09-05-2005, 07:26 PM
Hi Jeff
hmm o.k. this is a special kind of rubber where your orignial part is placed in between. On the original or model there is added a short piece of wire, to form the channel in which later on wax is injected.The rubber is vulcanised at about 120°c and 6bar presure.
After that your form is opened, your original or model taken out.
Special casting wax is under presire injected in the rubber form. The so created wax pieces are then sodderd onto a thick wax stem which is mounted to a plate. your wax pieces and stem are then covered with a special steel flask used for casting. This flask is then filled with plaster, this has to be bubble free. After the plaster has hardend you remove the plat holding your wax stem. Your plater filled flasks are then put in an oven and slowly heated up to the temperature need for brass, during the heating your wax melts leaving cavities behind where your metal will later on be filled into.
When you have reached your temperature you cast your metal remove
what is left of the plaster, and sodder your cast piece onto a sturdy brass rod which then acts as your punch.
I know this is a lot of specialist stuff that goldsmiths use, not what most would have at home. But if you are into making series of stuff this is a rather fast way, even though for a single piece maybe on the whole a longer way of doing something. Most who are into making replicas like Erik, Markus Neidhart or Holger Ratsdorf all use this method. Haven´t heard of anyone unhappy with the results!
Hope this gives you a better idea?
Martin
hmm o.k. this is a special kind of rubber where your orignial part is placed in between. On the original or model there is added a short piece of wire, to form the channel in which later on wax is injected.The rubber is vulcanised at about 120°c and 6bar presure.
After that your form is opened, your original or model taken out.
Special casting wax is under presire injected in the rubber form. The so created wax pieces are then sodderd onto a thick wax stem which is mounted to a plate. your wax pieces and stem are then covered with a special steel flask used for casting. This flask is then filled with plaster, this has to be bubble free. After the plaster has hardend you remove the plat holding your wax stem. Your plater filled flasks are then put in an oven and slowly heated up to the temperature need for brass, during the heating your wax melts leaving cavities behind where your metal will later on be filled into.
When you have reached your temperature you cast your metal remove
what is left of the plaster, and sodder your cast piece onto a sturdy brass rod which then acts as your punch.
I know this is a lot of specialist stuff that goldsmiths use, not what most would have at home. But if you are into making series of stuff this is a rather fast way, even though for a single piece maybe on the whole a longer way of doing something. Most who are into making replicas like Erik, Markus Neidhart or Holger Ratsdorf all use this method. Haven´t heard of anyone unhappy with the results!
Hope this gives you a better idea?
Martin
