Looks like some mild chatter
Or cut isnt deep enough.
No chatter but a very fine cut.
I suppose with carbide needs to be deeper?
Fed by hand then only had traverse away from the spindle at that pointNow that is a proper cut!
I have realised that whilst there is virtually no wear on the bed or anywhere else there is a bit of slack on the cross slide. Just A bit. I assume the bronze nut needs replacing. Under load I am guessing it is fine but under light loads perhaps not?