Useful Information when bending Tube
CLR = Centre Line Radius.
DOB = Degree Of Bend.
Length of tube in a bend = CLR X DOB X .01745
or, to put it another way:
L = (R X .01745) x Z,
L is the length,
R is radius of the pipe bend,
Z is the angle of the bend.
Setback = radius X tangent ½ angle of bend.
Circumference = 3.1416 X diameter.