Technical Drawing - Exam Papers - Ordinary - 2007 - Engineering

Question 4

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(a) Using the data table below make a fully dimensioned drawing of the machine part in Fig. 4(a), showing all specifications.

1 Diameter 40, Length 50, Chamfer 6 x 6, Fillet radius 10,
Screwthread Metric 20, Pitch 2.5, Depth of thread 20
2 Diameter 84, Length 28, Chamfer 4 x 4, Finish diamond knurl
3 Diameter 50, Length 36, Diameter 16 hole through centre
4 Minimum diameter 30, Length 40
5 Undercut 4 x 4
6 Length 30, Screwthread Metric 20, Pitch 2.5

(a) Fig. 4(b) shows a part section through a portion of a typical engine.

(i) Draw a parts list, in table format, which includes the item number and name for each of the parts 1, 2, 3, 4 and 5.

(ii) Explain, with the aid of freehand sketches, the operation of the engine mechanism.

(c) Using large freehand sketches, explain the following engineering terms associated with an
engine:

(i) Piston;
(ii) Connecting rod;
(iii) Gudgeon pin.

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