CNC Course

Lesson 1 • Safety Standards and Shop Practices

Covers PPE requirements, lockout/tagout procedures, and hazard identification. Safe habits established here apply throughout every subsequent chapter.

Lesson 2 • CNC Coordinate Systems

Introduces Cartesian coordinates, absolute vs. incremental positioning, and machine vs. work offsets. Coordinate mastery is prerequisite for all programming tasks.

Lesson 3 • CNC Machine Types and Applications

Identifies mills, lathes, routers, plasma cutters, and EDM machines. Connects machine type to appropriate manufacturing application.

Lesson 4 • History and Evolution of CNC

Traces machining from manual to numerical control to modern CNC. Provides context for why CNC dominates precision manufacturing today.

Lesson 1 • GD&T Symbols and Datums

Introduces flatness, straightness, circularity, cylindricity, and datum reference frames. GD&T symbols define functional requirements beyond simple dimensional tolerances.

Lesson 2 • Reading Orthographic Projections

Teaches first- and third-angle projection, views, and section cuts. Drawing literacy is essential before translating designs into machine instructions.

Lesson 3 • Dimensions, Tolerances, and Fits

Explains nominal dimensions, bilateral and unilateral tolerances, and clearance, interference, and transition fits. Tolerance knowledge drives tool and process selection.

Lesson 1 • Cutting Tool Geometry and Materials

Explains rake angle, relief angle, helix angle, and tool materials including HSS, carbide, and coatings. Geometry and material directly determine tool life and cut quality.

Lesson 2 • Tool Holders and Spindle Interfaces

Examines collet chucks, end mill holders, shrink-fit, and hydraulic holders. Proper holder selection minimizes runout and maximizes rigidity.

Lesson 3 • Tool Life and Wear Management

Identifies flank wear, crater wear, chipping, and built-up edge. Recognizing wear patterns enables timely tool changes and consistent part quality.

Lesson 4 • Workholding Devices and Fixturing

Introduces vises, chucks, fixtures, and vacuum tables. Secure, repeatable workholding is foundational to dimensional accuracy and operator safety.

Lesson 1 • Feed Rate Calculation

Calculates feed rate from chip load, number of flutes, and RPM. Proper feed rate balances material removal rate with tool deflection and surface quality.

Lesson 2 • Material-Specific Parameter Tables

Provides parameter ranges for aluminum, steel, stainless, titanium, and plastics. Material properties dictate starting parameters before in-process optimization.

Lesson 3 • In-Process Parameter Optimization

Teaches overrides, listening for chatter, and iterative adjustment during cutting. Real-time optimization skills reduce scrap and improve throughput.

Lesson 4 • Depth and Width of Cut

Defines axial depth of cut, radial depth of cut, and their effect on cutting forces. Balancing DOC and WOC optimizes cycle time and machine rigidity.

Lesson 1 • Program Structure and Syntax

Explains program number, block format, word address, and end-of-program codes. Correct syntax is mandatory for controller acceptance and safe execution.

Lesson 2 • Subprograms and Parametric Coding

Introduces M98/M99 subprogram calls and variable-based parametric programming. Reusable code structures reduce errors and programming time for repeated features.

Lesson 3 • Tool and Work Offset Codes

Uses G43/G44 tool length compensation, G41/G42 cutter radius compensation, and G54–G59 work offsets. Offsets enable flexible, repeatable setups without reprogram.

Lesson 4 • Motion G-Codes

Covers G00 rapid, G01 linear feed, G02/G03 circular interpolation, and G28 home. Motion codes define every tool path executed by the machine.

Lesson 1 • Toolpath Simulation and Verification

Uses backplot, solid verify, and gouge detection to validate toolpaths before cutting. Simulation eliminates costly crashes and scrapped parts on the machine.

Lesson 2 • 2D and 2.5D Toolpath Strategies

Programs contour, pocket, facing, drilling, and slot operations in CAM. These strategies cover the majority of prismatic part features encountered in production.

Lesson 3 • CAM Workflow and Model Import

Covers CAD-to-CAM data flow, file formats, and model preparation for machining. A clean model import prevents downstream toolpath errors and wasted setup time.

Lesson 4 • Post-Processing and NC Output

Configures post-processors to output machine-specific G-code from generic toolpaths. Correct post-processing ensures code runs safely on the target controller.

Lesson 1 • Workpiece Mounting and Alignment

Covers vise tramming, part indicating, and datum surface preparation. Precise alignment ensures the machined coordinate system matches the programmed one.

Lesson 2 • Work Offset Setting and Probing

Sets G54 work offset using edge finder, probe, or tool touch-off. Correct work offset ties the program coordinate origin to the physical part.

Lesson 3 • Tool Loading and Length Measurement

Loads tools into holders, measures length with tool setter or gauge, and enters offsets. Accurate tool length data prevents crashes and dimensional errors.

Lesson 4 • Pre-Setup Planning and Documentation

Reviews setup sheets, tool lists, and operation sequences before touching the machine. Thorough planning reduces setup time and prevents costly mistakes.

Lesson 1 • CMM and Optical Measurement

Introduces coordinate measuring machines, vision systems, and laser scanners. These tools verify complex geometry and GD&T callouts beyond manual gauge capability.

Lesson 2 • Precision Measurement Instruments

Covers micrometers, calipers, bore gauges, and height gauges with calibration procedures. Instrument selection and proper technique determine measurement accuracy.

Lesson 3 • Surface Finish Measurement

Uses contact profilometers and non-contact methods to measure Ra and Rz values. Surface finish verification confirms toolpath and parameter choices met drawing requirements.

Lesson 4 • Statistical Process Control Basics

Applies control charts, Cp, and Cpk to monitor machining process stability. SPC data drives proactive adjustments before parts go out of tolerance.