each part A - A weight of 1500 N must be lifted. What is the total required torque necessary to lift this weight? Give your answer in units of N m. Part B - if the available power to drive the screw is 1,011 Watts, determine the fastest speed at which the weight can rise. Give your answer in units of mm/s, Part C - The efficiency of the preceding power screw (expressed as a number between 0 and 1, not as a percentage) is ? Part D - Suppose a high-quality thrust bearing was used to eliminate the collar friction. The efficiency of the screw would now b

each part A - A weight of 1500 N must be lifted. What is the total required torque necessary to lift this weight? Give your answer in units of N m. Part B - if the available power to drive the screw is 1,011 Watts, determine the fastest speed at which the weight can rise. Give your answer in units of mm/s, Part C - The efficiency of the preceding power screw (expressed as a number between 0 and 1, not as a percentage) is ? Part D - Suppose a high-quality thrust bearing was used to eliminate the collar friction. The efficiency of the screw would now b

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter6: Fasteners

Section: Chapter Questions

Problem 12RQ

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In the shown connection, the coefficient of friction is 0.05. Calculate the minimum allowable tightening torque to carry the load F=1000N. If high tensile bolt 9.8, calculate the design factor of safety.
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4. A square-threaded power screw has a mean diameter, dm = 1.75 in and a pitch, p = 0.875 in. The coefficient of thread friction is 0.10 and the collar friction is negligible. What horsepower is required to raise a weight of 3000 lbf at a rate of 20 ft/min?
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Answer TWO QUESTIONS only. Only tables and charts are allowed Q1. A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 4000 N. A plain thrust collar of 50-mm mean diameter is used. Coefficients of running friction are estimated as 0.12 and 0.09 for f and fc, respectively. (a) Determine the screw pitch, lead, thread depth, mean pitch diameter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. (c) Estimate the efficiency of the jack when raising the load.
34 in 3. The following data apply to the C-clamp: a. The screw is ACME with ¾" Diameter b. Coefficient of thread friction = 0.12 c. Coefficient of collar friction = 0.23 d. Mean collar radius = 0.55 in. e. Max. clamping force = 1000 lb Determine: The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p))
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What tolerance class is specified for the thread? h class?
A full journal bearing has a nominal diameter of 60.0 mm, a bearing length of 30.0 mm and supports a load of 3200 N when running at the design speed of 3200 rpm. The radial clearance has been specified as 0.04 mm. An SAE 20 oil has been chosen and the lubricant supply system is capable of delivering the lubricant to the bearing at 60oC. Using the Raimondi and Body design charts;1.1 find the temperature rise of the lubricant, (19)1.2 the total flow rate required, (1)1.3 the torque required to overcome friction (3)1.4 and the power dissipated in the bearing.
2. A cylinder with a nominal 2.5 inch ID, a 4.0 inch OD, and a 3.0 inch length is to be mated with a solid shaft with a nominal 2.5 inch diameter. The cylinder and shaft are made from steel, with Sy = 100 kpsi and E 30 Mpsi. The coefficient of friction for the steel interface is 0.7. = The maximum and minimum allowable diameters for both the cylinder hole and the shaft are given as Dmax=2.5012 inch, Dmin=2.5 inch; dmax=2.5028 inch, dmin=2.5021 inch (a) (b) Determine the maximum amount of torque that can be transmitted through this joint, assuming the shaft and cylinder are manufactured within their tolerances. Determine yielding condition for the cylinder, due to the stress from the interference fit. Use the Von Mises yielding theory.
How the sec (alpha) value is measured 29/2? Can you please describe the circled line in details.Thank you
Question 5 a) Calculate the Pitch diameter for the following thread. Given the measurement over the wires is 0.3130. Show your steps. Is the obtained value being acceptable? Why. b) Why the Pitch Diameter is important. Explain..show schematics Nominal Size, Class Маx Маjor Min Major Max Pitch Diam Min Pitch Diam TPI, Series Diameter Diameter 5/16-18 UNC 2A (Ext) 0.3113 0.3026 0.2752 0.2712