On Thu, 30 Oct 2008 14:38:27 -0700 (PDT), "Ricardo D. Medina"
wrote:

Hi,

I just bought a 6" 4 Jaw independent chuck for my Myford ML7, but I
can't get a backplate around here. What steel would you suggest I use
to make one? I was thinking along the lines of 4140, but if 1045 is
alright, it's easier to get here... Any ideas?

Thanks!

Ricardo Medina


Contrary to the cast iron recommendations you will get I have, over
the years, made a number of "back plates" for various size chucks,
usually to allow a chuck to be used on a lathe with a different size
spindle. I have always used plain old steel - whatever was available
in the scrap barrel. In fact I frequently used thick walled steel pipe
or tubing, threaded it to fit the spindle, welded a flat plate to it
and then re-mounted it on the spindle and machined it all over to fit
the chuck. Never had a problem with them and some of them were still
being used the last time I visited home forty years after I made them.

Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)