Setup for grinding an ER32 collet chuck

[Toolmaker51]

Adding to what Toolmaker 51 said about thin tube I don't have a 6 jaw and would still do this even if I had one for machining thin-wall tubing when ever possible I make a snug fitting plug to insert in the tube then when I chuck the tube in my lathe the plug will keep the tube from deforming allowing for much better clamping from the jaws...Using plugs on a metal late just seemed to be a good idea to implement especially for production work

Another way are bushings, carefully bored to tube OD and split on one side, and cut some what on the other 180...
As usual, click the pic.