On 23 Mar 2006 19:34:35 -0800, "John2005"
wrote:
snip
Regarding F. McDuffee's suggestion about the laminated cam, how does
this help with contact stress issues ?
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Only by making it easier to manufacture a wide cam which can
increase the contact area and reduce the stress. How many of
these do you need?

If only a few wire edm on the outside and plunge edm for the
center and tracks may be the way to go. Use any material that
you like, even HY110/HY150 or some of the powder tool steels such
as CPM10V. Pre-heat treat to avoid/reduce distortion.