![]() Three: The machine forces this excessive outlet (straight) tube around the mandrel by either rollers on the outside of the tube or a sliding second mandrel, levering the tube around the mandrel.Īs pointed out above, the material in the tube itself yields both on the outside and inside of the tube, but NOT equally. A second straight part of the tube must continue past the end tangent of the bend. Two: The inside radius of the bend is determined by a mandrel at the centerline of the bend: OD/2 of the mandrel = IR of the bend. For my wrought iron bending, I only need 3-6 inches. Length of the inlet straight is determined by the shop's machine. One: First, an inlet straight part of the tube is clamped in the machine by either a vise, or forced against an anvil sized to the outside of the tube steel. Please don't scrimp by sending them the exact length: They won't be able to use any of the tubing delivered.Ĭonsider the physics (or mechanics of the machine doing the bending the square tubing. ![]()
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