Powered Hand Tools — Nail Guns and Saws
Nail guns and circular saws are the two most cited tools in carpentry injury data. The SWMS must address each on the basis of the specific tool, the operating mode, and the worker's competency.
Nail guns — the principal control is the trigger mode. Sequential-trigger (or full-sequential) mode requires the user to depress the safety tip first, then pull the trigger, for each nail. Contact-trip (or bump-fire) mode allows continuous firing as long as the trigger is held — drastically faster but with much higher injury rates because an inadvertent contact discharges the tool. The Australian Code of Practice and NIOSH guidance both recommend sequential-trigger as the default and reserve contact-trip for sheathing and decking where a flat continuous surface is being nailed and the worker's hands are demonstrably clear of the discharge zone.
The SWMS should specify: the tool model and operating mode, manufacturer training completion (the worker has read the operator's manual and demonstrated competency to a supervisor), eye and ear protection, no-hand-within-300mm rule from the firing tip, and a stop-work obligation if the tool double-fires, jams, or fires without trigger pull. Pneumatic nail guns must be disconnected from the air supply during transport and during clearance of jams. Gas-actuated nail guns must have the fuel cell removed during transport and storage.
Circular saws — the principal hazards are kickback (rotational reaction when the blade binds in the workpiece) and direct blade contact during plunge cuts. The controls are: sharp blades (a dull blade increases kickback risk), riving knives (mandatory on all saws sold in Australia post-2010), proper hold (one hand on the trigger, one on the front handle, body offset from the blade plane), workpiece support (clamping, sawhorses) so that neither hand is positioned to fall onto the blade if the saw kicks, and saw-set placement (avoid setting the saw down with the blade still spinning).
Track saws are increasingly preferred over freehand circular saws for sheet-material work because the track guide prevents kickback and provides built-in dust extraction. SawStop and equivalent flesh-detection bench saws are now mandated by some principal contractors as the table-saw default.
Mitre saws — kickback during cuts on twisted or warped material, blade contact during the return stroke, and projectile ejection of off-cuts. Mitre saw stands with material-support extensions (greater than 1m past the blade on each side) are required for any cuts on long timbers.
The SWMS for any powered hand-tool task must specify on-tool dust extraction (HEPA shop vacuum coupled to the tool), eye protection, hearing protection, and the manufacturer-recommended PPE for the specific tool. Generic 'use power tools safely' SWMS without the specific tool, mode, and dust-extraction details do not meet regulator expectations.