Their is formula given in a code i think SP-32
L=N*Pie(D+d)+8d
L=Length of Spiral rings
N=Number of Spirals
Pie=3.142(constant)
D= Diameter of pile cage(spiral C/C)
d=diameter of bar
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Consider it as cylinder..
infinity
screw
Threads.
There are actually five kinds of curved lines: convex, concave, S-shaped, scallop, and spiral.