Machine Design
The backlash for spur gears depends upon

Module
Pitch line velocity
Tooth profile
Both module and pitch line velocity

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Radial load only
Both radial and axial loads and the ratio of these being greater than unity
Axial load only

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Machine Design
The contact ratio is the ratio of

Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of contact to the circular pitch

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