I am trying to create a helix based on the below footprint. The footprint is based on to intersecting circles that are joined by fillet. The resulting helix will be used to create balustrades and undercarriage for a stair. I therefore need to be able to control the start angle / point of the helix and the sweep angle / end point. The sweep angle should be able to exceed 360° and finally I would like to control the height of the overall helix.
In my mind I would have a spline that follows the “footprint” in regards to X and y coordinates with a specific incline to increase the z value along the length. Finally, by controlling the length of this spline I could extend it over the starting point.
I am open for any other suggestion of how to achieve this.