How to wire a variable speed drill press

That may only work with a universal motor vs. the typical induction motor. I tried that out with a speed control on mine and the start and or run capacitors would kick in and essentially it became an uncontrollable variable speed at certain voltages. Other than that I was only able to actually reduce the speed about 10% from top speed.

This is correct. An induction motor will be ruined by constantly trying to control rpms via voltage reduction. You need a universal motor as stated above typically as found in a washing machine to do what you want. Then you could use a router speed control, dimmer control, or just about any rheostatic device that has the current handling capabilities of the motor your trying to replace. Be alert to the phasing of the motor. There is a BIG difference between 3phase and single phase motors.

Troy

I would check with the manufacturer and while they would have a "that would void your warranty" a tech there might be nice enough to give you "off the record" advice.

Some types of motors it would ruin, other types it might work just fine.

Steve

Motor speed control is not practical on a single phase induction motor such as is commonly found on a drill press.