Introduction

When CAD/CAM systems are used, the NC program is generated by scanning of the original contour generated by the user. Depending on the CAD/CAM system, linear and/or circular blocks are then generated. Frequently, short blocks come into being within the range from a few millimeters right down to 1/1000 mm. Depending on the kind of workpiece, the contour either describes a relatively harmonious profile (not prismatic) and/or the contour contains corners or edges (prismatic), which must be contained and be recognizable as such in the workpiece. In the CAD/CAM system, the original contour is scanned by an algorithm with an error tolerance. The NC's task now consists of interpolating this set of interpolation points at the highest possible speed.

Introduction 1:
Figure 1-1: Scanning a milling contour curve (variant 1)
Introduction 2:
Figure 1-2: Scanning a milling contour curve (variant 2)

The possible machining speed and thus the production time depend on the following factors: