HW _6 Fasteners - and the screws have an efficiency of 80%...

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ME350 W10 HW#6 (Due Thu, March 25) 1. High strength bolts are everywhere. Find a high strength bolt with a head marking, take a picture, and write a short description of the application of the bolt (include the picture, of course). 2. Explain what a ball screw is and its advantages. Find a utility patent of a new ball screw design (show only the first page) and state when the patent expires. You may use the Google Patent or US Patent and Trademark Office (USPTO) web-sites. 3. Explain the mold design used in the injection molding process to create an internal thread. 4. (Problem 8-6 of Shigley) The press shown in the figure has a rated load of 10,000 lbf. The twin single-threaded screws each have Acme threads, a diameter of 2 in, and a pitch of 1/4 in. The coefficients of friction are 0.1 for the threads and 0.05 for the thrust collars (one per screw). The collar mean diameters are 10 in. The gears (worm and spur) between the motor
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Unformatted text preview: and the screws have an efficiency of 80% and a speed ratio of 50:1. The full-load 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 (ft-lbf)/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 cold-drawn 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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HW _6 Fasteners - and the screws have an efficiency of 80%...

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