sectional views

WHAT ARE THEY ?

SEE SOME EXAMPLES

HOW DO YOU DO IT ?

EXERCISES

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.

SOME EXAMPLES OF 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.

A A

The cutting plane has arrows to show the direction of viewing and letters to distinguish it from other cutting planes.

The cutting plane shows where the object is sliced. The

direction of the viewing is indicated by the arrows.

The part of the object BEHIND the arrows is removed and the

sectional view is left. A

A

A

A

To 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

A

Hatching rules.

A web is used to strengthen or support various engineering

components.

Webs.

Hatching rules.

Webs are never hatched when they are sectioned length

ways.

A

A

Hatching rules.

A A

Sectional A-A demonstrates that you DO NOT cross hatch a web that is sectioned

along its length.

Hatching rules.

Sectional B-B demonstrates that you DO cross hatch a web that is sectioned across

its length.

B B

Hatching rules.

Hidden detail is never shown on a sectional view.

Note no hidden detail is shown.

You do not show sectional views through nuts, bolts,

washers, screws and shafts.

Ø 5

X

X

ELEVATION

PLAN

SECTIOAL END ELEVATION ON X-X

Ø 10Ø 29

Ø 39

•Redraw 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.

90

20

R50 •Redraw the elevation and plan of a CD spindle.

•Draw the sectional end elevation on X-X.

•Leave 50mm in between views.

X

X

45

65

10

R40

R30

R10X

X

Hatching rules.

Sectioned areas that are adjacent to each other should be cross hatched in different

directions, still at 45 º.

A

A