Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.124 - (0.684/T)
0.175 - (0.841/T)
0.154 - (0.912/T)
None of these

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Machine Design
Spring index is

Indication of quality of spring
Load required to produce unit deflection
Its capability of storing energy
Ratio of coil diameter to wire diameter

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