Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
3000-4000 kg/cm²
2000-3000 kg/m²
4000-4500 kg/cm²

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Machine Design
The contact ratio is the ratio of

Length of arc of contact 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 approach to the circular pitch

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