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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)
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