Workshop Safety

Most workshop injuries come from a few causes: eyes struck by flying chips, hands in moving machinery, noise and dust that damage slowly, fire, electric shock and lifting. None of them needs luck to avoid; each is controlled by a habit, a guard or a piece of equipment that costs far less than the injury. This guide takes the subject in ten pages: how to assess and control risk, personal protective equipment, noise, dust and fumes, fire and explosion, electrical safety, machine and hand-tool safety, chemicals, gases and welding, the special hazards of lasers, 3D printers, CNC and soldering, and first aid and emergencies. Every worked number (exposure times, air changes, shock current, safety distances) is computed so that you can check your own shop. This is general information, not a legal standard: follow your equipment makers’ instructions and the rules where you work, and ask a qualified person about anything you cannot judge.

Start here: what is the hazard?

I am worried about…	Go to
where to start, ranking hazards, or writing a risk assessment	Risk Assessment and Hazard Control
safety glasses, gloves, a respirator, boots or clothing	Personal Protective Equipment
loud tools, ear defenders or hearing damage	Noise and Hearing Protection
sawdust, welding fume, smoke or poor ventilation	Dust, Fumes and Ventilation
fire, flammable liquids, oily rags, dust explosions or batteries	Fire, Fuels and Explosion
shock, earthing, RCDs, cords or working on live equipment	Electrical Safety
guards, kickback, stopping a machine, lifting or hand tools	Machine and Hand Tool Safety
solvents, adhesives, gas cylinders or welding	Chemicals, Gases and Welding
lasers, 3D printers, CNC machines, soldering or batteries	Lasers, 3D Printers, CNC and Soldering
first aid, an emergency plan, fatigue or building safe habits	First Aid, Emergencies and Safe Habits

A suggested order

Read Risk Assessment and Hazard Control first: it gives the method used on every other page. Then Personal Protective Equipment, Noise and Hearing Protection and Dust, Fumes and Ventilation cover what protects you every day; Fire, Fuels and Explosion and Electrical Safety cover the two hazards that can destroy a shop; Machine and Hand Tool Safety and Chemicals, Gases and Welding cover the tools and materials; Lasers, 3D Printers, CNC and Soldering and First Aid, Emergencies and Safe Habits finish with the newer machines and what to do when something goes wrong.

1. Risk Assessment and Hazard Control: Hazards and risks, the risk matrix, the hierarchy of controls, a job safety analysis and a worked assessment of a grinding job.
2. Personal Protective Equipment: Eye and face protection, gloves, respirators and filters, footwear and clothing: how to choose, fit and maintain each item.
3. Noise and Hearing Protection: Decibels and how they add, exposure time limits, noise reduction ratings and how much protection you really get.
4. Dust, Fumes and Ventilation: Exposure limits, how fast air must change, capture at the source, wood and metal dust, welding fume and filters.
5. Fire, Fuels and Explosion: The fire triangle, extinguisher classes, flammable storage, oily rags, combustible dust, hot work and lithium batteries.
6. Electrical Safety: Shock current and body resistance, RCDs and GFCIs, earthing, cords and plugs, lockout and what to do after a shock.
7. Machine and Hand Tool Safety: Guarding, stopping time and safety distance, kickback, lockout and tagout, lifting and ergonomics, and safe hand-tool habits.
8. Chemicals, Gases and Welding: Safety data sheets, solvents and adhesives, compressed gas cylinders, oxygen and carbon dioxide hazards, welding and cutting.
9. Lasers, 3D Printers, CNC and Soldering: The particular hazards of lasers, 3D printers and resin, CNC machines, soldering and batteries, with links to the full guides.
10. First Aid, Emergencies and Safe Habits: First-aid kit and actions, burns, bleeding and eye injuries, an emergency plan, incident logs, fatigue and safe habits.

Ten rules that prevent most injuries

1. Eyes, ears and lungs. Wear safety glasses for every cutting, drilling, grinding or striking task, hearing protection when you must raise your voice, and a mask for dust.
2. Hold the work. A clamp or vise keeps your hands out of the cut (see Workholding).
3. Keep every guard in place and know where the stop is before you start.
4. No loose clothing, jewelry or long hair near rotating parts, and no gloves at drills, lathes and mills.
5. Unplug or lock out before changing a blade, bit or belt, or clearing a jam.
6. Never leave heat, a laser or a running machine unattended.
7. Keep an extinguisher, a first-aid kit and a clear exit where you can reach them.
8. Use RCD (GFCI) protection on every shop socket.
9. Know what you are cutting or heating (read the safety data sheet) and ventilate.
10. Do not work tired, rushed or impaired, and tell someone when you are working alone with risk.

Control the hazard, not just the person

Protective equipment is the last line of defense, because it depends on being worn and fitting well. A guard, an extraction hood or a safer material works without anyone remembering anything. The first page, Risk Assessment and Hazard Control, shows how to apply the hierarchy to a real job.

Quick reference: numbers and rules

Topic	Number or rule	Page
Risk score	likelihood × severity (1 to 5 each); 10 to 16 is high, 17 and above is extreme	Risk Assessment and Hazard Control
Noise	two equal sources add 3 dB; limit time halves every 3 dB above 85 dB	Noise and Hearing Protection
Ear defender rating	real protection ≈ (NRR − 7) ÷ 2 in dB, less for a poor fit	Noise and Hearing Protection
Ventilation	C = G ÷ Q at steady state; capture at the source first	Dust, Fumes and Ventilation
Fire	remove heat, fuel or oxygen; match the extinguisher class	Fire, Fuels and Explosion
Shock	I = V ÷ R; 30 mA RCD; let-go about 10 mA	Electrical Safety
Safety distance	D = K T + C: the longer a machine takes to stop, the further back the guard	Machine and Hand Tool Safety
Gas cylinders	secured upright; oxygen above 23.5 % is a fire hazard	Chemicals, Gases and Welding
Lasers	goggle density OD = log₁₀(E ÷ MPE)	Lasers, 3D Printers, CNC and Soldering
Emergency	call for help, stop the hazard, treat the casualty; flush eyes for 15 minutes	First Aid, Emergencies and Safe Habits

Related guides

• Shop Tools: layout, power, lighting, measuring, workholding and tool care.
• Laser Safety, Fire and Fumes (in the Laser Cutting guide): classes, goggles and the enclosure.
• 3D Printing and Additive Manufacturing: printer, resin and powder hazards.
• CNC Machining: guarding, enclosures and workholding on machine tools.
• Electronics Fundamentals: working on circuits and batteries safely.
• System Integration and Industrial Robotics: machine safety systems, safety distances and risk graphs.

FAQ

What is the single most important thing I can do?

Hold the work and keep your hands out of the cut, and wear eye protection every time. Most serious workshop injuries are hands in machinery and eyes struck by debris.

Do I need an RCD or GFCI in my garage workshop?

Yes. It is the most effective protection against fatal shock, and costs little. See Electrical Safety.

Which extinguisher should I buy?

A multi-purpose ABC dry-powder or a CO₂ extinguisher near the exit, plus a fire blanket; know how to use it and check it each year. See Fire, Fuels and Explosion.

When do I need hearing protection?

Whenever you have to raise your voice to be heard at arm’s length, which is about 85 dB or more. See Noise and Hearing Protection.

Where did the old Workshop Safety sections go?

All of them are in this guide with much more depth: personal protective equipment, noise, dust, fire, electrical, machines, chemicals, special hazards and first aid each have their own page.

References

• OSHA, Occupational Safety and Health Standards (29 CFR 1910, general industry) and HSE (UK), Health and Safety at Work guidance.
• ISO 12100, Safety of machinery: general principles for design, risk assessment and risk reduction; ISO 13855 (positioning of protective equipment).
• ANSI Z87.1 (eye and face protection), ANSI/ISEA 105 (hand protection), NIOSH Criteria for a Recommended Standard: Occupational Noise Exposure.
• NFPA 10 (portable fire extinguishers), NFPA 70 (National Electrical Code), IEC 60479-1 (effects of current on human beings).

Last reviewed: October 2026. This is general information, not legal or professional advice: laws and exposure limits differ by country and workplace, so follow your equipment makers’ instructions and the rules that apply to you.