Bending with an elliptical shaped tube groove can eliminate the need for a mandrel, but comes with some cost. (Center Line Radius), and material and product specs. It is a very specific solution which depends on tube O.D., (Outside Diameter) wall thickness, C.L.R. Elliptical Tube Grooves for Bending Without MandrelsĮlliptical bending is not for every situation. The key thing to remember about bend dies is that the more versitility designed into a tool, the fewer things it can do well. For a versatile tool, different length inserts can be made to change grip lengths. Inserted bend dies have a replaceable grip section to avoid replacing an entire bend die. This design is also helpful to add in support. A platform bend die accommodates a small center line radius, thereby eliminating the center stud.
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