Safety Protocol 001: Laser Cutter Operation Safety Procedures¶

Protocol ID: U3M3-SAFE-001 Context: Complete operational safety procedures for CO2 laser cutter startup, operation, and shutdown Hazard Level: High (Class 4 laser, fire risk, toxic fumes, high voltage) Target Audience: All students

Potential Hazards¶

Fire: All laser-processable materials are combustible. Unattended operation is the leading cause of laser lab fires. Flame can develop in under 5 seconds.
Toxic fumes: Every material produces fumes when laser-processed. Without exhaust, fumes accumulate to hazardous concentrations within minutes.
Laser beam exposure: If interlocks fail or are bypassed, the invisible 10.6μm beam causes immediate corneal and skin burns.
Laser tube damage: Operating without water cooling destroys the tube within seconds. Replacement cost: $200-800.
Electrical shock: Power supply operates at 15,000-25,000V DC — lethal. Never open electrical compartments.
Mechanical injury: Moving gantry can trap fingers; rapid acceleration creates pinch hazards.
Material shifting: Unsecured materials can move during cutting, causing misaligned cuts or fire from repeated passes on the same spot.

Required Precautions & Procedures¶

Startup — In This Order¶

Water chiller ON — verify temperature 18-22°C, flow confirmed
Exhaust system ON — verify airflow at intake
Air assist ON — verify air at nozzle
Laser power ON — wait for initialization
Never power the laser before the chiller is running and confirmed

Before Every Job¶

Identify material — confirm it is on the SAFE list
Set focus to the material surface using the calibrated gauge
Load file and verify settings match the material and thickness
Run FRAMING to confirm the job fits within the material
Verify no loose items, clamps, or debris will obstruct the gantry or beam

During Operation — MANDATORY¶

An operator MUST be present and attentive for the ENTIRE duration of every job
NEVER leave a running laser unattended — not even for 30 seconds
The lid must remain CLOSED while the laser is firing
Watch for sustained flame through the viewing window
Keep a spray bottle of water and fire extinguisher within arm's reach
Keep one hand near the EMERGENCY STOP button at all times
If you must leave: PAUSE the job first (do not leave even while paused if possible)

Fire Response Protocol¶

Brief flare (<3 seconds): Normal during cutting — continue monitoring
Sustained flame (>3 seconds):
Press EMERGENCY STOP immediately
Open lid (this stops the laser via interlock and provides access)
Spray water on the flame from the spray bottle
If the fire does not extinguish in 5 seconds: use CO2 fire extinguisher
If fire spreads beyond the cutting area: evacuate and call 911
After any fire event: inspect the machine for damage before resuming. Clean charred debris. Report the incident.

Shutdown — In This Order¶

Keep exhaust running 30-60 seconds after last cut
Remove parts after cooling
Clean debris from honeycomb bed
Power off the laser
Turn off air assist
Allow chiller to run 3-5 minutes after laser power-off
Turn off chiller
Turn off exhaust last
Close the lid

Emergency Stop Situations¶

Press EMERGENCY STOP immediately if: - Sustained flame or fire observed - Unusual sounds (grinding, crashing, electrical arcing) - Material shifts or dislodges during cutting - Smoke accumulation indicates exhaust failure - Lid interlock appears to have failed - Anything unexpected or concerning occurs

After EMERGENCY STOP: do NOT immediately restart. Investigate the cause, resolve the issue, then restart from the beginning of the startup sequence.

PPE Requirements¶

Equipment	When Required	Specification
Safety glasses	During all machine operation	ANSI Z87.1 minimum; CO2-rated if open-beam system
Heat-resistant gloves	When removing freshly cut materials	Standard work gloves
Hearing protection	If exhaust > 85 dB	Earplugs or earmuffs

Last Updated: 2026-03-19