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📘 How CNC Machining Works

A CNC machine is a programmable machine tool that removes material from a workpiece.

5
lessons
~25 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. The Machine Has a JobDistinguish CNC milling and turning and explain how axes describe programmed motion.CNC machines remove material through coordinated motion. Milling rotates the cutter; turning rotates the workpiece.
  2. From CAD to G-codeExplain how CAM produces G-code blocks and why modal commands require deliberate program setup.CAM converts geometry into operations and tool paths, then a post-processor writes controller-specific code.
  3. Setup Creates the ReferenceExplain workholding, work offsets, and the coordinate relationship between machine and job.Stable workholding and a measured work offset connect program coordinates to the real stock and fixture.
  4. Cutting Is a Controlled TradeoffRelate tool geometry, speed, feed, roughing, finishing, and coolant to cutting performance.Tool choice and cutting data balance chip formation, heat, rigidity, surface finish, time, and tool life.
  5. Inspection Closes the LoopUse process clues, tolerances, measurement, simulation, and first-run verification to close a CNC workflow.Inspection and controlled troubleshooting turn machine output into evidence for improving the next run.

Questions this course answers

What does CAM primarily add to a CAD model?

CAM turns geometry into operations and paths that account for tools, stock, and cutting conditions.

Put the setup-to-inspection sequence in order.

The reference and tools must be established before motion, and measurement checks the result afterward.

Match each choice to its direct role.

Each item controls a different part of the manufacturing plan: material removal, reference location, or motion rate.

Grounded in trusted sources

  • LinuxCNC, G-code Overview: https://linuxcnc.org/docs/html/gcode/overview.html
  • LinuxCNC, G-code Quick Reference: https://linuxcnc.org/docs/html/gcode/g-code.html
  • LinuxCNC, Important User Concepts: https://linuxcnc.org/docs/html/user/user-concepts.html
  • Haas Automation, Mill Operator's Manual, Programming: https://service.haascnc.com/sites/default/files/Locked/Manuals/Operator/2016/Mill_Operators_manual_96-8210_Rev_A_English_April_2016.pdf
  • NIST, Digital Twin Lab: Supporting Research and Development for Standards and Implementations: https://nvlpubs.nist.gov/nistpubs/ams/NIST.AMS.100-68.pdf

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