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Originally Posted by timothale
I worked at a company that made oem exhaust systems , mufflers and Misc parts for Harley, Our cnc bender used a mandrel (egg shaped internal dies on a SS cable) that was pulled thru the tubing as it was bent to give the smooth wrinkle free surface. a lot of the tubing had to be annealed and the weld in the correct position to get good pieces.
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That was worth resurrecting this old thread, VERY intresting.
Brian