The horizontal dimension of a rotary-draw bending clamp die or pressure die parallel to the cavity of the die block; the dimension of such a block from its leading face to its trailing face; the dimension of a such a block lying in the plane of bend and perpendicular to block’s reach corresponding to the Y-axis of the tube-bending machine. Usually the cavity length of clamp die or a pressure die is the same as the block length, but they can differ in the case of a notched die with a block length greater than the cavity length. For example, most models of rotary-draw tube-bender have a minimum block length for mounting purpose, but the cavity length must be shorter than that minimum length to accommodate the restrictions of the part to be bent (typically a multi-bend part with a short mid-tangent). So attention must be paid to specifying the length of clamp dies and pressure dies in these situations.
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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.