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ScotlandPractical WoodworkingSyllabus dot point

How is timber marked out and measured accurately before it is cut and shaped?

Marking out and measuring: working from a face side and face edge, using rules, squares, gauges, marking knives and templates to set out parts accurately, and the importance of accuracy to a well-fitting joint.

A focused answer to the SQA National 5 Practical Woodworking content on marking out and measuring, covering the face side and face edge, rules, squares, gauges, marking knives and templates, and why accurate marking out gives a well-fitting joint.

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  1. What this dot point is asking
  2. Start from a face side and face edge
  3. Tools for marking out
  4. Marking the waste and working accurately
  5. Try this

What this dot point is asking

The SQA wants you to know how timber is marked out and measured accurately before cutting: working from a face side and face edge, using the right tools, and why accuracy matters for a well-fitting joint. You should be able to describe the steps and tools.

Start from a face side and face edge

Measuring everything from the same two surfaces keeps errors from building up. If each line is measured from a different edge, the parts will not line up and the joint will be out of square.

Tools for marking out

  • Steel rule and tape measure - measure lengths in millimetres.
  • Try square - mark and check 90 degree lines across the face; sliding bevel for angles.
  • Marking gauge - scribe a line parallel to the face edge at a set distance; a mortise gauge has two pins to mark both sides of a mortise or tenon at once.
  • Marking knife - score a fine, accurate line across the grain that also cuts the surface fibres for a clean saw cut.
  • Templates and patterns - draw round to repeat the same shape or hole positions accurately.

Marking the waste and working accurately

A sharp pencil or knife gives a thin, accurate line; a blunt or thick mark adds error. For joints, the marking knife is preferred to a pencil because it is more precise.

Try this

Q1. State what the face side and face edge are used for. [1 mark]

  • Cue. As the reference (datum) surfaces from which all measuring and gauging is taken, so parts are accurate and square.

Q2. Name the tool used to mark two parallel lines for a tenon at once. [1 mark]

  • Cue. A mortise gauge (two pins set to the chisel width).

Q3. Explain why you cut on the waste side of a marked line. [2 marks]

  • Cue. Leaving the line means the part is slightly oversize and can be pared or planed exactly to the line, giving an accurate, tight fit; cutting on the line removes too much.

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 Explain3 marksExplain why a face side and face edge are marked on a piece of timber before marking out a joint.
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Award up to 3 marks for explained reasons. The face side and face edge are the two surfaces planed first to be flat, straight and square to each other (1). All measurements and gauge lines are then taken from these two reference surfaces, so every part is measured from the same datum and the parts will match (1). This keeps marking out accurate and square, so the joints fit together correctly; without a common reference, errors build up and the joint will be loose or out of square (1). Markers reward the idea of a true reference surface and measuring everything from it for accuracy.

SQA-style Name and use4 marksName a suitable marking-out tool for each task: measuring a length, marking a line square to the edge, gauging a line parallel to the edge, and marking a fine cutting line across the grain.
Show worked answer →

Award 1 mark each, up to 4. Measuring a length: a steel rule or tape measure (1). Marking a line square to the edge: a try square (its stock against the face edge, blade across the face) (1). Gauging a line parallel to the edge: a marking gauge (or mortise gauge for two lines) (1). Marking a fine cutting line across the grain: a marking knife, which scores a precise line and severs the surface fibres for a clean saw cut (1). Markers reward the correct tool for each task; using a pencil where a knife is asked for is less accurate.

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