Hi

I'm trying to create a complex swept cut - to be used to thread a cooling pipe.

Attached is a very simple example part that demonstrates what I'm trying to achieve.

If you look into the Cut-Sweep1 you'll see a 3D sketch, which demonstrates two changes in height.

1) tangent arcs (ok ish) 2) a spline (horrible things, like trying to tame a viper)

My part is a lot more complex with arcs changing in two directions, eg curve down whilst curing to the right.

Really struggling with the guide curve geometry trying to keep constant arcs and tangents

Could anyone suggest a better way of doing this?

Regards