3.2 Pictorial drawing

• Types of pictorial drawing: isometric and oblique
• Drawing 3D figures (prisms and pyramids) in isometric projection
• Constructing oblique projection drawings
• Dimensioning pictorial drawings

• identify types of pictorial drawings used in metal technology
• draw three-dimensional figures used in metal technology
• construct pictorial drawings in isometric projection
• construct pictorial drawings in oblique projection
• dimension pictorial drawings and appreciate their use

“Why are pictorial drawings useful in metal technology?”

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1. Why pictorial drawings are used
   40 min · 1 practice tasks · quiz
   What a pictorial drawing is, how it differs from the flat orthographic views, and why a workshop needs both.
2. Isometric and oblique: the two families
   40 min · 1 practice tasks · quiz
   The difference between the two kinds of pictorial drawing used in metalwork, and the trade-off each one makes.
3. The isometric axes
   40 min · 1 practice tasks · quiz
   The three axes every isometric drawing is built on, the 30 degree rule, and the fact that true lengths are measured only along the axes.
4. Isometric grid paper and freehand sketching
   40 min · 1 practice tasks · quiz
   Using triangular grid paper to sketch quickly and accurately at the bench, and why you must still practise on plain paper.
5. The crating method
   40 min · 1 practice tasks · quiz
   Building any isometric drawing by drawing the overall box first, marking the cuts on it, and then removing the waste.
6. Drawing a rectangular prism
   40 min · 1 practice tasks · quiz
   Setting out a plain rectangular bar in isometric, measuring each of the three dimensions along its own axis.
7. Drawing an angle bracket
   40 min · 1 practice tasks · quiz
   Applying crating to the L-shaped bracket: locating the cut by measuring in along the axes, then taking it down to depth.
8. Drawing a hexagonal prism
   40 min · 1 practice tasks · quiz
   Plotting a hexagon inside an isometric crate by offsets, because a regular hexagon does not stay regular in isometric.
9. Drawing a pyramid
   40 min · 1 practice tasks · quiz
   Constructing a square pyramid from its crate by finding the centre of the base with diagonals and raising the true vertical height.
10. Sloping faces and non-isometric lines
    40 min · 1 practice tasks · quiz
    Why a sloping edge can never be drawn by its angle or its length, and the plot-and-join method that replaces both.
11. Circles in isometric: the four-centre method
    40 min · 1 practice tasks · quiz
    Constructing the ellipse that a circle becomes in isometric, using four centres found from the crated square.
12. Drawing a cylinder
    40 min · 1 practice tasks · quiz
    Building a round bar from two ellipses joined by tangent lines, and deciding how much of the far end is seen.
13. Oblique projection
    40 min · 1 practice tasks · quiz
    Setting out an oblique drawing with a true-shape front face, and seeing why circles on that face stay circles.
14. Cavalier and cabinet oblique
    40 min · 1 practice tasks · quiz
    Why drawing the depth at full size makes an object look stretched, and why halving it looks natural.
15. An oblique drawing of a round part
    40 min · 1 practice tasks · quiz
    Drawing a flanged bush in cabinet oblique, and seeing directly how much work the true front face saves.
16. Choosing isometric or oblique
    40 min · 1 practice tasks · quiz
    Deciding which projection suits a given part, and recognising the cases where neither pictorial view is the right answer.
17. Dimensioning pictorial drawings
    40 min · 1 practice tasks · quiz
    The rules for putting sizes on a pictorial drawing so they can be read without ambiguity.
18. Common dimensioning errors
    40 min · 1 practice tasks · quiz
    The four faults that appear in most Grade 10 pictorial drawings, how to spot them, and a self-check to run before handing work in.
19. Reading a pictorial drawing
    40 min · 1 practice tasks · quiz
    Working out what a component is from its pictorial drawing: finding the overall block, naming what has been removed, and locating each size.
20. A pictorial drawing of a made item
    40 min · 1 practice tasks · quiz
    Producing a general pictorial view of a real workshop item, with its parts named and a joint shown in detail.