A specification for the arc of a tube bend, most commonly used with non-round tubing. (The centerline radius is almost always used to specify the bend of a round tube.) Physically, it is the innermost edge of bend; geometrically, it is the continuation of the inboard line of the tube into the arc.
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A complete guide to the principles of the 4-Step set-up for tube-bending tools
This is a printable handbook showing how to implement in four standardized steps the “forward mandrel” set-up for rotary-draw tube-bending machines and establish process control over the so-called black art. The procedure is based upon the guiding principle that the tools make the bend and takes advantage of the inserted design of modern mandrel tooling.