![]() ![]() Once you have the jig body assembled, find the center and put a half circle on it with a compass as show below. You will find out most of the time it’s a little greater than “theoretical”. To get the inside width of the u-bend you can calculate it as 1.5xDx2-D, or measure it. U-bends will have a long radius bend of 1.5xD (diameter). The width of the jig will be the inside width of the u-bend. ![]() The thickness of the jig will need to be less than the diameter of the pipe. The jig body is built up from several pieces of MDF. You can see how I made the jig and how it works in the pics below. I get into the details later but in summary the jig helps you to cut your mandrel u-bend at the correct angle and in a manner such that the end view of the cut is round. The first one I did simply because I wanted to save a few bucks, the second time was because I was a long ways off before I had a road worthy vehicle.įor cutting the mandrel bends I have a jig I made up that works well for me. I’ve had a few projects in the past where I’ve built my own exhaust from mandrel u-bends. ![]()
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