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Chapter 11: Miscellaneous Types of fasteners

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1 Chapter 11: Miscellaneous Types of fasteners
Key is a piece of steel lying partly in a groove in the shaft and extending into another groove in the hub. Keyseat is the groove in the shaft Keyway is the groove in the hub or surrounding part

2 MISCELLANEOUS FASTENERS
TYPES OF KEYS

3 MISCELLANEOUS FASTENERS
TYPES OF KEYS

4 Dimensioning of Keyseats
Width Depth Location Length (if required)

5 MISCELLANEOUS FASTENERS
DIMENSIONING KEYSEATS

6 Splines & Serrations A splined shaft is a shaft having multiple grooves cut around its circumference for a portion of its length in order that a sliding engagement may be made with corresponding internal grooves of a mating part

7 MISCELLANEOUS FASTENERS
SPLINES

8 Semipermanent pin fasteners
Pin fasteners: an inexpensive and effective method of assembly when loading is primarily in shear Semipermanent pin fasteners Machine pins Radial locking pins Quick-release pins Push-pull pins Positive locking pins: cotter pins, single acting pins, double acting pins

9 Stamped Wire-formed Spiral-wound
Retaining rings or snap rings are used to provide a removable shoulder to accurately locate, retain or lock components on shafts and in bores of housings Stamped Wire-formed Spiral-wound

10 Springs Dimension: size, shape, material, diameter, pitch, shape of ends, length
Controlled action Variable action Static Types of springs Compression Extension Torsion Power

11 MISCELLANEOUS FASTENERS
SPRING NOMENCLATURE

12 MISCELLANEOUS FASTENERS
TYPES OF SPRINGS

13 Rivets Basically a rivet is a ductile metal pin that is inserted through holes in two or more parts and having the ends formed over to securely hold the parts Large: structural work of buildings and bridges Aerospace equipment Small Blind: blind riveting is a technique for setting a rivet without access to the reverse side of the joint

14 MISCELLANEOUS FASTENERS
LARGE RIVETS

15 MISCELLANEOUS FASTENERS
RIVETED JOINTS

16 MISCELLANEOUS FASTENERS
RIVETED JOINTS

17 MISCELLANEOUS FASTENERS
CONVENTIONAL RIVET SYMBOLS

18 11.6 Welded Fasteners and 11.7 Adhesive Fasteners
A resistance-welded fastener is an externally or internally threaded metal part designee to be fused permanently in place by standard welding equipment Stress on bonded joints Tensile Shear Cleavage peel

19 Stresses in bonded joints


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