Friday, July 23, 2010

Grinding the rough casting


Here is the rough casting with the gates still on (the gate, or button, is the nub that remains after the sprue is cut off... what's a sprue? It's the tube where the metal flowed into the ring)



I use a file to remove the light grey crust that forms on the casting when it cools. I also use it to shape the ring and true up the overall form.


My flexible shaft, or flexshaft is the best tool a goldsmith has. You can put different grinding and sanding tools in it to smooth the surface of the ring before polishing. This one is a silica based abrasive called a grey wheel.

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