To: Abathar
Also, the moulds from that era were milled out of steel and were a major investment for the model companies (I have read about “average sized” moulds costing $150,000). The moulds are still expensive, but a lot of them are electrically milled copper or copper alloy (according to the model biz publications).
95 posted on
01/09/2008 6:39:03 PM PST by
Army Air Corps
(Four fried chickens and a coke)
To: Army Air Corps
It’s called EDM machining, you machine an electrode out of either copper or graphite and charge it in a tank of dielectric fluid and it arcs between the electrode and mold, disintegrating the mold. Takes a while, but it about the only way to get sharp internal corners in the mold without inserts, and on tiny pieces thats not an option.
105 posted on
01/10/2008 4:46:41 AM PST by
Abathar
(Proudly posting without reading the article carefully since 2004)
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson