I have a MT5 headstock on my lathe. I am toiling with the idea of
buying a MT3 collet chuck and a set of ER40 collets. I want to use a
MT5 to MT3 adapter between the spindle and the collet chuck. The
unknown is the combined runout of the MT5/MT3 adapter plus the chuck
plus the collets themselves. If anyone has been down this road, I'll
appreciate their opinions. Specifically, what runouts are you able to
achieve with this combination system? Thanks for your responses.

Garen Avanessian