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I have a circular helix with any point on the helix defined using the Frenet tnb triad.

t- tangent, b- binormal and n-normal acting towards the axis of the host circular cylinder.

The tangent of the helix t is oriented at angle A with respect to the base of the cylinder.

Now I want to convert the tnb coord system to the cylindrical coordinate system, RTZ. I need it because the cylinder has to be defined in terms of RTZ.

I came up with this:

R = -n

T = t cos(A) - b sin(A)

Z = T sin(A) + b cos(A)

Is this correct? (T is implicit in RTZ for representing a helix in cylindrical CSYS). I am confused. Any help would be appreciated. Thanks

-C

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# Helix in cylindrical coords

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