On Tue, 31 May 2005, Bradley Ferguson wrote: > On Tue, 31 May 2005 19:41:45, Roland wrote: >> RF? Just use mains frequency. >> >> Run a number of thick turns around it and switch on ;) > > I wonder how that would work. My inkling is that it would heat the > coil more than the part, assuming that it was current limited. I > imagine the part is fairly ferrous, though, so it would be very much > like a transformer... > > There is some used equipment (~12.5K USD) on the Ameritherm website. > It only goes down to 50kHz and delivers 3kW. 3kW is not nearly enough. A small handheld type torch is 3kW. He needs something in the 30kW range probably. If I understand it right, at the time they would pack the receiver end (with a hole about the diameter of a man's thigh for a crank pin) into a basket with hot charcoal and leave it there until dull red. Then they would hammer the pin in using huge hammers and something in-between to prevent marring the pin. There is no telling what this does to the heat treatment of the part (if any, since it's Victorian technology). Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist