One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening a screw
Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
C. Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
1.2 d
1.6 d
2d
2.5 d
Base circle
Pitch circle
Prime circle
Pitch curve
Nickel
Chromium
Nickel and chromium
Cobalt and molybdenum
Dynamic loading
Static loading
Combined static and dynamic loading
Completely reversed loading
Thick lubricated bearings
Plastic bearings
Antifriction bearings
Thin lubricated bearings
Metric
Buttress
Acme
Square
Metric
Buttress
Square
NPT (national pipe threads)
Gd⁴/ 8D3n
Gd3/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
1.06
1.12
1.26
1.58
120°
180°
270°
360°
Right hand with same pitch
Left hand with same pitch
Could be left or right hand
Right hand with fine pitch
(1/2) × √(σ² + 4τ²)
√(σ² + 4τ²)
(1/2) × [σ + √(σ² + 4τ²)]
σ + √(σ² + 4τ²)
Low efficiency
High efficiency
High load lifting capacity
High mechanical advantage
W/2
2W/3
W/9
8W/9
10 m/s
12.5 m/s
15 m/s
20 m/s
The belt should touch the bottom of groove in the pulley
The belt should not touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of the above
Compression
Tension
Shear
Combined loads
Initial tension
External load applied
Sum of the initial tension and external load applied
Initial tension or external load, whichever is greater
Tensile stress
Compressive stress
Direct shear stress
Torsional shear stress
Material of belt
Material of pulley
Materials of belt and pulley
Belt velocity
Yes
No
Sometimes
Rarely
Elastic limit
Strain
Factor of safety
Bulk modulus
10
15
20
25
Low
High
Moderate
None of these
Heavier
Lighter
Moderate
None of these
F + P
F P
P
F
Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires in two adjacent strands are twisted in opposite direction
Wires are not twisted
Higher
Lower
Same
None of these
Foundation purposes
Absorbing shock and vibrations
Transmission of power
Lifting and transportation of machines and cubicles