ER16 Collet Chuck for Unimat M12X1 Spindle

[Paul Jones]

Doug,

I think I just found a way to make the ER16 collet chuck with minimal run out. Tonight I mounted the ER16 on my Unimat SL spindle and took a couple thousands off the chuck OD. I cycled collet on and off the chuck about a dozen times and measured the TIR of the chuck OD. Each time the TIR measured less than 0.0002". This means I can rotate the Unimat head 6 degrees and use my Dremel tool holder and small grinding stone to dust off the ER16 ID taper surface. I am sure I can significantly reduce the TIR of the ER16 collet surfaces using this technique for the collet.

Paul