Page 68 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS
Double riveted lap joint (Zig Zag Seam)

Objectives : At the end of this exercise you shall be able to
• layout the spacing of rivets for double riveted lap joint (zig zag seam) form the rivet heads of flat head rivets to
make double riveted (zig-zig) lap joint without slackness.

Job Sequence

• Cut the two pieces 80 x 70 using a straight snip and check the size using a steel rule.
• Flatten the sheet on the dressing plate by a mallet.
• Deburr the edges using a flat smooth file.

• Layout the spacing for rivet holes to make double riveted (zig-zag) lap joint using a scriber, a divider and a steel
rule on both the pieces of the sheet (i.e sheet ‘A’ and sheet ‘B’). (Fig 1)

Fig 1

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CITS : C G & M - Fitter - Exercise 64