On Mon, 12 Dec 2005 22:48:37 -0500, "Bob Chilcoat"
wrote:

I may actually never have tried to machine actual cast iron before (except
for drilling and tapping a few holes). I have machined plenty of mild
steel, however. I guess that's a different animal. I'm not sure what this
is, but I'm willing to concede that it's probably cast iron. The Browning
taper-lock hub, OTOH, is almost certainly a powdered metal part. It is
clearly molded with mold parting lines and fine detail. Not sand cast or
what I've ever seen from cast iron. That's what led me to believe the
sheave was PM too. Live and learn.

Yes they've been making the hubs out of powdered metal for a few
years now. I've not seen a pulley made that way yet but just give them
time and they will.

If the powder was dark gray then it was probably cast iron.

Wayne Cook
Shamrock, TX
http://members.dslextreme.com/users/waynecook/index.htm