The stresses in a powered screw include: ___________________________. True or False with explanation For both shaft design and spring design, the running frequency should be at least two times lower than the first mode of natural frequency. True_ False__. The major stress in a spring comes from the direct shear. True_ False__. The natural frequency of a spring can be reduced by reducing the weight of the wire. True_ False__.

Question 3 The design of journal bearings usually involves two suitable combinations of variables: variables under control and dependent variables or performance factors. As such, a full journal bearing has a shaft journal diameter of 27 mm with a unilateral tolerance of 20.01 mm. The bushing bore has a diameter of 27.04 mm with a unilateral tolerance of 0.03 mm. The //d ratio is unity. The bushing load is 1.03 kN, and the journal rotates at 1153 rev/min. You are required to analyze the minimum clearance assembly if the average viscosity is 50 mPa.s to find the minimum oil film thickness, the power loss, and the percentage of side flow.

! Required information A helical coil compression spring is needed for food service machinery. The load varies from a minimum of Fmin 4 lbf to a maximum of Fmax 16 lbf. The spring rate k is to be 9.5 lbf/in. The outside diameter of the spring cannot exceed 2.5 in. The spring maker has available suitable dies for drawing 0.08-in-diameter wire. Use a fatigue design factor nfof 1.5 and the Gerber-Zimmerli fatigue-failure criterion. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the values for each of the following for a value of 0.08 in: The torsional modulus of rupture, Ssu, is 163.7 kpsi. Torsional yield strength, Ssy, is 85.5 kpsi. The endurance strength, assuming unpeened spring wire, Sse, is The value of the mean diameter, D, is 0.662 ✔ in. shear stress, Ta, is The fatigue factor of safety, nf, is The free length, Lo, is The critical length, LO(cr), is The alter 1.32 x in. in. kpsi. 39.5 kpsi.

can you please find the solution question no:27

6-4

Part D - Present the equations of motion for the system, including the rate of change of deflection. Make sure to simplify your equations as much as possible.

Please provide the correct answer choice

can you please find the solution question no:12

! Required information A steel shaft is to be designed so that it is supported by roller bearings. The basic geometry is shown here, with L = 325 mm, a = 32.5 mm, and F= 3400 N. To achieve a reasonable bearing life, the allowable slope at the bearings is 0.0025 mm/mm. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. With the diameter known, what is the maximum deflection of the shaft? The maximum deflection of the shaft (ymax) is - mm.

A portion of the shaft where a gear is to be mounted has a diameter of  1.5in. The gear transmits 3000 lb.in of torque.  The shaft is made of SAE 1040 OQT400 steel, the gear is made of SAE 8650 OQT1300 steel, and the key is made of SAE 1045. The minimum required length for this key is most likely:     0.5in     2.5in     3.0in     1.0in     1.5in