Material should be thoroughly cleaned to remove all scale, grease or oil residue. Welded Bobber Chopper Frame by Luke Hudson, Australia. Now if the angles are correct and the final length is too long, you are probably okay, so just trim the excess. If the bend measurements are grossly incorrect, resulting in overall dimensional error, you have just created a piece of scrap. Any of these issues could hamper the assembly of the frame.īending tube comes with a unique set of problems that could cost a good sum of money in scrap material. Another problem could be the measurement of the bend angle, or rotation of the frame tube in compound bends. This could result in several problems such as overall length error, bend angle error due to failure to consider springback, bend deduction distance error for a given O.D. The biggest problem is inaccurate measurement, or selection of incorrectly sized tools for your bender. You will find, however, the pitfalls you need to watch out for in tube bending.
Chopper Plans manual#
If there is not a manual there, contact your vendor. That generally is supplied in the manual that comes with your bender.
Chopper Plans how to#
Bending tubing! This guide is not intended for step-by-step procedural instructions on how to bend tubing. Many builders use actual major components such as engine, transmission, rear wheel and front forks to ensure accuracy of alignment. As long as the jig base (parallel rails) and the vertical assemblies are perpendicular to the parallel base rails, accuracy will be achieved in the frame. There are four leveling adjustments on the feet extending out from the parallel rails.
Notice the adjustments that are available for the steering neck, rear axle plates and seat post. To the above right is an example of a builders Jig. If you tackle this job yourself, remember, it will always remain a "work-in-progress" as you fabricate your frame. To build a jig yourself, and I mean all the machining and other work yourself, you will have to invest anywhere from $200 to $700 in materials alone. In either case, the cost would be prohibitive to the small shop or the individual builder. The jig would have to be tailored to the bike design, or be infinitely variable. The beginning price could be anywhere from $5,000 upwards for an adjustable jig. Commercial chopper frame jigs are very expensive.
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