Technical Drawing - Exam Papers - Ordinary - 2007 - Engineering
Question 4
(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.
