Use this calculator to help bend curves on the tubing roller. Put in the diameter of the circle you want to make then decide how many pipe segments you want to use then use the calculator to tell you how far apart the ends should be after you curve it.
when using the tube roller the last 6″ on each end of the pipe is not usable so start your measurements 6″ from the end of the pipe. So a 10 ft pipe can yield a 9 ft curve.
Circumference Calculator
Arc Length Calculator
Length Converter
Helium Balloons Calculator