We recently received an inquiry on how we cut bends through the arc (remove the tangents). We basically do it two ways, with a Marvel, tilt frame vertical bandsaw or through a Conair up-cut saw.
With pneumatic pistons, the saw holds the bend snugly (notice a rectangular bend in this picture), and the upcut blade chips through the tubing (butyrate in this example).
The process is smooth and clean.
Here is the result: