Been struggling with this for a while now.
Having a rectangular block I want to mill a groove whose bottom direction is inclined to all sides at angles A, B & C (angles measured in the planes of the sides of the block).
If I am correct the first two steps are:
With the sine vice jaws vertical clamp the block rotated in the vertical plane of A such that top surface makes angle A with the vice base plane.
Tilt in the vertical plane the sine vice jaws to angle = atan (tanB x cosA)
Now comes the part I can't figure out. I need to set the vice base at some angle in the X - Y plane (a function of C, A and B) to the X axis of the mill. What is this function?
Help, corrections much appreciated.
John.