Why do I get a taper when turning?

[irving2008]

I like guessing games :dance:

It's a Vee bed, n'est ce pas? If so I'd look at the saddle bearing face opposite the Gibb strip. Has it worn into a bow? If so no amount of tightening the Gibb will stop the saddle twisting and you have some scraping to do.

It is a vee-bed, the outer edges are angled at 60deg approx. The tailstock runs on the centre of the bed.

I haven't taken the saddle off yet. The gib strip is at the back so I assume that is where the wear will be, no? Is this a case of replacing the gib strip?

[Robin Hewitt]

I haven't taken the saddle off yet. The gib strip is at the back so I assume that is where the wear will be, no? Is this a case of replacing the gib strip?

The Gibb strip can bend, it's the other side that may be the problem.

Suggest you loosen the Gibb, seize the saddle with both hands, shove it hard up against the Vee on the non-Gibb side of the bed and then twist it.

Does it rock or does it roll? You should be able to feel if the contact face has bowed.