Page 179 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Thickness = 2/3 x W

Length range = 80 to 360 mm
Length = 2 x 100 mm = 200 mm
Width = 28 mm
Thicknes = 16 mm
Chamfer S = 0.6 to 0.8 mm
Type A - both ends round
Type B - both ends square

Type C - one end square and one end round

Fig 2

Exercise 8.39

Draw the assembly of parallel keys on shaft of diameter 100 mm using general formula. (Fig 3)
Parallel key Type A to suit shaft dia 180 mm
General formula for all keys = dia of shaft d
width of key = 0.25 d + 2 mm
Thickness of key = 0.33 W (1/3 W)

Length of key = 2d
Width = 0.25 x 100 + 2 = 27 mm
Thickness = 1/3 W = 27/3 = 9 mm
Length 2d = 200 mm.

Fig 3

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CITS :Engineering Drawing (Mechanical) - Exercise 8