Machine Design

4. Two identical steel plates are each 1 in thick, and are compressed with one bolt (1/4-20 UNC grade 8) and nut. Washers are used under the head of the bolt and under the nut. a) Determine a suitable length of the bolt, rounded up to the nearest 1/4" b) Determine the bolt stiffness, assuming E = 30x10^6. c) Determine the stress on the bolt if the preload is 3 kip, and service load is 15 kip, and material stiffness is 12.69 Mlbf/in.

Fatigue Design A cold drawn AISI 1020 CD steel link is subjected to axial loading (that fluctuates from 0 to 2 kN) by pins that go through the holes. Determine the critical tensile area (mm²) through the hole. Determine the mean and alternating axial stresses. Determine the safety factor against fatigue failure using the Soderberg failure criteria given:

Design a single-reduction, spur gear-type speed reducer with all components. Specify the two gears, two shafts, four bearings, and a housing (with fasteners). This gearbox must fit into the condition shown below: A water turbine transmits 50 kW of power to a pair of gears at 4500 rpm. The output of the gear pair must drive an electric power generator at 3600 rpm. The center distance for the gear pair requires not to exceed 150 mm. Project Requirements: 1. Design the gearbox. Show all calculations, selection processes, and detailed analysis. 2. Make detailed component drawings for two shafts and the housing. 3. Demonstrate an assembly drawing for the gearbox. Submission: 1. A completed project report with your design, analysis, and drawing. Save your report as a PDF file. 2. A zip file includes all your CAD drawings.

2) Device is lifting 250kg motor. Calculate following forces. a) force acting on cylinder H (Between points F and B) b) force in rod BD c) force in joints C and E 1m - 2 m 2m H -1m E 2 m D T 1 m

A car weighs 2200 lb, with 65% of this weight on the front tires. Assume all four tires are inflated to 32 psig at 10°F, and the tires carry no vertical loads in their side walls. Atmospheric pressure is 14.7 psi. Find the total contact area between the tires and the road [in']. Now assume the temperature rises to 100°F with no leakage or volume change. What will be the total tire-road contact area now [in?1?

2. (5 Points) : Choose a device or product that you believe can be improved upon. Answer the following questions: a) what do you already know about this device/ product; b) what are the main functions of this device/ product; and d) Is there a room for improvements? Write a short report to summarize your findings.

On the part below, apply position controls to allow the holes to move 0.4 side to side, butonly .1 in the up and down direction. Include references to datum features A, B, and C in thefeature control frames. [5 pts.]

4. (2 points) Show a test matrix for a two-level full factorial experimental design where the three factors to be investigated are: Color (Red/Blue), Shape (square/hex), and Size (big/little). Include the levels for the 2-factor interactions.

3. On the part below, apply a cylindrical position control of 0.25 @ MMC with respect to datums A, B, and C. [10 pts.]

A V-block clamp consists of 3 components a base, yoke and adjusting screw. Using a rule, measure the sketches below and produce a 3rd angle projection drawing for each component. All drawing must be fully dimensioned, with the relevant projection symbol, on a completed drawing sheet. Indicate the important tolerances for each component. A completed 2 view assembly drawing is also required showing each component in its relevant position,with information bubbles relating to a parts list on the drawing. The parts list must indicate, part name,page number, material, and number off, for each component.