Unit 03: CO2 Laser Cutting & Engraving¶

Unit Metadata¶

Microcredential ID: MCCPDL-U03-CO2Laser-v1.0
Title: CO2 Laser Cutting & Engraving for Prototyping
Version: 1.0
Credit Hours: 12 (3 hours per module)
Prerequisites: None; basic material knowledge helpful
Target Audience: Design students, makers, product developers, fabricators

Unit Description¶

This unit develops comprehensive competency in CO2 laser cutting and engraving systems. Students learn the physics of laser-material interaction, safe machine operation, material selection and preparation, job design optimization, and emergency procedures. The unit emphasizes Class 4 laser safety (eyes, skin, thermal hazards), precise power/speed optimization, and the distinction between cutting and engraving workflows. All students complete a safety certification before operating live equipment.

Standards Alignment¶

ANSI Z136.1-2023 - American National Standard for Safe Use of Lasers (laser safety standard)
OSHA 1910.97 - Non-Ionizing Radiation (laser safety in workplace)
ISO 11553-1:2005 - Safety of Machinery — Laser Processing Machines (machine safety requirements)
ANSI Z535.4-2011 - Safety Labels and Signs
UL 61010-2-7 - Safety of Laser Products (equipment standards)
NFPA 79 - Electrical Standard for Industrial Machinery (machine safety)

Learning Outcomes¶

Knowledge¶

Explain CO2 laser physics: beam generation, lasing medium, optics, power output
Identify laser wavelength (10.6 μm) and explain why certain materials absorb/reflect IR
Classify materials as approved, prohibited, or requires-testing for laser processing
Understand the difference between cut, engrave, and score operations
Interpret Epilog laser software settings (power, speed, frequency, resolution)
Recognize Class 4 laser hazards (eye exposure, skin burn, fire risk, electrical hazard)

Skills¶

Operate CO2 laser safely: align materials, set focus, configure power/speed, execute jobs
Prepare artwork files for laser (vector vs. raster, DPI, color/power mapping)
Calculate optimal power and speed for specific materials and thicknesses
Perform maintenance: mirror alignment, lens cleaning, exhaust system verification
Execute emergency shut-down and respond to thermal events (material ignition)
Select materials and prepare cuts (grain orientation, kerf compensation, nesting)

Competency¶

Design and execute a cutting project from concept through finished product (tolerances, kerf, assembly)
Optimize engraving settings for photo-quality results or functional surface marking
Apply fire prevention protocols and ensure exhaust systems function before every job
Troubleshoot failed cuts: char, delamination, incomplete cuts, warping
Maintain equipment logs and schedule preventive maintenance
Evaluate new materials for laser compatibility (through testing or SDS analysis)

Unit Structure¶

Module	Title	Duration	Focus
M1	Laser Technology Fundamentals	3 hours	CO2 laser physics, beam path, Class 4 hazards, wavelength interaction
M2	Material Science for Laser Processing	3 hours	Approved materials list, prohibited materials with reasoning, thickness limits, kerf
M3	Machine Operation & Job Setup	3 hours	Epilog software, power/speed settings, focus procedure, vector vs. raster, air assist
M4	Safety Systems & Emergency Procedures	3 hours	Exhaust verification, fire prevention, interlocks, emergency protocols, maintenance

Assessment Strategy¶

Formative¶

Module quizzes (10-15 questions each, focus on safety concepts)
Hands-on competency: focus alignment, material setup, power/speed calculation
Job design review: students submit design file for instructor verification before laser operation

Summative¶

Safety Certification: Written exam (focus on emergency procedures, material safety, Class 4 hazards)
Practical Project: Design and execute a cutting project with kerf compensation and tight tolerances
Maintenance Log: Document one complete maintenance cycle (mirror alignment, lens cleaning, exhaust check)

Portfolio Evidence¶

Photos of 3-4 completed projects showing varied materials (wood, acrylic, leather, etc.)
Design files demonstrating power/speed optimization
Maintenance checklist completion
Safety certification card

Instructional Resources¶

Primary Resources¶

CO2 Laser System: Epilog Zing, Helix, or equivalent (40-100W recommended for teaching)
Exhaust System: Dedicated fan and ductwork (exterior vented, not recirculated)
Optics & Alignment Tools: CO2 laser alignment target, mirror alignment jig, lens inspection kit
Software: Epilog CorelDRAW driver (or vendor-supplied software), design file templates
Material Library: Wood (hardwood, plywood, MDF), acrylic, leather, anodized aluminum, textiles
Test Kit: Scrap materials for power/speed testing before production jobs

Safety Equipment¶

Class 4 laser safety glasses (for specific 10.6 μm wavelength)
Fire extinguisher (Class A/B/C, sized for laser enclosure)
First aid kit with burn treatment
Emergency stop button (E-stop) accessible from front of machine
Interlocked enclosure door (prevents operation if door open)

Standards Documents¶

ANSI Z136.1-2023 (full laser safety standard)
Printer manufacturer documentation (Epilog, Universal Laser Systems, etc.)
Material SDS sheets for flammability/hazard assessment
OSHA guidelines on laser safety in workplace

Accessibility Considerations¶

Visual Accessibility¶

High-contrast slides with large text (18pt minimum for technical diagrams)
Detailed verbal descriptions of laser cutting process (for students with visual impairment)
Printed material safety reference (large font)
Screen reader compatible digital materials

Auditory Accessibility¶

Captions on all instructional videos
Loud laser operation (~85dB); hearing protection available
Visual indicators for alarms and warnings
Written emergency procedures (backup to verbal announcements)

Motor Accessibility¶

Pre-aligned laser stations for students unable to use alignment tools
Adaptive cutting bed features (lower height for wheelchair accessibility)
Video demonstration of focus/alignment as alternative to hands-on
Simplified job submission process (pre-made material holders)

Cognitive Accessibility¶

Clear, sequential procedures with visual step-by-step guides
Simplified material decision flowchart
Glossary of laser/optics terminology
Color-coded power/speed charts

Neurodiversity Accommodations¶

ADHD: Timed segments (15-20 min focus + break), movement activities, checklist-based procedures
Autism: Consistent terminology, predictable operation sequences, advance notice of loud noise
Dyslexia: Graphical guides, audio descriptions, simplified material reference
Sensory Processing: Pre-warning of noise levels, offer quiet observation, sensory-friendly schedule

Unit Learning Path¶

START → M1 Technology Fundamentals (laser physics, Class 4 hazards)
        ↓
        → M2 Material Science (approved/prohibited, WHY—laser wavelength interaction)
        ↓
        → M3 Machine Operation (hands-on: alignment, software, power/speed tuning)
        ↓
        → M4 Safety Systems (fire prevention, exhaust verification, emergency procedures)
        ↓
        → Safety Certification Exam (written + practical demonstration)
        ↓
        → Hands-on Supervised Practice (instructor-supervised first 3 projects)
        ↓
        → Portfolio Project (design, execute, optimize)
        ↓
        → Unit Assessment
        ↓
        END (Independent laser operator)

Success Criteria¶

Passing score (70%+) on safety certification exam
Successful execution of 2+ cutting projects with acceptable tolerance
Successful execution of 1+ engraving project with high-quality surface finish
Demonstration of proper focus alignment, power/speed verification, and exhaust check before every job
Completion of maintenance log (mirror alignment, lens cleaning, exhaust verification)
Ability to identify prohibited materials and explain WHY they're dangerous

Lab Setup & Safety Compliance¶

Dedicated Laser Room: Separate from other operations; controlled access
Exhaust Venting: Exterior-vented (not recirculated); intake airflow adequate for cooling
Interlocked Enclosure: Door must close before laser can operate
E-Stop Button: Accessible; tested monthly
Safety Signage: Class 4 laser hazard labels on enclosure and on operator position
Material Storage: Flammable materials (wood) stored away from laser area; acrylic and non-flammables separated
Operator Training: All students must pass safety certification before independent operation

Regulatory Compliance Notes¶

ANSI Z136.1 requires laser safety training for all operators and bystanders
OSHA 1910.97 mandates safety awareness and hazard control
Machine manufacturer must provide safety documentation and maintenance schedule
Eye protection must meet 10.6 μm CO2 laser wavelength specification (not visible-light laser glasses)
Exhaust system must meet local air quality regulations (check with facilities/environmental health)

Integration with Other Units¶

Unit 01 & 02 (FDM/SLA): Laser can process printed parts for finishing, assembly, or modification
Unit 04 (CNC): Both processes produce precision parts; laser for flat stock, CNC for 3D
Portfolio Path: Design → 3D print (FDM/SLA) → Laser cut/engrave for finishing → CNC for advanced features

Advanced Topics (Optional Extensions)¶

Raster engraving optimization (photo quality, speed vs. detail trade-offs)
Cut-resistant materials (anodized aluminum, coated stainless steel)
Multi-pass cutting (thick materials, ceramics)
Parametric design for kerf compensation
Integration with design software (Adobe Illustrator, Adobe InDesign, CorelDRAW plugins)

Next Steps¶

Enroll in Unit 04: CNC Routing & Subtractive Fabrication
Advanced elective: Multi-color engraving, industrial laser safety, laser maintenance
Certification path: Become a lab technician supervising laser operations for other students

Last Updated: 2026-03-18 Maintained By: MCC Prototype Design Lab Curriculum Development Safety Review Date: 2026-06-18 (quarterly)