ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
I want to refurb and use a small 220/380V 3-phase motor. It's Swiss, 1/2 HP (=400 Watt) and was made for driving an internal grinding spindle via pulleys. The motor dates from the 1960, I would guess.
I opened it up and discovered two things that need attention. First, someone pumped far too much grease into the bearings. The windings and a lot of the other internal components are covered with a mix of grease and grit.
Is there a good way to clean out the motor windings? I suspect this is from the days before epoxy was used for potting windings.
Second topic: the bearings are both toast. They are GMN 6202 without shields. meant to get grease from external grease nipples. Should I replace them with the same type of open bearings? Or metal shield ones? Or rubber seal ones? C0 or C3 clearance? (This motor drives a 250mm/10" diameter flat belt pulley, and does not have belleville washes or some other way to preload the bearings.
Thank you!
I opened it up and discovered two things that need attention. First, someone pumped far too much grease into the bearings. The windings and a lot of the other internal components are covered with a mix of grease and grit.
Is there a good way to clean out the motor windings? I suspect this is from the days before epoxy was used for potting windings.
Second topic: the bearings are both toast. They are GMN 6202 without shields. meant to get grease from external grease nipples. Should I replace them with the same type of open bearings? Or metal shield ones? Or rubber seal ones? C0 or C3 clearance? (This motor drives a 250mm/10" diameter flat belt pulley, and does not have belleville washes or some other way to preload the bearings.
Thank you!