Safe Z : It's the z coordinate where the tool is safe , where it can't collide with anything ( fixture , stock , ..)
Start Z : Is the reference z coordinate. Usually it's the zero part Z0
Parallel strategy ( traditional ) :
Direction Auto : The direction is calculated automatically
Direction Horizontal : The direction is parallel to X axis
Direction Vertical : The direction is parallel to Y axis
It process multiple passes in z direction to remove all the material to remove.
The passes depth is determined by the tool cutting data parameter. ( Max Cut Height )
Material to remove : Measured from Start Z to Z+
Roughing Mode : It's the selected strategy
It perform the last finish pass on the part face.
Finishing allowance : It's the material left by the roughing operation