Atransmission shaft, rotating at 500 rpm drives a milling machine which requires 3.75 kw at 750 rpm. a 300 mm diameter cast iron pulley is mounted on the transmission shaft. a preliminary design proposes using a belt of 4.75 mm thickness, which has a density of 970 kg/m². the allowable stress is 2 mpa. two pulleys rotate in opposite directions and the centre distance of the shafts is 750 mm. the co efficient of friction is 0.3 for both the pulleys. determine the width of the belt.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

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