Bending tubing with less than the minimum wall thickness can result in wrinkling or breaking. The minimum wall thickness required to make a nice smooth bend depends on the OD and CLR. What range of wall thicknesses can a particular die set bend? A smaller CLR will produce a tighter bend. Divide the center line diameter by two to get the center line radius. If you bend a piece of tubing 180 degrees and measure from the center of one side of the tubing to the center of the other, you will have the center line diameter. The center line radius refers to the distance from the center of the die to the center line of the tubing. OD refers to the outer diameter of the tubing or pipe to be bent. How are die sets measured?ĭie sets are measured by outer diameter (OD) and center line radius(CLR). Please note, delrin inserts are not available in square die sets and therefore, we can not guarantee that aluminum will not be scratched. We also recommend our special delrin inserts when bending aluminum to prevent scratching. If you are using aluminum, please contact your supplier to determine if the grade you are working with is bendable. 316 Grade Stainless Steel can not be bent. DOM, Chromolly 4130 and 303 or 304 Grade Stainless Steel can also be bent. The most common material is mild steel, which is why you will find minimum and maximum wall thicknesses based on that.
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