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Helix in cylindrical coords

  1. Jun 14, 2010 #1
    Hi all,

    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

  2. jcsd
  3. Jun 15, 2010 #2
    Anyone? Please...
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