2 Orthographic Projection 3 Orthographic Projection 4 Orthographic Projection 5 SOME TECHNICAL TERMS (page 1) 6 SOME TECHNICAL TERMS (page 1) CAN YOU DETERMINE THE PROJECTION SYSTEM USED (first or third angle) CAN YOU IDENTIFY THE TYPES OF HOLES ABOVE 7 Projection Symbol How to Draw 8 COMMON LINE TYPES (page 5)
1. Continuous Thick (0.5mm) TYPE A
2. Continuous Thin (0.25mm) TYPE B
3. Dashed Thin (0.25mm) TYPE E
4. Chain Thin (0.25mm) TYPE F
10 Leader Lines
To show where dimensions or notes apply.
Always end in arrowheads or dots.
Arrowheads touch and stop on a line
Dots should be within the outline of the object.
Long or intersecting leader lines should not be used.
11 General Points on Drafting
Triangular and Solid
Length 3 x width
Arrows on Dimensions -gt 3-5mm Long
Arrows showing direction of view -gt 7-10mm Long
Text Height Not less than 3mm.
Underlining of text is not recommended.
Notes of a general character to be grouped together.
12 General Points on Drafting 13 Commonly Accepted Symbols and Abbreviations
Hatching is Drawn with Type B (Continuous Thin) Lines equally spaced at 45º.
Preferably not less than 4mm Apart
With very small parts never less than 1mm
On adjacent parts alternate the direction of Hatching.
Correct Section Line Type F (Chain Thin)
21 SECTIONS AND SECTIONAL VIEWS 22 SECTIONS AND SECTIONAL VIEWS 23 SECTIONS AND SECTIONAL VIEWS 24 SECTIONS AND SECTIONAL VIEWS 25 SECTIONS AND SECTIONAL VIEWS
(page 15 BS308)
PARTS NOT NORMALLY SECTIONED WHEN THE CUTTING PLANE PASSES LONGITUDINALLY THROUGH
FASTNERS (bolts nuts) SHAFTS RIBS WEBS SPOKES of WHEELS etc.
26 SECTIONS AND SECTIONAL VIEWS
(page 15 BS308)
FASTNERS AND SHAFT NOT SECTIONED WEB NOT SECTONED 27 (No Transcript) 28 OFFSET SECTIONSECTION IN MORE THAN 1 PLANE 29 EXTRA RESOURCE INFORMATION
DeGarmo E. P. et al. Materials and Processes in Manufacturing 8th Ed. Maxwell Macmillan 1997
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