Engineering Tools, Equipment and Machinery
This domain tests safe and correct selection and use of hand tools, power tools and machines. Know the purpose of common hand tools (vernier calipers, micrometers, hacksaws, files, taps and dies, centre punches, scribers) and machines (drill press, pedestal grinder, lathe, milling machine, band saw, welders). Understand cutting tool geometry basics: file teeth cut on the forward stroke; hacksaw blades are selected by teeth per inch for material thickness; drill bits cut when rotated clockwise with correct speed and feed; taps require the correct tapping drill size.
Safety knowledge is central: secure work in a vice or clamp, never wear loose clothing or gloves near rotating machinery, tie back hair, remove chuck keys before starting, use the correct speed for the material, and never leave a machine running unattended. Understand the difference between drilling, boring, reaming and tapping, and between roughing and finishing cuts.
Traps: assuming higher speed always means faster work (it overheats and dulls tools); using a file without a handle; confusing a pedestal grinder's tool rest gap (keep it close to the wheel); and forgetting that a drill press table must be clamped and the chuck key removed.
Rule of thumb: choose the coarsest tool that still gives the required finish, and always match tool, material and speed. Worked example: cutting 3 mm mild steel sheet with a hacksaw needs a fine-tooth blade (24-32 TPI) because at least two teeth should be in contact with the material at all times; a coarse blade snags and breaks teeth.