2.2 Dimensioning

• Meaning of dimensioning as used in drawing
• Types of dimensioning: linear, radial, angular and arc
• Lines used for dimensioning in drawing
• Forms of dimensioning: parallel, chain and combined
• Dimensioning given shapes in drawings

• identify the types of dimensioning in drawing
• draw lines used for dimensioning in drawing
• dimension given shapes in drawings
• embrace the importance of dimensioning in drawing

“Why is dimensioning applied in drawings?”

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1. Meaning of dimensioning
   40 min · 1 practice tasks · quiz
   What dimensioning is, why sizes must sit on a drawing, and how that answers why dimensioning is applied in Kenyan workshops and classrooms.
2. Linear dimensioning
   40 min · 1 practice tasks · quiz
   Linear dimensions as straight-line distances on length, width and height, placed outside the outline with extension lines and millimetre figures.
3. Radial dimensioning
   40 min · 1 practice tasks · quiz
   Sizing circles and arcs from the centre with R for radius or Ø for diameter, without giving both for the same circle.
4. Angular dimensioning
   40 min · 1 practice tasks · quiz
   Showing the size of an angle in degrees with a dimension arc between two sides, for slopes, chamfers and wedges.
5. Arc dimensioning
   40 min · 1 practice tasks · quiz
   The fourth type: arc length along a curve, distinct from radius, diameter and the straight chord between the ends.
6. Lines used for dimensioning
   40 min · 1 practice tasks · quiz
   Drawing the thin extension line, dimension line, arrowheads, figure and leader, and keeping them distinct from thick object outlines.
7. Parallel dimensioning
   40 min · 1 practice tasks · quiz
   The parallel or datum form: every size measured from one reference edge so errors do not pile along a chain.
8. Chain dimensioning
   40 min · 1 practice tasks · quiz
   Chain form: sizes placed end to end so overall is the sum, useful for equal bays, with the risk that small errors accumulate.
9. Combined dimensioning
   40 min · 1 practice tasks · quiz
   Combined form: chain the parts and add a parallel overall (or datum) so the maker can check that the sum is true.
10. Dimensioning given shapes
    40 min · 1 practice tasks · quiz
    Matching linear, radial and other types to features of a given combined shape, using correct lines and a sensible form, without repeating sizes.
11. Portfolio and why dimensioning matters
    40 min · 1 practice tasks · quiz
    A second dimensioned drawing for the portfolio, a recap of types, lines and forms, and a clear answer to why dimensioning is applied in daily making.