Metal casting pattern making, for a zither style banjo.

In this video I make a couple of patterns for metal casting. They're hopefully going to be used to build a banjo. The patterns themself work fine but I haven't had success casting the parts as of yet.

John's channel. Good detailed videos on machining and casting.
http://www.youtube.com/user/doubleboost/videos

Ronald Walter's inside diameter sanding jig.
http://www.youtube.com/watch?v=omYYshYj-NY

Видео Metal casting pattern making, for a zither style banjo. канала Daniel Grundel