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Technical Drawing - Exam Papers - Ordinary - 2007 - Engineering
Question 5
 (Section A) (Section B)  (Part A) (Part B) (Part C)
Answer SECTION A or SECTION B but not both.
SECTION A
(a) Fig.5(a) shows the elevation and end elevation 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.
(b) Using large freehand sketches illustrate the following:
(i) Splined shaft;
(ii) Keyway;
(iii) Stud.
OR
SECTION B
(a) List six CAD 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) Mirror;
(ii) Break;
(iii) Extend.
(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)
- A rectangle is drawn with its lower left corner at (30,30) and its upper right corner
at (190,65)
- The upper corners of the rectangle are chamfered 15 x 15
- A line joins the lower ends of the chamfer lines
- A line AB is drawn using the following co-ordinates: A (75,65) B (75,115)
- The line AB is offset 70mm to the right. This new line is indexed CD (point C is on top)
- A circular arc is drawn to pass through points B, C and point E (110,215)
- A 30mm diameter circle is drawn concentric with the arc
- A 16mm diameter circle is drawn with its centre at point (110,195)
- The circle is the subject of a circular (polar) array consisting of a total of 5 items.
The centre of the array is located at the centre of the three point arc
- A rectangle is drawn with its lower left corner at (85,78) and its upper right corner
at (135,102)
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