Page 159 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

• Draw a centre line.

• Follow the procedure of earlier exercisesand complete the rivet head. (Fig 4)

Fig 4

Exercise8.29

Single riveted lap joint
Draw a single riveted lap joint, joining 25 mm thick plates. Show minimum 3 rivets.
Calculations:

Dia of rivet = = = 6 x 5 = 30 mm
Pitch of rivet = 3d = 3 x 30 = 90 mm
Margin from rivet hole to end of plate = 1.5d = 1.5 x 30 = 45 mm.
• Mark vertical centre line.
• Draw three horizontal lines 25 mm apart in front elevation.
• Form the rivet heads (on 30 mm shank) on the centre line.
• Draw the plates and section them as shown
• Draw the rivet head circle and hidden circles for shank dia.
• Draw the edge of the plates in front view at 80° - 85°.
• Project the edges on to top view.
• Mark two pitch distances of 90 mm each.
• Draw visible edges of plates and rivets in firm lines. (Fig 5)

Fig 5

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CITS :Engineering Drawing (Mechanical) - Exercise 8