Uses tools and equipment
The tools domain tests selection, safe set-up, calibration and maintenance rather than brand knowledge. Questions typically describe a task or a failure - a saw burning its way through stock, a laser out of true, a cord tripping the breaker - and ask for the cause or the correct practice.
Cutting tools
Circular saw blades are matched to the work: about 24 teeth for ripping, 40–60 for general crosscutting and framing, 80 or more for trim and melamine. Set blade depth so a tooth clears the stock by roughly 6 mm; a blade buried in the cut overheats and kicks back. The upper guard must return freely and is never pinned back. Mitre saws are set for bevel and mitre before the saw is started, and the material is held against the fence. Table saws run with a riving knife or splitter, anti-kickback pawls and a push stick.
Power supply and fastening
Site circuits are protected by GFCI. Cords are sized to the load and the run: a long, thin extension cord drops voltage, so the tool motor draws more current and overheats - a 15 A saw on a 30 m run needs a heavier gauge, not a longer cord. Powder-actuated tools are used only by certified operators, with eye and ear protection, a spall guard, and never into a material that can be punched through.
Checking accuracy
A spirit level is checked by turning it end for end on a surface that is either level or not; the bubble must read the same. A framing square is checked with the flip test: scribe a line along the blade, flip the square over, and scribe again - any gap means the square is out. Lasers are checked against a known elevation and recalibrated after a drop.
Worked example
A saw bogs down and the cord end is hot. Reasoning: the blade is sharp and the depth is set correctly, so the fault is supply. The 15 A saw is on a 30 m, 16-gauge cord; voltage drop at that load and length is significant, current rises and the motor and plug heat up. Moving to a 12-gauge cord of half the length, or a closer outlet, restores voltage - replacing the blade would not have helped.
Traps
Removing a guard for one cut; forcing a dull blade instead of sharpening or changing it; assuming a GFCI works without pressing its test button; and using a rip blade for finish trim, which tears the surface.