I have designed a new main tube mitering jig that is based off of the center to center measurements of the 3 tubes. This new mitering tool is called the Simple MTMJ and is exactly what it sounds like. A mitering system that is simple, uncomplicated, straight forward and inexpensive. This jig does not require a rotary table or large milling machine to set it up on. Using the center to center measurements found on BikeCad and most other frame building programs a builder is only required to clamp the tube being miter in the supplied tube blocks using the set-up beam which locates the tube blocks in the correct location to cut the tube to the right length in one try. Once the tube is clamped in the blocks it can be placed in the custom made rotary base that will clamp in a standard milling machine vise. Depending on if you are using the digital or analog version of the rotary base the tube miter angle is set using a protractor or the digital protractor built into the base. once the angle is set the first miter can be done. To finish the tube it is flipped in the rotary base and the second miter is done. The bed of your machine does not need to move between cuts and the the tube is cut to length perfectly every time in one try.
The Simple MTMJ comes with 4 pairs of block of your choice , a set-up beam and the rotary base. To keep the cost of the tool down and increase the holding power of the blocks they come unanodized. All other parts of the tool that receive wear hard black anodized.
A version of the jig is available for builders who already have a rotary table and want to use it.
digital version of the Simple MTMJ is $1100.00
Analog version of the Simple MTMJ is $800.00
Rotary table version is $600.00