In our case, it is a priori the machining process that defines the orientation of the Z axis and therefore the spindle axis.
Horizontal Z turning, vertical Z vertical turning, vertical Z milling, ...
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Hello,
Let's say that I think that SW was based on most of the pure 2D software (Autocad at the time, Vellum for those who may have known) which was based on a front view in X/Y (as for any representation in the Cartesian coordinate system x x-axis, y-axis) so the Z ended up in the plane of depth by default.
The rapprochement between SW and Catia is " recent " and changing all the logic seems complicated to me, especially taking into account the old files that should not explode in flight (which is not the most stable according to the version jumps that are already basic)
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SW was born in 95 (software and was already in 3D
That said, I agree with you, the X and Y axes were the axes of the 2D, with the Y being the vertical. The 3D created an intoxication on 3 axes so the Z was either horizontal to change nothing or vertical for more recent software.
In short
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