On Feb 4, 8:11*am, Ignoramus25542 ignoramus25...@NOSPAM.
25542.invalid wrote:
The cleanup of the lathe is basically done all around, the VFD is
wired the way I want and things are cookin'.

Got something else going on...

If I try threading, the half nuts would not stay engaged, they lose
this engamenent in a second or so. If I hold the engagement lever,
they they do stay engaged, but I feel the lever kind of bumping.

What would be the typical cause of this.

i

First things first. Have you ever cleaned them? I've seen half nuts
pack up with swarf and gummy oil so much that they would not engage
fully. A good cleaning may make them almost as good as new. Or not.

John Martin