Hello, We received 2 used Hwacheon 400 lathes a few months ago. I am trying to get them going but I have the same issue with chatter in both machines. All of my chatter issues are at the tailstock end of parts. We've checked everything imaginable and can't seem to correct it. Here is some info on what I'm doing...

MACHINE #1)8620 mat'l 20" long 2" shaft with s/r and face driver. When turning 2 brg bands @ t-stock end we have chatter.

MACHINE #2) 4340 mat'l 30" long 4.5" shaft between chuck and center. tailstock end has mammoth chatter but from center into chuck cuts smooth.

We have tried 3 different centers and we've been all up and down on hydraulic pressures?

Any help would be appreciated....signed, frustrated!