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SSM College of Engineering and

Technology

2nd

SEMESTER (ALL BRANCHES)

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T.SHEET 1

Q.1. Draw the Orthographic views of the following figures and show appropriate sectioning.

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T. SHEET NO:- 2 RIVETS AND RIVETED JOINTS

Fasteners: The devices used for holding together two parts of a machine or structure are called fasteners or fastenings.

Classification:

Fasteners are of two types:

a. Temporary fastenersb. Permanent fasteners

Temporary fasteners allow easy unfastening of the parts connected, without injuring the fastening element. e.g. nuts and bolts, screws, studs etc.

Permanent fasteners cannot open without breaking the element. e.g.Riveting, soldering, welding, brazing etc.

RIVETS

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Q.1. Draw the various types of rivet heads, giving suitable dimensions.

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RIVETED JOINTS

Riveted joints are of two types:

a. Lap jointb. Butt joint

FIG:- SINGLE RIVETED LAP JOINT

Important formulae:Lap Joint:Margin distance = 1.5D

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Row pitch = 2D in case of zigzag riveting and 2D+6 in case of chain riveting.Column pitch = 3D

Butt joint:Margin = 1.5DRow pitch = 2D in case of zigzag riveting and 2D+6 in case of chain riveting.Column pitch = 3DMain plate thickness = tCover plate = 0.625t in case of double strap and 1.125t in case of single strap.Bottom plate = 0.625t

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WELDINGSymbolic representation of welds:

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SCREWED FASTENING

Q.1 Draw/sketch and label the elements of a screw thread indicating the main features.Q.2 Draw the various thread profiles.Q.3. Draw the three views of a hexagonal nut

A. by standard methodB. by rough rule.

Q.4 Draw the three views of a square nut.Q.5 Draw the two views of a. flanged nut b. capstan nut c. castle nut d. wing nut e. knurled nut

f. dome nut g. slotted nutQ.6. Sketch the various foundation bolts.Q.7. Draw the three views of the following assembly:

a. hexagonal headed bolt, washer, hexagonal nut.b. hexagonal headed bolt, washer, square nut.c.square headed bolt, washer, hexagonal nut.d.hexagonal headed bolt, washer, hexagonal nut and lock nut.

Q.8. Draw a studded joint for joining a plate of thickness 30mm using a stud of 25mm diameter. Also use a lock nut.

Q.9. Draw in two views a. eye bolt b. countersunk headed bolt.

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SQUARE HEADED BOLT AND NUT (INCLINED)

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SQUARE HEDED BOLT AND NUT (UNINCLINED)

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HEXAGONAL HEADED BOLT AND NUT

FLANGED NUT

SPHERIRICALLY SEATED NUT

DOMED CAP NUT

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SLOTTED NUT

KNURLED NUT

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LOCK NUT

DIMENSIONS

S.NO DESCRIPTION DIMENSIONSWASHER

1. Diameter of washerThicknessAngle of Chamfer

2D+30.12D300

HEXAGONAL NUT STANDARD DIMENSIONS2. Height of the nut

Width across flat surfaceAngle of chamferRadius of chamfer

D1.5D+3 mm300

1.4DHEXAGONAL NUT ROUGH RULE DIMENSIONS

3. Height of the nutDistance across diagonally opposite corners

D2D

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Angle of chamferRadius of chamfer

300

1.5DSQUARE NUT DIMENSIONS

4. Height of the nutWidth across flat surfaceAngle of chamferRadius of chamfer

D1.5D+3300

2D

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FOUNDATION BOLTS

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T. SHEET: 4

JOINTS

Cotter and pin joints

A. SOCKET AND SPIGOT COTTER JOINT

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