07-28-2016, 11:47 AM
When I bought my Logan it came with a Buck 6 jaw through adjust. The previous owner used a center punch to make a diamond pattern on both the chuck & the OD of the spindle for alignment/mounting. I've stuck with that & am more than pleased with repeat-ability, etc.
BTW, when I was taught how to make soft jaws we used a hardened disk to clamp on with the very back of the jaws and use the same procedure for regrinding 3/6 jaw chucks. This way the clamping pressure is in the same direction as when one would be holding a work piece. If necessary one can relieve the back of the jaws on a surface grinder. This was 40+ years ago and has worked well for me.
BTW, when I was taught how to make soft jaws we used a hardened disk to clamp on with the very back of the jaws and use the same procedure for regrinding 3/6 jaw chucks. This way the clamping pressure is in the same direction as when one would be holding a work piece. If necessary one can relieve the back of the jaws on a surface grinder. This was 40+ years ago and has worked well for me.