LECTURE PRESENTATION

Reading Assignment

• 26.1 Introduction to Numerical Control
• 26.2 Basic Principles of Numerical Control
• 26.3 Machining Centers and Trends
• 26.4 Ultra-High-Speed Machining Centers (UHSMCs)
• 26.5 Summary

Related link: TECH 4476 – Computer-Aided Manufacturing

Outline

Advantages of CNC

• Fast
• Accurate
• Repeatable
• Agile/Adaptable
• How CNC Works

CNC Terms

• Program
• Binary
• Word/Address Format
• Block
• Controller
• Motor
• Open/Closed Loop

Motors

• Stepper Motors
• Servo Motors

Motion Control

• Leadscrew
• Backlash
• Ballscrew

CNC Programming

Coordinate Systems

Rectangular Coordinates

• Linear Axes
• Right Hand Rule
• Other Axes

Linear Moves

Absolute vs. Incremental Coordinates

Coordinate System Offsets

Codes and Addresses to Learn First

•X, Y, Z, A, B, C, U, V, W
•These take a numerical value 2.0
•The decimal point is important
•2.0 does not mean 2
•G00
•G01
•G54-G59
•G90
•G91
•N

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