A tool device used to provide internal support to the pipe to prevent excessive flattening, collapse or wrinkling during rotary draw bending. It is supported by a mandrel rod that runs through the pipe ID and is held in location at the bend die.
Knowing and appreciating the craft of metal fabrication - by Tim Heston The recipe for precision metal fabrication includes technology and craft. We hear a lot about the technology, but not so much about the craft.
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