Formula for making precise PIE CUT BENDS............!!!!

To make precise pie cuts bends I have provided a nice simple formula.
This formula makes a bend that is whatever angle you desire.

CLR = Center Line Radius (radius of the bend measured through the center of the tubing)
D = Diameter of Tube _____
L = Length of long side of pie cut - the top of this pie cut -> \____/
Angle = angle to cut pie section which, this angle is measured perpendicular to the length of the tubing
Bend Angle = The angle of the bend
N = number of pie sections to complete bend
* means multiply

L = [ ( 2 * CLR ) + D ] * [ sin ( Angle ) ]

Angle = Bend Angle / ( 2 * N )

Example:

You want to make a bend that is 120 degrees, uses 3" diameter tubing with a CLR of 4", and 5 pie sections.

Re: Formula for making precise PIE CUT BENDS............!!!!

Quote:

Originally Posted by CSaddict

My formula is eyeball x pipe / radius of the imaginary pipe in my mind= close enough.

Lol that's how I used to do it at first, then I smartened up. Framing square ftw, has all the angles on there. I just figure out how many bends I want to make the turn and find what angle it'll be for them with the square.