MACHINE DRAWING NAME SYED AMER UR RAHMAN B

MACHINE DRAWING • NAME : SYED AMER UR RAHMAN • B. TECH 2 – 2 • TOPIC: SCREW FASTENERS

Flank Root / Core dia Pitch Crest Root NOMENCLATURE OF THREADS out side diameter Lead Nominal diameter Angle

EXTERNAL THREAD INTERNAL THREAD

TYPES OF THREADS T P d 90 T= d = 0. 5 P SQUARE THREAD

TYPES OF THREADS 55° d D d/6 P D=0. 96 P d=0. 64 P WHITWORTH THREAD

TYPES OF THREADS T d 29° p T=0. 3707 p d= 0. 5 p + 0. 25 mm ACME THREAD

d/8 TYPES OF THREADS P d/8 d 45° D=P d = 0. 75 P BUTTRESS THREAD D F

TYPES OF THREADS P D R R=0. 25 P D=0. 5 P KNUCKLE THREAD

48 24 52 40 20 3 100 24 w HEXAGONAL HEADED BOLT WITH HEXAGONAL NUT AND WASHER

RIVETED JOINTS Rivets are used to fasten permanently two or more plates or pieces of metal. Joints made with rivets are called riveted joints. They are commonly used in ship building and for the Construction of steel buildings , bridges , boilers , tanks, etc. Plates joined together by means of a riveted joint cannot be disconnected without Chipping –off rivet heads from one side of the joint Types of riveted joints Lap joint: - In a lap joint the plates to be connected over lap each other Butt joint: - In a butt joint edges of the plates to be connected butt against each other and the joint between them is covered by butt –plates

Pr 1. 5 d Pr t t t d 1. 5 d P P Pd A L Double riveted lap joint A A A Double riveted (zig zag) lap joint

1. 5 d P L A A Single riveted butt joint

FOUNDATION BOLTS These bolts are used for fixing machines to their foundations. Simple forms of these bolts can quickly forged from mild steel or wrought iron bar. These bolts are suspended in hole and cement grout is then poured to fill up the space around them