- Joined
- Dec 8, 2015
- Messages
- 122
I purchased a used 1/3 HP 1725 (sleeve bearings) motor to use on a drill press restoration. The motor/drill press runs fine at the three lower speeds - even under the load of drilling steel. The motor tachs at 1760 RPM. If I move the belt to the largest pulley on the motor – under no load- the motor will only rev up to 1100 RPM and you hear the centrifugal switch open and it will stay at that speed - for the few moments I dare run it.
If I remove the belt from the drill spindle pulley, the motor revs up to the 1760. I attempted to put a load on the motor, by pressing wood against the pulley, and it doesn’t bog down.
The start capacitor tested OK with ohm meter – but I replaced it anyway since it looked like it was starting to leak. I doubled checked the wiring per the diagram on the motor. I had put new bearings in the drill spindle on rebuild - it turns very smoothly – so I don’t believe that is the culprit.
The only thing that I can think of is with the larger drive pulley, is that he motor is starting slowerand the centrifugal switch is opening to soon) or Maybe being in the vertical position? Needs stronger springs? I know sleeve bearing are not the best to run vertically.
Does anyone have any ideas about what might cause this? Or what I might try to fix it?
Thanks. Jim
If I remove the belt from the drill spindle pulley, the motor revs up to the 1760. I attempted to put a load on the motor, by pressing wood against the pulley, and it doesn’t bog down.
The start capacitor tested OK with ohm meter – but I replaced it anyway since it looked like it was starting to leak. I doubled checked the wiring per the diagram on the motor. I had put new bearings in the drill spindle on rebuild - it turns very smoothly – so I don’t believe that is the culprit.
The only thing that I can think of is with the larger drive pulley, is that he motor is starting slowerand the centrifugal switch is opening to soon) or Maybe being in the vertical position? Needs stronger springs? I know sleeve bearing are not the best to run vertically.
Does anyone have any ideas about what might cause this? Or what I might try to fix it?
Thanks. Jim