Assembly drawings

Machines and mechanisms consist of numerous parts, and a drawing which shows the complete product with all its components in their correct physical relationship is known as an assembly drawing. A drawing which gives a small part of the whole assembly is known as a sub-assembly drawing. A sub-assembly may in fact be a complete unit in itself; for example, a drawing of a clutch could be considered as a sub-assembly of a drawing showing a complete automobile engine. The amount of information given on an assembly drawing will vary considerably with the product and its size and complexity.

If the assembly is relatively small, information which might be given includes a parts list. The parts list, as the name suggests, lists the components, which are numbered. Numbers in 'balloons' with leader lines indicate the position of the component on the drawing (see Fig. 7.3). The parts list will also contain information regarding the quantity required of each component for the assembly, its individual single-part drawing number, and possibly its material. Parts lists are not standard items, and their contents vary from one drawing office to another.

The assembly drawing may also give other information, including overall dimensions of size, details of bolt sizes and centres where fixings are necessary, weights required for shipping purposes, operating details and instructions, and also, perhaps, some data regarding the design characteristics.

Technical Drawing Bolt

Copyright note

Bearing insert

Original scale I : I

Copyright note

Retaining ring

Original scale I : I

Part No. 0001

Part No. 0003

Material : BS1400 : PBIC

Material CS95HT

Fig. 7.1(a) Bearing insert

Fig. 7.1(c) Retaining ring

"I

"I

Standard For Engineering Drawing

No. of teeth and - gear tooth form as part No. 0008

Copyright note

Gear hub

Material BS 970 : 302 S 25

Original scale I : I

Part No 0002

Length

R15

Part No.

Length

Part No.

Length

S123/1

6

/11

26

/2

8

/12

28

/3

10

/13

30

/4

12

/14

32

/5

14

/15

34

/6

16

/16

36

/7

18

/17

38

/8

20

/18

40

/9

22

/19

42

/10

24

/20

Copyright note

Rivet

Material EIC-0

Standard No. S 123

Fig. 7.2 Collective single-part drawing of a rivet

Fig.

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  • christian
    How to draw retaining ring autocad assembly drawing?
    7 years ago
  • adalberta
    How to draw assembly drawing easily?
    7 years ago
  • Regina
    How yo drawin assembly drawings?
    2 years ago
  • mark
    How to draw assemble drawing?
    2 years ago
  • DANYL
    How to assemble part in engineering drawing?
    2 years ago
  • adonay
    How to draw an assembly drawing from a detailed drawing with examples?
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