To figure out the inside radius and outside radius, subtract and add half the outside diameter to the centerline radius. Here are the selection and specs for 1-1/4” OD Round Tube Dies. We’re going to use 1-1/4” OD, 0.095” Wall, ERW Round Tube. We want the outside of the tubing to line up with the top corners of where the fender cutout is.
So for about $10, you can figure out which centerline radius is best for you before you spend a couple hundred dollars on a die. For this example, we’re going to be choosing a CLR to build tube fenders for a Jeep Wrangler JK. So how do you figure out which CLR is best for you? We’re going to show you! Whether you’re building a roll cage, a bumper, fenders, handrails, tuna towers, or anything for that matter, you want your bends to conform to the contour of where that tubing is going. Still, others might ask, “What’s the smallest CLR in that OD?” That might be important for some projects, but it’s important not to rush into getting the smallest CLR just because someone told you that’s what you need. Your project might be a little different than most guys, so it’s important to evaluate which CLR is best for your design, not the other guys’. One of the more frequent questions our technical sales team gets asked is, “What’s the most popular CLR in that OD?” For all of the common ODs, there usually is a popular CLR, but don’t let that influence your decision. We can help you figure out minimum wall thickness requirements, but figuring out your design is up to you. Sometimes, a single OD and wall thickness of your material, there’s only one centerline radius that can bend that material. For other materials like aluminum or stainless, it’s a little more tricky, but we can help you out with that if you drop us a line. If you want to bend ERW, we recommend going one gauge heavier on the wall thickness for quality bends. We break it down for each bender, each size material, and each centerline radius. If you want to bend DOM mild steel or chromoly, those specs are listed in the die charts on our website.
Figuring out the minimum wall thickness specifications is the easy part. When it comes to selecting a centerline radius (CLR) for a die, there are two things to consider: minimum wall thickness specifications and design.
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