Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
You need a big boy lathe Crueby.An advantage of these is that you can make or buy additional top jaws and bore them to clamp thin work. In addition, bored soft jaws center repeatedly as long as the chuck remains mounted, even if the fixed jaws have some runout.The first set of soft jaws I made myself from aluminum bar, but since then I ordered a set from monsterjaws.com. The "tongue and groove" dimensions that fit the jaws to the lower jaws are standardized in both American and metric sizes.