I found this technique for forming dual cone mufflers, it looks like it should work with reasonable consistency after a couple of trial runs.
One immediately apparent change I would make is to weld the bottom blank plate to a flange to hold it down very securely. I'm quite wary of contained compressed air these days due to an incident with a stubborn fibreglass mould and a hollow wooden buck, but that's a story for another day.
Hidemo
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2 comments:
I dont like to use fibreglass moulds on something like this
Um, ok, that's probably why it's made by forming steel.
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