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Changes to assessment: Engineering, D&T, PDT Ignore section (b) and (c) week 4 ATI see new sheet. Week 2 Orthographic Projection & Sectional Views . First Angle Third Angle Sectional views. Plan View. End Elevation (Right). Front Elevation. End Elevation (Left). Plan View.

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changes to assessment engineering d t pdt ignore section b and c week 4 ati see new sheet
Changes to assessment:

Engineering, D&T, PDT Ignore section (b) and (c) week 4

ATI see new sheet

slide3

Week 2

Orthographic Projection & Sectional Views

slide4

First Angle

  • Third Angle
  • Sectional views
slide6

Plan View

End Elevation

(Right)

Front Elevation

End Elevation

(Left)

slide7

Plan View

End Elevation

(Left)

End Elevation

(Right)

First Angle

Front Elevation

slide8

Outlines

Construction

Hidden

Centre

Section

Linework

slide10

Plan View

End Elevation

(Left)

End Elevation

(Right)

Third Angle

Front Elevation

slide11

Note:

  • six views in total may be derived from any shape
  • only draw a maximum of three
slide12

Symbols

Derived from a truncated cone:

slide24

Background

  • Produced when one imagines the component to be cut through a defined cutting plane
slide25

Cutting plane and direction of viewing is defined on a non-sectional view using chain lines thickened at each end

The direction of viewing indicated as shown by arrows

slide26

Reasons for sectioning

  • to illustrate internal features
  • to reduce number of hidden detail lines
  • to allow internal features to be dimensioned
  • to show relative position of parts in an assembly
slide28

Two adjacent parts hatched in opposite directions

  • More than two parts then different spacing used (smaller parts usually have closer hatching)
  • Large areas of hatching usually not filled in
slide31

Sectioning exceptions

Some shapes are not sectioned even if they lie in the sectioning plane. The following shapes when cut longitudinally are not sectioned:

Shafts, keys, rivets, ribs, pins, bolts, spokes, nuts, webs, washers