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Unformatted text preview: and the screws have an efficiency of 80% and a speed ratio of 50:1. The fullload motor speed is 2000 rev/min. Determine: a) When the motor is turned on, how fast will the press head move? b) What is the power rating of the motor, in (ftlbf)/min? c) What is the power rating of the motor, in horsepower (hp)? [Note: look up the electrical horsepower]. 5. A bolted lap joint using SAE grade 5 bolts and members made of colddrawn SAE 1040 steel is shown in the figure. Find the tensile shear load F that can be applied to this connection if the following factors of safety are specified: shear of bolts 1.8, bearing on bolts 2.2, bearing on members 2.4, and tension of members 2.6. Assume the load is evenly distributed on two bolts. Use the minimum yield strength for bolts as the design criteria. The bolt threads do not extend into a shear plane. F F...
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 Winter '10
 Shih

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