Principles of Drawing 39
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d:\N-Design\Des2-1.pm5 Seventh Print
12
54 f28
120
12
f 54120
40
25
ELEVATION VIEW FROM THE FRONT
1 2 3
8
7
4
5
6
15
a-Incorrect b-Correctff^30302 HOLES 10f14 13
15R 11
10
(^169)
PLAN
9090 45
2 HOLES,
DIA 10
45
90
R15
VIEW FROM ABOVE
12
25
30DIA30DIA
Fig. 2.5610. Dimension should be placed above the dimension line (Fig. 2.39).
11. Radius symbol should precede the dimension (Fig. 2.42)
12. Centre lines should cross at long dashes (Table 2.5 B).
13. Dimension should be written by symbol (not abbreviation) followed by its value
(Fig. 2.42).
14. Note with dimensions should be written in capitals.
15. Elevation is not the correct usage.
16. Usage of the term ‘‘plan’’ is obsolete in graphic language.
THEORY QUESTIONS
2.1 Describe the drawing sheet designations and their sizes as per ISO-A series.
2.2 What is the principle involved in fixing the sizes of the drawing sheets?
2.3 What is the information generally provided by the title block and what is its maximum length?
2.4 What do you understand by the terms, (a) borders and frames, (b) centring marks, (c) metric
reference graduation, (d) zoning and (e) trimming marks?
2.5 What are the scales recommended for machine drawing?
2.6 What do you understand by, (a) scale = 5:1 and (b) scale = 1:10?
2.7 List out the standard thicknesses of lines that are used in machine drawing.
2.8 What should be the ratio of thick to thin line used in machine drawing?
2.9 While finishing a drawing, what is the order of priority in the following coinciding lines:
(a) centre lines
(b) visible lines
(c) hidden lines.
2.10 How are leader lines terminated?