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Author Topic: Simple and cheap replacement punch for chain breakers  (Read 2262 times)

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Offline pete

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Re: Simple and cheap replacement punch for chain breakers
« on: June 15, 2012, 10:49:01 pm »
Worked in a foundry for a while when I was younger and we used to dunk almost white hot manganese mix  rock crushing mandrels into cold water.  They used to knock them out of the mould and pop em straight into the furnace while they were still hot, keep em there for 20 to 30 hours around 1.500 degrees f, then cold dunk them ,  what used to go bang was the big pieces of resin mix sand that was used  as the mould
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