12 Volt Drill Motor Controller for 12v, 22amp 1/4hp DC motor

I need a motor controller which will produce variable speed, forward and reverse for a 12 volt , 22 amp, 1/4 HP dc motor. This motor has a reducer of 50:1. Is it possible to use a cordless 12 volt drill to achieve this purpose? If so, how?

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Re-design7 years ago
The drill controller will be too small and you'll burn it up.  But you could add a heatsinked transistor to increase the power rating.
It's been a while since you posted this, hope you will pick it up ---

I am using DC drill motors and the accociated controls for a power feed lathe, one for spindle rotation and the other for the feed of the overhead router cutter. I am using a 120acv - 24acv wall wart transformer with a bridge rectifier to convert to DCV for power supply. I also have two wheelchair DC motors, I may use one of them for the spindle power source. When I sand the shafts I will put a lot more resistance on the motor. The drill motor controls work fine on the large motor with no load but I think you are saying that when load is applied the controls will burn up --- correct? You said to put 'heatsinked transistor to increase the power rating' . WIll this reduce the over heating of the drill controls with the larger motor? When, where and which ones do I need to put into the curcuit.

The Craftsmen drill motor controls have a 1/2" x 3/16" dia. capacitor (smoother ?) in the trigger circuit but the Harbor Fireght one does not unless it very little and way down in the circuit board. I can't tell any difference in the preformance of the two drill motors. Should I put a similar capacitor in the HF switch.

One interesting thing is that the guts of both drills are very similar down to the way the parts are connected and the gears are built for the slip control. They look like twins even though they are different vintages maybe 5 years. I'm going to check out higher end machine parts lists to see if they are all the same, ahum -- stuff.
perhne (author)  Re-design7 years ago
Thanks for your comment. Will this heatsinked transistor get me up to 22 amps? Do you know of any other way to control this motor, such as rheostats, etc. By the way this motor is to operate the carraige on a band sawmill. It will activate the raising and lowering motion by the use of acme thread, gears and chain.
I'd love to have had a band sawmill when I was younger.

Google "dc motor contoller" and you will get lots of good links to a motor controller that you can use.  Here's a nice one but only works to 10 AMPs.  You could add a transistor or two to it to share the load and get it way up there.

To add a reverser, just add a DPDT switch after the controller.  But the switch has to be able to carry the current also.
gmxx7 years ago
 if you are willing to invest into this project, the victor 884 speed controllers are rated for over 50 amps. you are controlling huge amounts of power, and as such going with speed controllers will be more expensive than for a small robot.