Full Version: Failed Experiment with PMC
From: Rodney Gold (RODNEY_GOLD) [#2]
6 Nov 2005
To: nick (STUDIO-N) [#1] 9 Nov 2005
You can do this with a laser without using that stuff , essentially you make a master out of anything that can be engraved and withstand either Room temeperature vulcanising rubber or Spin casting rubber that is vulcanised with heat. For spin casting , pex is fine , the master gets destroyed and the mould is perfect , the item can then be spun cast in low melting point stuff like tin , pewter , zinc based casting metal etc.
For the other process (lost wax) , you can use ANYTHING that engraves well and then make a mould in a rubber that cures at room temp , VERY easy to do. You then use the rubber mould to cast multiple wax items and you put these wax items on a sort of tree and cast plaster of paris around them , the plaster of paris or investment material is then put in a furnace that melts all the wax which comes out the trunk of the tree , the empty cavity is now filled with molten precious metal and when cooled , you break away the plaster of paris and you have a metal tree with the items you can pick off.
I do 100's of masters for the spin casting industry in perspex.