Chapter 7:

2D Milling Toolpaths

Upon successful completion of this lesson, you will be able to:

• Explain the difference between 2-½D, 3D, and 4-axis machined parts.
• Explain the difference between common CAD and CAM graphics views
• Identify 2D machining features based on part geometry and your knowledge of tools and 2D toolpaths.
• Identify commonly used machining parameters for 2D tool path operations.
• Explain the purpose, general parameters, and use of facing toolpaths.
• Explain the purpose, general parameters, and use of 2D contour toolpaths.
• Explain the purpose and rules for using Cutter Diameter Compensation (CDC).
• Explain the purpose, general parameters, and use of pocketing toolpaths.
• Explain the rules for slot milling toolpaths.
• Explain the rules for chamfer milling toolpaths.
• Explain the rules for radius milling toolpaths.
• Explain the rules for drilling and peck drilling toolpaths.
• Explain the rules for tapping toolpaths.

Contents

• 2D/3D/4X/5X Defined
• Standard CAD Views vs. CAM Views
• CAD Features vs. Machining Features
• Toolpaths by Type and Use
• 2D Toolpath Terminology
• Cutter Diameter Compensation
• Facing
• 2D Contour
• Pocketing
• Slot Milling
• Chamfer Milling
• Radius (Corner-Round) Milling
• Center Drill
• Drilling
• Tapping

Overview

CNC milling toolpaths are broadly classified as either 2D, 3D, 4-axis, and 5-axis, depending on the number of axes involved and how they move. The term, 2D, is a bit of a misnomer because all modern CNC machines control at least three axis and all three axes move at one time or another for every 2D machining operation. A more accurate term, 2-½D, is commonly used in CNC manufacturing.