This is what I suggest doing. If anything jams on a DC motor you can burn out a controller or motor in seconds. An additional AC motor like Kim has added is the way to go.
Kim also pointed me in the right direction when I did this too.
I suppose it's trvial, but when you spin a DC motor it becomes a generator, so as in one of the pictures, make sure the "idle" motor is unplugged.
Gary
So it is ok too hook it up as shown in Rich post? I still don't like the AC motor, i had to spin it too fast to get the job done, even with the air a lot of heat. I would like to find a DC motor, and controller about 2 to 2 1/2 hp reversible, veritable speed and probable a 1 or 1 1/2 may do the job. The Pennstate will almost do it. Although i need a different belt the one i an using if to flexible. Thanks for the posts.
I can core on my big lathe in the garage but i just don't like the one chuck holding my work, i thought i would like the two chuck support better. I have a rear chuck on the big lathe but it is 20 inches from the main chuck.
Is the AC motor 1725RPM..............?? You adjust the speed by changing pulley size.
And yes the DC motor still generates with the switch off.... the switch controls the AC to the controller not the DC between the motor and the controller. Turn the motor by hand in reverse and you will feel the drag because it is generating and creating back EMF.
Kim