Machine Design
The anti-friction bearings

Have low starting and low running friction at moderate speeds
All of these
Have high initial cost
Can carry both radial and thrust loads

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Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Concerned with strength of wire of spring
Its capability of storing energy

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Machine Design
A hollow saddle key is

A taper key which fits half in the key way of hub and half in the key way of shaft
A taper key which fits in a key way of the hub and is flat on the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

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