Half sections

Symmetrical parts may be drawn half in section and half in outside view. This type of drawing avoids the necessity of introducing dotted lines for the holes and the recess. Dimensioning to dotted lines is not a recommended practice. Fig. 8.8

Plan B
Revolved Section Spanner

Revolved sections

A special spanner is illustrated in Fig. 8.8. A revolved section is shown on the handle to indicate the shape of

the cross section at that point. This is a convenient convention to use on single view drawings because the shape could not be confirmed without projecting a second view or an added note.

A second type of revolved section in Fig. 8.9 shows a case where it is required to indicate details on two separate intersecting planes. The elevation in section has been drawn assuming that the right hand plane has been revolved to the horizontal position. Note that the thin web is not cross hatched.

Revolved Section View

Figure 8.10 shows a sectioned elevation from a plan where the section line is taken along three neighbouring planes which are not at right angles to one another. The section line follows the section planes in order, and is thickened at each change of direction.

Figure 8.10 shows a sectioned elevation from a plan where the section line is taken along three neighbouring planes which are not at right angles to one another. The section line follows the section planes in order, and is thickened at each change of direction.

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Responses

  • salvia brockhouse
    What is half section?
    2 years ago
  • merry gammidge
    How to draw half section?
    2 years ago

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