Trolled through the forum headings but could not see anything related to this question.  I have had problems turning longish shafts like loco axles in the lathe and getting an even diameter along the length. The problem is not with the lathe alignment which I have checked, the problem is the top-slide moving during the traverse. The lathe is a Sieg C6 and there appears to be no way to lock the top-slide in position while traversing the carriage along the lathe bed. Has anyone else had this problem? Currently I have to hold the topslide leadscrew handle during the cut which is awkward. The topslide leadscrew wants to move during the traverse and I can’t see how to tighten it. There is also a bit more backlash on the topslide leadscrew than I would like but I can’t see how to overcome this as the exploded diagram in the owners manual is a bit hard to follow.

I thought about tightening the gibs to lock it in place but then I would have to loosen them again after every traverse to return the carriage to the tailstock end ready for the next cut.

Any advice appreciated particularly from any Sieg (or clone) owners.

Thanks in advance