Check the belt cover. I've had the same prob on 2 different lathes. If
tightening the screws doesn't fix it, try putting thin neoprene or fiber
washers between the cover and the lathe.

"Denis Marier" wrote in message
...
My lathe is a low end Taiwan made with 3/4 HP and 1" 8 tpi.

The other day I was finishing a 9" OD maple bowl with a 3/8 X 1" scrapper
at
about 800-1000 RPM.
It worked well. Until I reached the 9" OD lip where the wall thickness
was about 3/8 thick. Then what seem to be the Headstock started to hum
at
low decibels.
I stopped and sharpen the scraper and checked the mounting. I then
continued with very gentle touch on the scraper removing minimum wood.
Still, the Headstock was humming. I changed the RPM with negative
result..
I am puzzled by this humming. I would appreciate comments as to what can
cause that humming sound.
-
Denis
Sprucewood, Rothesay, N.B