By: Jon H - 25th November 2009 at 01:18
shrinkage allowance off the original casting when used as a pattern can vary depending on the thickness etc of the structure [anything from 3-6%]…..but if you have the skill and foundry practice and are using “old” ways of producing the mold boxes then that can be fiddled ….allowing very close dimensional reproduction of the new casting
Thanks for that 🙂
Jon
By: geoff browne - 25th November 2009 at 01:16
shrinkage allowance off the original casting when used as a pattern can vary depending on the thickness etc of the structure [anything from 3-6%]…..but if you have the skill and foundry practice and are using “old” ways of producing the mold boxes then that can be fiddled ….allowing very close dimensional reproduction of the new casting
By: Jon H - 25th November 2009 at 01:00
You make the mold slightly bigger. Can’t remember by how much though. It has been thirty two years since I cast anything!
Rgds Cking
Indeed you do!
However the implication, to me anyway, is that the old original one was used as the pattern so either the new casting is slightly smaller or some other technique has been used to help compensate.
Jon
By: Cking - 25th November 2009 at 00:45
Out of interest, how have you compensated for the metal shrinkage in the newly casted part?
Jon
You make the mold slightly bigger. Can’t remember by how much though. It has been thirty two years since I cast anything!
Rgds Cking
By: Jon H - 25th November 2009 at 00:33
Out of interest, how have you compensated for the metal shrinkage in the newly casted part?
Jon
By: piston power! - 25th November 2009 at 00:19
Top quality the list is endless.
By: Peter - 24th November 2009 at 21:46
It just amazes me how parts like this can be recreated..!
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November 24, 2009 at 5:54 pm