2 SECTIONAL VIEWS WHAT ARE THEY ? SEE SOME EXAMPLES HOW DO YOU DO IT ? EXERCISES
3 SECTIONAL VIEWS WHAT ARE THEY ? They are used on drawings to allow you to see the inside detail of an object more clearly than hidden detail can.Sectional views show the internal construction details which may not be as obvious from a normal drawing.
7 SECTIONAL VIEWS HOW DO YOU DO IT ? CUTTING PLANES. The cutting plane shows where the object is sliced through. It is shown as a dashed line with thick ends.AThe cutting plane has arrows to show the direction of viewing and letters to distinguish it from other cutting planes.
8 SECTIONAL VIEWSAThe cutting plane shows where the object is sliced. The direction of the viewing is indicated by the arrows.AThe part of the object BEHIND the arrows is removed and the sectional view is left.
9 SECTIONAL VIEWSTo show the surface that has been cut the section is cross hatched. This means that lines at 45º approximately 5mm apart are drawn on the cut surface.A
10 A web is used to strengthen or support various engineering components. SECTIONAL VIEWSWebs.Hatching rules.A web is used to strengthen or support various engineering components.
11 Webs are never hatched when they are sectioned length ways. SECTIONAL VIEWSAHatching rules.Webs are never hatched when they are sectioned length ways.
12 SECTIONAL VIEWS Hatching rules. Sectional A-A demonstrates that you DO NOT cross hatch a web that is sectioned along its length.
13 SECTIONAL VIEWS Hatching rules. BBSectional B-B demonstrates that you DO cross hatch a web that is sectioned across its length.
14 Hidden detail is never shown on a sectional view. SECTIONAL VIEWSNote no hidden detail is shown.Hatching rules.Hidden detail is never shown on a sectional view.You do not show sectional views through nuts, bolts, washers, screws and shafts.
15 SECTIOAL END ELEVATION ON X-X SECTIONAL VIEWSRedraw the elevation and plan of the toggle used at the end of a pull cord switch.Draw the sectional end elevation on X-X.Leave 50mm in between views.Ø 5Ø 10Ø 29Ø 39PLANX2090XSECTIOAL END ELEVATION ON X-XELEVATION
16 SECTIONAL VIEWS Redraw the elevation and plan of a CD spindle. Draw the sectional end elevation on X-X.Leave 50mm in between views.R40R30R10XX654510XX
17 SECTIONAL VIEWS Hatching rules. Sectioned areas that are adjacent to each other should be cross hatched in different directions, still at 45 º.
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