MEC 135 - Introduction to Computer Numerical Control Machining

Credits: 3
3 Skills Lab Hours

Description
This course provides students with an introduction to computer numerical control (CNC) machining and its role in modern manufacturing. Students gain hands-on experience with CNC mill and lathe operations, focusing on safety, setup, tool selection and basic G-code programming. Emphasis is placed on precision measurement, process planning and producing machined parts that meet design specifications. By the end of the course, students are able to set up, program and operate CNC machines to manufacture simple components.

Learning Outcomes
Upon successful completion of the course, the student will:

Describe the role of CNC machining in manufacturing and prototyping.
Demonstrate proper safety procedures when operating CNC equipment.
Select appropriate cutting tools and materials for machining operations.
Interpret engineering drawings to apply geometric dimensioning and tolerancing (GD&T).
Set up CNC machines including workholding, tool offsets and zero points.
Develop effective G-code programs.
Operate CNC milling and turning machines to produce simple parts.
Apply precision measurement techniques to verify part accuracy.
Evaluate machined parts for surface finish, dimensional accuracy and tolerances.
Document machining processes and outcomes through setup sheets and inspection reports.

Listed Topics

Introduction to CNC machining and manufacturing applications
CNC machine types and components (mill, lathe, control systems)
Shop and machine safety protocols
Cutting tools, materials and tool holders
Workholding methods (vises, chucks, fixtures, clamps)
Engineering drawings and GD&T basics
Introduction to G-code and machine language
Coordinate systems, offsets and tool length compensation
CNC machine setup and operation
Milling and turning operations for simple geometries
Measurement and inspection tools (calipers, micrometers, gauges)
Surface finish and tolerance evaluation
Documentation: setup sheets, inspection reports and part programs

Reference Materials
Instructor-approved textbook and materials

Students who successfully complete this course acquire general knowledge, skills and abilities that align with CCAC’s definition of an educated person. Specifically, this course fulfills these General Education Goals:

Quantitative & Scientific Reasoning
Technological Competence

Approved By: Dr. Quintin B. Bullock Date Approved: 03/09/2026

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