Page 160 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Exercise 8.30
Double riveted (chain) lap joint (Fig 6)
Draw a double riveted lap joint/chain riveting with 35 mm thick plates. Show a minimum of 3 rivets.
Data:
Dia of rivet = = round to = = 36 mm (approx.)
Pitch p = 3d = 3 x 36 mm = 108 mm
Row pitch (Pr) = 0.8 P or 2d + 6 mm = 86.4 mm or 78 mm
Margin = 1.5d = 1.5 x 36 mm = 54 mm
• Draw the plates one over the other, mark pitch (pr) and lap (l) 54 mm on either side.
• Draw the rivet heads, ends of the plates at lap and beyond short break.
• Hatch the plates in opposite directions.
• Project and draw the top view as in exercise 15.29.
• Show the cutting plane. Show the proportions instead of dimensions in terms of dia of rivet. (Fig 6)

Fig 6

Exercise 8.31

Double riveted (zig-zag) lap joint (Fig 7)
Draw a double riveted zig-zag lap joint, joining 35 mm thick plates.
Data:

Dia of rivet = = = 36 mm (approx.)
Pitch P = 3d = 108 mm
Row pitch (Pr) = 0.8 P or 2d + 6 mm = 86.4 d or 78.0 mm

147
CITS :Engineering Drawing (Mechanical) - Exercise 8