Introduction to CNC: Page 4 of 4

PRINCIPLES OF CNC

Point to Point Systems

The point-to-point (PTP) control system is many times referred to as the positioning system. The primary function of the PTP control system is to move a tool from one point location to another specified point, generally to do hole operations such as drilling,boring,punching,reaming and tapping. The path the tool follows may be one of three paths, depending on the control being utilized.

Continuous Path Systems (Straight Cut and Contouring Systems)

The continuous-path control system is more commonly known as the contouring system. Its function is to synchronize the axes of motion to generate a predetermined path, generally a line or a circular arc. The contouring system has the capability of controlling its drive motors independently at various speeds as the tool moves towards the specified position. This involves simultaneous motion control of two or more axes which requires separate position and velocity loops.

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