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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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_forwardCheck the picturearrow_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_forward
- Q1. 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_forwardExample 21.2 The torque developed by an engine is given by the following equation: T=14 250 +2200 sin 20-1800 cos 20 where Tis the torque in N-m and 0 is the crank angle from the inner dead centre position. The resisting torque of the machine is constant throughout the work cycle. 1The coefficient of speed fluctuations is 0.01. The engine speed is 150 rpm. A solid circular steel disk, 50 mm thick, is used as a flywhekl. The mass density of steel is 7800 kg m. Calculate the radius of the flywheel disk.arrow_forwardExplain why efficiency can never be 100% or more on a machinearrow_forward
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