In the Stepdown Strategy area, choose whether to scale the toolpath to fit the curve or translate the toolpath to the surface:
Scale — This strategy scales the curve so that the whole length of the vector is machined on each pass. 
Translate — This strategy allows for faster, more consistent material removal. Each stepdown is offset from the previous curve to reduce unnecessary tool movement.
- Extend above Start Depth — Extends the toolpath beyond the block where it reaches the start depth. This ensures the tool completely leaves the block if your material has a non-planar surface.
