soft metal to make detailed prototypes?

[xaco]

hello everyone, i am making jewelry prototipe for rubber vulcanised mould to inject wax.. i am looking for a soft metal,machinable,that leaves good detail using carbide V-bit(angle 15°,tip-0.1mm) that can withstand temperature of 190° celsius and some pressure from process of vulcanisation of rubber. even Acrylic would be good if was not melting on about 160°celsius..... what metal can be milled with cheap hong kong V-bits i mentioned and at what speed and feed rate? Thank You

[awerby]

It's soft and easily machinable, and it should be able to take vulcanizing temperatures (the melting point is 232 C, 450F). It's been used traditionally in the jewelry trade for hand-carving models that are later vulcanized. Use a little oil when cutting it, so it doesn't stick to the cutters. Feedrates and rpms really depend on the size and type of cutters you're using - I'd start slow and try going faster if everything's working okay.

Andrew Werby
www.computersculpture.com

[xaco]

Originally Posted by awerby It's soft and easily machinable, Andrew Werby www.computersculpture.com

sounds interesting,i dont think i can find pure tin to buy,only those wires for soft soldering,but they r mixed and very soft,taht wouldnt sustain pressure when 0.4 mmm thick....thx for advice,i will seee what can i get