A Text Book on Engineering Graphics - Central Board of Secondary ...
A Text Book on Engineering Graphics - Central Board of Secondary ...
A Text Book on Engineering Graphics - Central Board of Secondary ...
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MACHINE DRAWING<br />
Example 10 :<br />
Soluti<strong>on</strong><br />
30°<br />
Ød<br />
0.8d<br />
Steps Involved<br />
Draw to scale 1:1, the fr<strong>on</strong>t view, top view and side view <strong>of</strong> a hexag<strong>on</strong>al nut <strong>of</strong> size<br />
M30, keeping the axis perpendicular to H.P. Give standard dimensi<strong>on</strong>s.<br />
Refer Fig 2.20<br />
60°<br />
60°<br />
FRONT VIEW<br />
TOP VIEW<br />
d<br />
1.5d+3<br />
Fig 2.20<br />
(i) Start with the top view, where circles are<br />
seen. Draw a circle <strong>of</strong> diameter d = 30mm.<br />
Describe this circle as disc<strong>on</strong>tinuous circle to<br />
indicate the internal thread <strong>of</strong> a nut.<br />
(ii) Draw an another circle <strong>of</strong> diameter 0.8d =<br />
24mm<br />
(iii) Draw the third circle which is <strong>of</strong> chamfering<br />
circle <strong>of</strong> diameter 1.5d+3 = 48mm.<br />
(iv) Circumscribe a hexag<strong>on</strong> around the<br />
chamfering circle using the 30°- 60° degree<br />
set square and mini drafter as shown in fig<br />
2.21.<br />
Fig 2.21<br />
ENGINEERING GRAPHICS 59<br />
R = d<br />
LEFT HAND SIDE VIEW<br />
HEXAGONAL NUT<br />
d 30<br />
0.8d 24<br />
1.5d+3 48<br />
NOTE : The size <strong>of</strong> chamfer<br />
circle can be taken 1.5d<br />
or 1.5d+3 in square / hex.<br />
head bolt and nut.<br />
30º<br />
30º<br />
HEXAGONAL NUT
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