speed motor so I don't think you can use a "speed controller" with it. The only way to change speeds would be either changing the winding configuration, 2, 4 or 8 pole or use a multi pulley system. Most pillar drill have this method of speed changing.

 

[SammyQ]

Squib, I think I have the floor version of your Atlas drill. From memory, it has an under-1HP motor and I've never had it bog down in anything - including mild steel plate. The speed changes are by lifting the top cover and re-arranging the belt onto different pulleys inside the head casing. Good motors are three figures, even for this drill. Are you sure you need to 'upgrade'?

Sam

 

[squib]

The problem with my motor is it is too fast even on the slowest pulley configuration so I need a 1400rpm one and just thought to put a sensible size one on.

 

[SammyQ]

Oh. :? O.K., seems perhaps that someonebefore you has refitted the motor;agree that you need to change.


Sam

 

[t8hants]

Just to join in the conversation, I have a floor standing Denbigh pillar drill which also has a motor that goes around at lunatic revs per minute, it makes a very good rotary wire brush, part cleaning station.
As I would want to drill up to 1/2" in steel and I think I can see away to convert it to a three pulley system, would a 4 pole 3/4Hp motor be Ok?