I am drawing a helix with extensions in each end (inlet outlet pipes to a coil for a heat exchanger). I would like the part to work parametrically or be able to make multiple configurations. So I should be able to adjust the number of coils, spacing on the inlet, outlet. etc.
The problem occurs when I change a parameter such as the number of rotations on the helix to non-even numbers to test the part and evaluate different configurations, The helix and the inlet/outlet lines are connected with curves that have a tangent constraint. For some changes, the lines turn 180 degrees so that they converge on a tangent point instead of continuing smoothly from one curve to another. An alternative (and valid) tangent solution to the constraints would give the correct geometry.
Included are 2 part files. "Condenser Coil 2.sldprt" is correct. For "Condenser Coil 3.sldprt", I changed helix revolutions from 10 to 9.75. The problem is at the bottom of the coil.
Any ideas on how to force the correct solution?