Mike Hill
Cast Iron
- Joined
- Aug 28, 2004
- Location
- upper michigan
Hi all, I purchased a mg 10ee last weekend, I bought it knowing that the drive had issues that were unsolved. The lathe had its exciter removed and replaced with a power supply, I hooked power up to the machine crossed my fingers hit start and guess what nothing happened. So I did some poking around and found problems with the main contactor hit the start ago and the mg roared to life.
Next I tried the forward lever, and nothing happened, did some checks on the the added on power supply and discovered a blown fuse, now I had dc power hit the forward the spindle turns, good sign right, turned the speed up slowly and its good till I hit about 400rpm on the tach then the spindle would momentarly shoot up in speed to about a 1000rpm then drop to almost a stop then back to a 1000 over and over again.
If I try to get it above this speed it just slowed down, looking at the big rheostats I could see some arching on the one that is farther away from the sprocket.
I removed the rheostats and found the one labled 375 to have some missing windings, if I am looking at this right that one controls the field voltage and the other controls the armature?
So in the end my question is there anything else that will burn out this rheostat or was it just old age, and would this cause the described symtoms ?
Next I tried the forward lever, and nothing happened, did some checks on the the added on power supply and discovered a blown fuse, now I had dc power hit the forward the spindle turns, good sign right, turned the speed up slowly and its good till I hit about 400rpm on the tach then the spindle would momentarly shoot up in speed to about a 1000rpm then drop to almost a stop then back to a 1000 over and over again.
If I try to get it above this speed it just slowed down, looking at the big rheostats I could see some arching on the one that is farther away from the sprocket.
I removed the rheostats and found the one labled 375 to have some missing windings, if I am looking at this right that one controls the field voltage and the other controls the armature?
So in the end my question is there anything else that will burn out this rheostat or was it just old age, and would this cause the described symtoms ?