Summary for bronze medals from gypsum Discussion
Bronze medals from a gypsum negative are the focus of this thread, with Peter van Summeren asking how a plaster/gypsum model is turned into a conductive form and then cast, and where to learn the process. One reply says the US Mint webpage describes the process most accurately, suggesting it as the best starting point for practical information. Another contributor, James M Marr, notes that pantograph machines and CNC milling are the closest equipment he has found for making highly detailed 3-D and raised-text items, but says manufacturers have not shared their methods. A third answer from Three Hawks recommends researching lost-wax and sandcasting as related processes. Overall, the discussion points readers toward official mint information and general casting references rather than a single detailed how-to source.
Q. Dear Sir,
I would like to know how they make medals from a gypsum negative. I myself do the rough design first in clay, second I make a negative in gypsum. After this, I do the fine work (details, letters). I often go to Eastern Europe and there is some master who makes from this a bronze medal. I would like to read some book/leaflet/article which describes the process. I am sure that about this subject much has been written, but where to start first? I do not want to be a chemist, it interests me to know how the model can be made conductive, how dangerous it is, etc.
With friendly greetings,
Peter van Summeren
– Haarlem, The Netherlands
2002
A. The US MINT WEBPAGE-describes process most accurately. I have been searching for information on the same processes. I want to make highly detailed 3-D images along with high relief text and raised text for belt buckles, keychains, medals, jewelry, etc.- The closest machines that perform these operations are a pantograph machine and CNC computer milling machines. However I have not found a manufacturing company willing to share their process with me. Any information that you can provide would be most appreciative.
Thanks,
James M Marr
– Richmond,VA, USA
A. Research lostwax and sandcasting
Three Hawks
– Wmpt, Pennsylvania