Page 65 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Skill Sequence

Layout the spacing for rivet holes to make a single

riveted lap joint

Objectives : At the end of this exercise you shall be able to
• determine the distances between the rivets, distances from the edges of the sheet metal and layout the
spacing of rivets to make double riveted lap joint correctly.

Calculation for layout the spacing of rivet holes is similar as single riveted lap joint except the horizontal distance
between the two rivets rows is thrice the rivet diameter.
Fig 1 shows the layout for spacing of the rivet holes to make double riveted lap joint (chain), on one sheet.
Similarly the layout on another sheet to be made and riveted.

Fig 1

Removing rivets from sheet metal by drilling

Objectives : At the end of this exercise you shall be able to
• remove the rivets from the sheet metal by drilling without
• The most satisfactory method of removing a rivet on light gauge sheet metal is by drilling.

Carry out the following steps:
– Flatten the rivet head by ball peen hammer and punch the exact centre of the former head using a centre
punch. (Fig 1)

Fig 1

– Select a twist drill slightly smaller than the shank dia of the rivet. (Fig 2)

Fig 2

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CITS : C G & M - Fitter - Exercise 64