A Geneva indexing mechanism used, for example, on the indexing heads of machine tools. Each time the driving arm makes one revolution, the Geneva wheel Locking plate Arm Geneva wheel 100-mm radius FIGURE P9.29 (for the four-slot design illustrated) turns 90?. The arm supports a rolling cylindrical hardened-steel pin that fits into the Geneva wheel slots. The pin is to have the same length and diameter. The wheel is made of heat-treated alloy cast iron (E = 140 GPa, ?? = 0.25). For a design contact stress of 700 MPa, determine the smallest acceptable pin diameter if the design overload torque (normal torque times safety factor) applied to the arm is 60 N • m.

 

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Locking plate Arm Geneva wheel 100-mm radius Locking plate Arm Geneva wheel 100-mm radius

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