Fourth casting - Pulley
by, 06-17-2011 at 08:17 PM (2908 Views)
Thanks Anon for your working on the forum migration.
I needed a pulley for the new mill head I am building. The pattern came out taller than my cope.
To lower the spilt line I molded a pot plant tray.
I made the pouring spue too thick, and it poured a bit short. I am still pouring too hot, as you can see the surface finish improving, from very rough on the sprue, to quite smooth on the hub.
Luckily I was generous on the machining allowance on the hub, as I got a lot of shinkage and voids. The bore will be 35mm (the hub is 50mm diameter) so that big void should clean up.