COMPUTER NUMERICAL CONTROL PROGRAMMING BASICS
COMPUTERNUMERICALCONTROLPROGRAMMINGBASIC SA Primer for theSkillsUSA/VICAChampionshipsSteve Krar Arthur GillDistributed to educational administrators,instructors, students, and apprentices with the compliments of INDUSTRIAL PRESS, of MACHINERY S HANDBOOK The Bible of the Machine Trades ComputerNumericalControlProgrammingBasic sSteve Krar Arthur GillThis book is not intended for sale under any PRESS Madison Avenue, New York, NY 10016CONTENTSSECTIONPAGEForeword1Preface 7Cartesian Coordinate System7Machines Using CNC9Programming Systems11Point-to-Point or Continuous Path13Point-to-Point Positioning14Continuous Path (Contouring)15Interpolation15Programming Format17Programming for Positioning23Work Settings and Offsets26CNC Bench-Top Milling and Turning Centers30CNC PROGRAMMING Hints Milling32Milling and Drilling Programming34CNC Program
When points are located on a workpiece, two straight intersecting lines, one vertical and one horizontal, are used. These lines must be at right angles to each other, and the point where they cross is called the origin, or zero point (Fig. 1) Fig. 1 Intersecting lines form right angles and establish the zero point (Allen-Bradley)
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