When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(WD/ πd3) × K

(4WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

(WD/ πd3) × K

(4WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

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Machine Design
In oilness bearings

The oil film pressure is generated only by the rotation of the journal

Grease required to be applied after some intervals

Do not require external supply of lubricant

The oil film is maintained by supplying oil under pressure

The oil film pressure is generated only by the rotation of the journal

Grease required to be applied after some intervals

Do not require external supply of lubricant

The oil film is maintained by supplying oil under pressure

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Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

5 d

4 d

3 d

2 d

5 d

4 d

3 d

2 d

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Soft key

Hollow key

Hollow saddle key

None of these

Soft key

Hollow key

Hollow saddle key

None of these

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Machine Design
The square threads are usually found on

Spindles of bench vices

Feed mechanism of machine tools

Railway carriage couplings

Screw cutting lathes

Spindles of bench vices

Feed mechanism of machine tools

Railway carriage couplings

Screw cutting lathes

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Machine Design
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Smaller

Larger

Larger/smaller depending on diameter of spring coil

Equal

Smaller

Larger

Larger/smaller depending on diameter of spring coil

Equal

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Machine Design

Machine Design In oilness bearings

Machine Design In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

Machine Design A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Machine Design The square threads are usually found on

Machine Design The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Machine Design
In oilness bearings

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Machine Design
The square threads are usually found on

Machine Design
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is