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Old April 20th 08, 07:01 PM posted to rec.crafts.jewelry
Heinrich Butschal[_3_]
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Posts: 21
Default Investment Castings problem -- surface defects caused by ...?

Séimí mac Liam schrieb:
Paul Wilson wrote in
:

www.eliasbing.com/surface_defects.html


Why aren't they being die struck, if I may ask?

Very often this won´t help.
More important is the thickness of the casting sprue and the mold/metal
temperatures.
Here you find a ppt presentation. At slide no 7, there is a picture of a
casted silver coin underneath a casted part of a watchband-clip. The surface
is completely even nearly like the original coin.
http://butschal.de/download/Karlsruh...Bu tschal.ppt


Mit freundlichem Gruß,
Heinrich Butschal
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