Which bench tools and hand processes shape metal at the bench, and how is each used safely and accurately?
Bench tools and hand processes: holding work in a bench vice, cutting with a hacksaw, removing metal by filing (cross-filing and draw-filing), cutting with a cold chisel, and the correct hammers (ball pein, cross-pein and claw).
The core hand-tool skills in SQA National 5 Practical Metalworking bench work: holding work in a bench vice, cutting with a hacksaw, removing metal by cross-filing and draw-filing, using a cold chisel, and choosing the right hammer (ball pein, cross-pein, claw).
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What this dot point is asking
Bench work means shaping metal by hand at the bench. The SQA expects you to name the main bench tools (vice, hacksaw, files, cold chisel and the correct hammers), say what each does, and describe how to use them accurately and safely. The skill is tested in the practical activity and sampled by the case study, so you must be able to explain technique, not just list tools.
Holding the work: the bench vice
A workpiece that sticks up high in the vice flexes and chatters, making the saw jump and the file skid, so the cut comes out rough or off line. Rigid holding is the foundation of accurate bench work.
Cutting to size: the hacksaw
The hacksaw cuts bar, rod and section to length.
- Fit the blade with the teeth pointing forward, because the saw cuts on the push stroke.
- Apply pressure on the push and ease off on the return so the teeth are not blunted.
- Use long, steady strokes that use the full length of the blade, keeping the cut just on the waste side of the scribed line.
- Choose a blade with enough teeth that at least three teeth are in contact with the metal, so the teeth do not snag on thin section.
Removing metal: filing
Filing brings the metal down to the line and finishes the surface.
- Cross-filing removes metal quickly: the flat file is pushed across the work in long, even strokes, cutting only on the forward stroke. Use it to take the work down to a scribed line.
- Draw-filing gives a smooth finish: the file is held at each end and pushed sideways along the work to leave fine, even marks.
- Keep the file clean with a file card; chips trapped in the teeth (called pinning) scratch the surface.
- Check flatness and squareness with an engineer's try square as you go.
Cold chisel and the correct hammers
A cold chisel is a hardened steel tool used to cut or shear metal cold (for example chopping off a rivet head or cutting a sheet). It is struck with a hammer while the work is held in the vice.
Try this
Q1. State why soft jaws are fitted to a bench vice. [1 mark]
- Cue. To protect a finished or soft workpiece from being marked by the hard serrated jaws.
Q2. Name the filing process used to give a smooth finish to a filed edge. [1 mark]
- Cue. Draw-filing.
Q3. Name the hammer best suited to closing over a rivet and say why. [2 marks]
- Cue. A ball pein hammer; its rounded pein spreads and shapes the rivet head.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA-style Describe4 marksA length of mild steel bar must be cut to size and one end filed flat and square. Describe the bench tools and hand processes you would use.Show worked answer →
Award up to 4 marks, 1 per correct stage and tool. Hold the bar firmly in a bench vice, low in the jaws and close to the cut line so it does not vibrate, using soft jaws if the surface must be protected (1). Cut to length with a hacksaw, with the blade teeth pointing forward so it cuts on the push stroke, applying pressure on the push and easing off on the return (1). File the end flat using cross-filing, pushing a flat file across the work in long, even strokes to take the metal down to the line (1). Check the end is square with an engineer's try square and finish with draw-filing for a smooth surface (1). A strong answer names the vice, hacksaw and file and links each to its job.
SQA-style Explain3 marksExplain why a hacksaw blade is fitted with the teeth pointing forward, and why work should be held low in the vice when sawing.Show worked answer →
Award up to 2 marks for the blade and 1 for the vice, to a maximum of 3. A hacksaw cuts on the push (forward) stroke, so the teeth must point forward so they bite and remove metal as you push, while the lighter return stroke clears the cut (1); fitting the blade backwards means it skids and does not cut (1). Holding the work low in the vice jaws, close to the cut, keeps it rigid so it does not vibrate or chatter; a workpiece sticking up high flexes, making the blade jump and the cut rough or off line (1).
Related dot points
- Measuring and marking out: using a steel rule, engineer's try square, scriber, odd-leg (jenny) callipers, dividers and a centre punch from a datum edge to transfer a drawing onto metal accurately.
How SQA National 5 Practical Metalworking expects you to measure and mark out a metal workpiece: working from a datum edge with a steel rule, engineer's try square, scriber, odd-leg callipers, dividers and a centre punch so that holes and lines are accurate before cutting.
- Drilling holes with a twist drill and countersinking, and cutting screw threads by hand: an internal thread with a tap and tap wrench, and an external thread with a die and die stock.
How SQA National 5 Practical Metalworking covers making holes and threads: drilling with a twist drill, countersinking, cutting an internal thread with a tap and tap wrench, and cutting an external thread with a die and die stock, all done accurately and safely.
- Finishing processes: removing sharp edges and burrs (deburring), cleaning and preparing the surface (emery cloth/abrasives), and applying a finish such as paint, lacquer or plating to protect the metal and improve its appearance.
How SQA National 5 Practical Metalworking covers finishing a metal product: removing sharp edges and burrs (deburring), cleaning and preparing the surface with abrasives, and applying a finish such as paint, lacquer or plating to protect the metal and improve its appearance.
- Metals and their properties: ferrous metals (mild steel) and non-ferrous metals (aluminium, copper, brass), and the properties that decide their use - strength, hardness, toughness, malleability, ductility, conductivity and corrosion resistance.
How SQA National 5 Practical Metalworking groups metals into ferrous (mild steel) and non-ferrous (aluminium, copper, brass) and the properties - strength, hardness, malleability, ductility, conductivity and corrosion resistance - that decide which metal suits a workshop job.
- Health and safety in the workshop: identifying hazards, using personal protective equipment (safety glasses, apron, gloves where appropriate), guarding machines, keeping a tidy area, and following safe working practices for hot, sharp and rotating processes.
How SQA National 5 Practical Metalworking expects you to work safely: spotting hazards, using personal protective equipment such as safety glasses and aprons, guarding machines, keeping a tidy workspace, and following safe practices for hot, sharp and rotating processes.