Machine Guarding — Protecting Workers from Dangerous Moving Parts (2026)

Why Machine Guarding Matters

Moving parts of machinery cause some of the most serious injuries seen in the trades. A hand drawn into an unguarded blade, a sleeve caught on a rotating spindle, or a finger trapped in the nip point of a roller can result in permanent disability in a fraction of a second. The risks fall into a few clear categories: amputation (saw blades, cutters, guillotines), crushing (presses, closing tools), entanglement (rotating shafts, spindles, drill bits) and cutting or severing (blades, abrasive wheels).

Woodworking machinery is consistently one of the highest-risk areas. The spindle moulder is widely regarded as the most dangerous machine in a joinery workshop, and the circular saw is responsible for a large share of amputation injuries. Metalworking machines — grinders, guillotines, power presses and lathes — carry the same severity of risk. Because these injuries happen so fast and the outcomes are so severe, guarding is not optional housekeeping; it is the primary control standing between the operator and harm.

The Legal Basis: PUWER 1998

The key legislation is the Provision and Use of Work Equipment Regulations 1998 (PUWER). PUWER places duties on anyone who provides or uses work equipment. In summary, work equipment must be:

• Suitable for the work and the conditions it is used in
• Maintained in a safe condition and, where appropriate, inspected
• Used only by people who have received adequate information, instruction and training
• Fitted with measures to prevent or control access to dangerous parts of machinery

Regulation 11 specifically requires measures to prevent contact with dangerous parts — and crucially, it sets out a hierarchy of protection. You must work down that hierarchy in order, using the most effective measure that is practicable, and only moving to a lower tier where a higher one is not reasonably achievable. PUWER sits alongside the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999, which require you to assess the risks before work begins.

The Hierarchy of Guarding Measures

PUWER Regulation 11 requires you to provide protection in a set order of preference. Start at the top and only move down when the measure above is not practicable for the task.

1. Fixed Enclosing Guards (Best)

A fixed enclosing guard physically prevents access to the dangerous part and has no moving parts of its own. It is held in place permanently — typically bolted or fastened so that a tool is required to remove it. Because there is nothing for the operator to defeat or forget, a fixed guard is the most reliable form of protection and sits at the top of the hierarchy. Wherever a dangerous part does not need to be accessed during normal operation, it should be fixed-guarded.

2. Other Guards and Protection Devices

Where a fixed guard is not practicable because the operator needs regular access — to feed material, clear waste or change a workpiece — you use other guards or protection devices:

• Interlocked guards: a movable guard wired so the machine cannot run while the guard is open, and the dangerous part has stopped before the guard can be opened. Opening it stops the machine.
• Adjustable or self-adjusting guards: guards that follow the workpiece, such as the riving knife and crown guard on a circular saw, or the bridge guard on a planer/surfacer. They enclose as much of the cutter as the job allows.
• Other protection devices: trip devices, pressure-sensitive mats, two-hand controls and light curtains that detect and stop the hazard.

3. Protection Appliances (Jigs, Holders, Push Sticks)

Where the operator must work close to the cutter, protection appliances keep hands out of the danger zone. Push sticks, push blocks, jigs, holders, false fences and featherboards all keep the workpiece under control while keeping the operator's hands at a safe distance. A push stick on a saw or spindle moulder is not an afterthought — it is a required control, and operators should be trained to use the correct appliance for each cut.

4. Information, Instruction, Training and Supervision

At the base of the hierarchy is the provision of information, instruction, training and supervision. This never replaces the physical measures above — guards and appliances come first — but it supports them. Operators need to understand the residual risks, how to use the machine safely, and how to use the guards and appliances correctly. High-risk machines require supervision until competence is proven.

Practical Rules for Operators

A guard only protects you if it is fitted, set correctly and used. The following rules apply on every machine, every time:

• Never remove or defeat a guard. Bypassing an interlock, propping a guard open or running with a guard removed is one of the most common causes of serious injury and a clear PUWER breach.
• Do not use a machine with a missing or damaged guard. Report it, take the machine out of use, and tag it so no one else runs it until it is repaired.
• Use push sticks and the right jig for the cut. Keep hands out of the line of the blade or cutter at all times.
• Make sure emergency stops and braking work. Spindle moulders and saws should brake quickly; test the emergency stop before relying on it.
• Isolate before cleaning or maintenance. Never clear waste, change a blade or reach into a machine while it can still start. Use proper safe isolation and lock-off (see our guide to LOTO and safe isolation) so the machine cannot be re-energised while your hands are inside it.
• Keep guards maintained and in position. A guard that is bent, loose or set wrong gives a false sense of safety.

Other Risks to Control

Guarding the moving parts is the priority, but machines create other hazards that must be controlled at the same time:

• Ejection of material or workpieces: kickback on a saw, or a workpiece thrown by a spindle moulder, can cause serious impact injury. Riving knives, anti-kickback fingers, correct feed direction and proper hold-downs all reduce the risk.
• Hot and sharp swarf: grinding and cutting metal throws off hot sparks and sharp swarf. Eye protection, screens and correct positioning are essential.
• Noise: many workshop machines exceed the action levels under the Control of Noise at Work Regulations 2005. Assess exposure and provide hearing protection.
• Dust and fume: wood dust is a recognised cause of asthma and nasal cancer, and metalworking generates harmful fume. Local exhaust ventilation (LEV) and extraction at source are required under COSHH, with regular thorough examination of the LEV system.

Training and Competence

PUWER requires that operators are trained and competent for the machine they use. This is especially important for high-risk woodworking machines such as the spindle moulder and circular saw, where recognised training (for example to the standards historically set out for woodworking machinery) is the benchmark. Use of these machines should be restricted to authorised people who have demonstrated competence — not whoever happens to be free.

Young and inexperienced workers need extra care. They are statistically more likely to be injured, and a specific risk assessment must take account of their lack of experience and awareness. Keep them away from the highest-risk machines until they are properly trained and supervised — see our guidance on protecting young workers for the additional duties involved.

Maintenance and Inspection

Guards and safety devices are only effective if they are maintained. Build them into your routine inspection and maintenance regime: check that fixed guards are secure, that interlocks stop the machine reliably, that adjustable guards move freely and that emergency stops and braking work. Worn, damaged or missing guards must be repaired before the machine is used again.

PUWER also requires inspection where the safety of work equipment depends on the installation conditions or where deterioration could cause a danger. For machinery, this means a competent person should inspect at suitable intervals and record the findings. Keep records of guard checks, interlock tests and any defects found so you can demonstrate a managed system if an inspector asks.

Quick Reference: The Guarding Hierarchy