rivett608
Diamond
- Joined
- Oct 25, 2002
- Location
- Kansas City, Mo.
A while back I had a small drill press motor that was acting up, see details below from an earlier post. This drill press I had bought years ago on ebay as a spare and never ran it. After checking things and cleaning it and I realized the motor's trust washers were put in wrong and the brushes were not in good contact with the commutator which was also worn uneven. So I turned it down, took off maybe about .005 to .010" and then cleaned out the spaces between with a graver. Removed any burrs with a #6 cut file and burnished them a bit. Also filed the ends of the brushes to the correct profile. It now runs much better but sometimes it still sparks way too much and the speed is not consistent. Most of the time it feels like it is running slow.
What could cause this? When I cut the slots in the commutator I was worried I would cut too deep, does this sound like some could be shorting out? Was burning a bad idea? I read somewhere it said do not use sand paper on a commutator.
The wiring looks good, the motor is not heating up, the belt tension is fine as are the bearings. I have a 3 of these on a bench and have been using the for decades so I know how to adjust them at their sweet spot.
Thanks,
Here is the original post.
"I have a bunch of Cameron Drill presses, These were made in CA. starting in the 1960s and stayed nearly unchanged for 50 years. The motors they originally used were built for them and I understand they have run out of them and the parts. They were a 110 volt motor with brushes kind of like a sewing machine motor. I have one that when I take it apart everything looks fine but when I turn it on it starts off slow and blows a lot of smoke out of it and then it seems to run smooth and at speed after a minute or so. It also stops blowing smoke. I do not think there is too much tension on the belt or any other source of resistance in the spindle or motor bearings."
What could cause this? When I cut the slots in the commutator I was worried I would cut too deep, does this sound like some could be shorting out? Was burning a bad idea? I read somewhere it said do not use sand paper on a commutator.
The wiring looks good, the motor is not heating up, the belt tension is fine as are the bearings. I have a 3 of these on a bench and have been using the for decades so I know how to adjust them at their sweet spot.
Thanks,
Here is the original post.
"I have a bunch of Cameron Drill presses, These were made in CA. starting in the 1960s and stayed nearly unchanged for 50 years. The motors they originally used were built for them and I understand they have run out of them and the parts. They were a 110 volt motor with brushes kind of like a sewing machine motor. I have one that when I take it apart everything looks fine but when I turn it on it starts off slow and blows a lot of smoke out of it and then it seems to run smooth and at speed after a minute or so. It also stops blowing smoke. I do not think there is too much tension on the belt or any other source of resistance in the spindle or motor bearings."