Create a datum curve described an equation. Choose the coordinate system
and choose Cylindrical as the type. Then have an equation like
! setting the radius of the helical spring
r = 5
! setting the spring to have 10 turns of 360º
theta = t*360*10
! setting the pitch of the spring so that the spring starts 1 mm from the
xy plane, ends 3 mm from the xy plane with an increasing pitch (first turn
is at z = 1.02, second turn at 1.08, third turn at 1.18, etc. You can
write any equation in here to get the pitch you want.
z = 1 + 2*t^2
Note that 't' is a ProE variable is equal to 0 at the start of the curve
and 1 at the end. At least one of the equations has to be written in terms
of 't'.
--
Mark von Huben
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