# Technical Drawing - Exam Papers - Ordinary - 2006 - Engineering

### Question 5

Answer SECTION A or SECTION B but not both.

SECTION A

(a) Fig. 5(a) shows the elevation and plan of a machine casting. Draw an isometric view of the casting with the portion in front of the section plane A-A removed.
Point P is to be the lowest point on the drawing.

OR

SECTION B

(a)
List, in the order in which they would be used, six Computer Aided Drawing commands necessary to produce the drawing in Fig 5(b).

(b)
By means of sketches and a short note, explain the purpose of the following commands:
(i) Lengthen;
(ii) Pan;
(iii) Zoom.

(c)
Using a large freehand sketch, draw the object shown in Fig. 5(c) as a wireframe representation.

(d)
Draw, full size, the object that would be displayed on a CAD system when the following commands are executed:
(All points (X,Y) are specified using absolute co-ordinates. The origin (0,0) is located at the lower left corner of the display)

• Five lines AB, AE, EF, FG and GH are drawn using the following co-ordinates:
A (50,50) B (90,50) E (50,184) F (60,184) G (60,100) H (140,100)
• From B, a line is drawn to C, which is defined by the relative polar coordinates @40<60
• From C, a line is drawn to D, which is defined by the relative polar coordinates @30<0
• The lines FG and GH are filleted at G with a radius of 15mm
• A polyline KL, with a width of 5mm, is drawn using the following co-ordinates:
K (60,174) L (70,174)
• The shape drawn, is then mirrored about the line DH
• A circle, of 140mm diameter, is drawn with its centre point at (140, 174)
• A rectangle is drawn with its lower left corner at (101,130) and its upper right corner at (113,138)
• This rectangle is duplicated 16 times in a rectangular array consisting of four rows and four columns. There is an 18mm array distance between the rows and a 22mm array distance the between the columns.
• A rectangle is drawn with its lower left corner at (101,204) and its upper right corner at (179,219)