Please help me

[dman]

glad you got it. so was it running on only the start winding? or was it running on both? because i wouldn't imagine it would make too much noise running on the start winding alone. that could be hard to identify.

 

[canadianhorsepower]

dman----- they way it was wired both starting and running were working
all the time almost causing a shunt to slow one down

If they would ha had another same lathe at the store I would have tell
the noise difference. Know I know the joy of buying new things

 

[dman]

since i have seen that, i could identify it. at first i thought some motor noise might be ok, then it started smoking.... the back story was i had to convert a hot tank from 3 phase to single phase without a phase converter. the pump motor had a unique shaft and we were going to cut it and couple it to a single phase motor when i realized the motor housings were the same length. so i took the motors apart and made a single phase motor from the housing of the single phase motor and the shaft and one of the housing ends from the 3 phase but i didn't have the internal switch to kick out the start winding. do to a wiring mistake both coils were stuck on. now i know motors should be almost silent. good news is that aside from the varnish on the wires turning black there were no internal shorts or breaks in the wires and it still works after like 4 years of heavy service.