DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 24, Problem 4P
To determine
The power required for operation.
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Mechanism and Kinematic Terminology
Give three example of a machine for:
generating powert, transmitting energy, and utilizing mechanical energy in the performance of useful work.
An assembly line with 11 tasks is to be balanced. The longest task is 5 minutes, the shortest task is 2 minutes, and the sum of the task times is 25 minutes. The line will operate for 600 minutes per day.
The minimum cycle time isI
minutes and the maximum cycle is
minutes.
The maximum output is
per day and the minimum output is
per day.
A minimum of
work stations is needed if the maximum output rate is to be sought.
A cycle time of
minutes will provide an output rate of 150 units per day.
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b) Fig. 3 shows a graph that has variable drive torque and constant load torque. The load (2
torque is 500Nm with average speed of 30rpm. A complete cycle for the system is
3x radian. Determine thickness of the flywheel if you want to reduce the coefficient
speed of fluctiation from 0.15 to 0.1. Assume the diameter for the flywheel is 50cm
and material used is steel (p =
8050kg/m³)
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Torque (N-m)
cm
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220
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Chapter 24 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 24 - Suppose that you wanted to machine cast iron with...Ch. 24 - How is the feed per tooth related to the feed rate...Ch. 24 - Why must the number of teeth on the cutter be...Ch. 24 - Why is the question of up or down milling more...Ch. 24 - For producing flat surfaces in mass-production...Ch. 24 - Milling has a higher metal removal rate than...Ch. 24 - Which type of milling (up or down) is being done...Ch. 24 - Why does down milling dull the cutter more rapidly...Ch. 24 - What parameters do you need to specify in order to...Ch. 24 - In Figure 24.2b, the tool material is carbide....
Ch. 24 - What is the advantage of a helical-tooth cutter...Ch. 24 - What would the cutting force diagram for Fc look...Ch. 24 - Could the stub arbor-mounted face mill shown in...Ch. 24 - In a typical solid arbor milling cutter shown in...Ch. 24 - Make some sketches to show how you would you set...Ch. 24 - Make some sketches to show how you would set up a...Ch. 24 - Explain how controlled movements of the work m...Ch. 24 - Prob. 18RQCh. 24 - What is the purpose of the hole-circle plate on a...Ch. 24 - You have selected a feed per tooth and a cutting...Ch. 24 - How much time will be required for a milling...Ch. 24 - If the depth of cut is 0.35 in., what is the metal...Ch. 24 - Prob. 4PCh. 24 - Calculate the spindle rpm and table feed (ipm) for...Ch. 24 - A gray cast iron surface 6 in. wide and 18 in....Ch. 24 - Prob. 7PCh. 24 - In Figure 24.12, the feed is 0.006 in. per tooth....Ch. 24 - Suppose you want to do the job described in...Ch. 24 - The Bridgeport vertical-spindle milling machine is...Ch. 24 - The KC Machine Works, which does job shop...
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- 2. You wish to lift a 15,000 lb stone by a vertical distance of 25 ft. Unfortunately, you can only generate a maximum pushing force of 2,500 lb. a. Sketch the diagram representing the problem b. What is the amount of work you must input in order to move the stone? c. What is the actual mechanical advantage (AMA) required by a machine to complete the work above? d. You build a ramp to create the ideal mechanical advantage. What is the length of the ramp in feet?arrow_forwardThe figure above shows a hybrid cutting-extrusion process using a tool of zero-degree rake angle. In this process, the thickness of the chip at the exit of the deformation zone (shear plane), viz. deformed chip thickness (tc), can be controlled a priori to be set at specific values by application of a second constraint tool located directly across from the cutting tool. Note that in this process, tc can be set smaller or larger than the undeformed chip thickness (to). a) When the deformed chip thickness (tc) is set to be twice the undeformed chip thickness (to), what is the shear strain imposed at the shear plane? b) Is there any other deformed chip thickness (tc) setting for which the resulting shear strain is the same as that obtained in a)? Note: You may assume a shear-plane type model for the chip formation.arrow_forward27. You have the following compound machine. For S and ins a. What is the ideal mechanical advantage of this system? The inclined plane dimensions are 7.2 meters length and 1.8 meters height. What effort force is required to move the 600N create? In practice, you need to supply an effort force of 75 N to lift the crate. What is the efficiency? C. How could you redesign this compound d. machine so that the effort force needed was 50 N in practice? Assume the efficiency is your response from part C no matter what changes you make. Be specific with the changes you propose (if you add pulleys state how many, if you change the inclined plane dimensions state the new dimensions, etc.).arrow_forward
- Describe the work done is proportional to the force applied (F ) and the distance traveled (s).arrow_forwardshow a tabulated answer.arrow_forwardQ1. A power-shift crawler tractor is excavating hard materials of earth (clay) and pushing it a distance of 100 ft. The hourly cost of a power-shift crawler tractor is $200. Maximum reverse speeds are: first range, 6 mph; second range, 9 mph; and third range, 11 mph. Rated blade capacity is 18 LCY. Estimate dozer production if the job efficiency factor is 50 min/hr and what is the expected unit cost for dozer work ($/BCY)?arrow_forward
- Explain why efficiency can never be 100% or more on a machinearrow_forward22 Explain any two methods for reducing stress concentration in a machine component with the help of neat diagrams.arrow_forwardProject 4: Pipe lagging is an insulation fitted around pipes to maintain energy loss at minimum and prevent any freezing or bursting. Your part in the HTU thermodynamics and heat transfer lab is to conduct an experiment to explore the heat losses that would occur in both lagged and unlagged hot water pipe. The required tools and main apparatus are shown in Figure.4 and general schematic is shown in Fugure.5. Figure.1, shows the pump for providing running the cycle, thermocouple for measuring the temperature and the pipe coil. Your lab instructor asked you to perform the following tasks: • Fit the lagging around the pipe • Connect the pump to inlet of coil • Measure the hot water terampere at the inlet (make sure the temperature reaches its steady state before measuring it) • Operate the cycle by turn on the pump • Measure the cold water terampere at the outlet in steady state. • Repeat the previous step with unlagged pipe • Search for an appropriate video where a test to measure the…arrow_forward
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