Because the exiting 3D Profile machines to down in Z direction like
defined cutting length NC data by given curve, so cutting width is changed according to cut angle. Although tool moves 3D curves, in case of machining from bottom to upper or from upper to bottom, this slope become
lager and then machining length become smaller.Normal Offset function is always making NC data for maintaining machining width regardless of aslope of 3D curves.
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