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Foccacia
7th October 2012, 06:52 PM
Hi all
I've made some moulds suitable for casting a low temperature tin/copper alloy. The problem is that the casting has a raised section at the top due to the surface tension of the alloy (similar in appearance to the old mercury thermometer). I want the alloy to be flat at the top of the casting. Any suggestions apart from filing the surface?
Cheers
Foccacia

joe greiner
7th October 2012, 10:00 PM
If the shape permits (hint: post a picture of your pattern), I would use a two-part mold to include the top surface as confined. Set the top surface sloping upward toward a riser. After casting, cut off the riser.

Depending on the shape (hint: post a picture of your pattern), a different orientation might work better, with the riser elsewhere.

Cheers,
Joe