Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133559897
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 24, Problem 6RQ
What is the difference between feed and feed per tooth? Can they ever be the same?
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Identify and explain the method of milling process in which the stresses on the teeth is maximum at the end of the cut with neat diagram.
A two-spindle drill cuts two holes at the same time, one 1/2 inch and one 3/4 inch. The workpiece is 1.0 inches thick. Both drills have point angles of 118 degrees and the cutting speed for the material is 300 ft/min. The rotational speed of each drill can be set individually but the feed rate for both holes must be set to the same value because they move together into the material. The feed rate is set so that the total metal removal rate of both drills combined does not exceed 1.50 in3/min. Determine (a) maximum feed rate (in/min) that can be used, (b) individual feeds (in/rev) for each hole, and (c) cutting time for the operation.
A drilling operation is to be performed with a 12.7 mm diameter twist drill in a steelwork part. The hole is a blind hole at a depth of 60 mm and the point angle is 118 ̊. The cutting speed is 25 m/min and the feed is 0.3 mm/rev.
determine The cutting time to complete the drilling operation,
Chapter 24 Solutions
Manufacturing Engineering & Technology
Ch. 24 - Explain why milling is such a versatile machining...Ch. 24 - Describe a milling machine. How is it different...Ch. 24 - Describe the different types of cutters used in...Ch. 24 - Define the following: face milling, peripheral...Ch. 24 - Can threads be machined on a mill? Explain.Ch. 24 - What is the difference between feed and feed per...Ch. 24 - Explain the relative characteristics of climb...Ch. 24 - Describe the geometric features of a broach and...Ch. 24 - What is a pull broach? A push broach?Ch. 24 - Why is sawing a commonly used process? Why do some...
Ch. 24 - What advantages do bed-type milling machines have...Ch. 24 - Explain why the axis of a hob is tilted with...Ch. 24 - What is a shell mill? Why is it used?Ch. 24 - Why is it difficult to saw thin sheet metals?Ch. 24 - Of the processes depicted in Fig. 24.2, which is...Ch. 24 - Describe the tool motion during gear shaping.Ch. 24 - When is filing necessary?Ch. 24 - Would you consider the machining processes...Ch. 24 - Why is end milling such an important versatile...Ch. 24 - List and explain factors that contribute to poor...Ch. 24 - Explain why broaching crankshaft bearings is an...Ch. 24 - Several guidelines are presented in this chapter...Ch. 24 - What are the advantages of helical teeth over...Ch. 24 - Explain why hacksaws are not as productive as band...Ch. 24 - What similarities and differences are there in...Ch. 24 - Why do machined gears have to be subjected to...Ch. 24 - How would you reduce the surface roughness shown...Ch. 24 - Why are machines such as the one shown in Fig....Ch. 24 - Comment on your observations concerning the...Ch. 24 - Explain how contour cutting could be started in a...Ch. 24 - Prob. 32QLPCh. 24 - Describe the parts and conditions under which...Ch. 24 - Explain the reason that it is difficult to use...Ch. 24 - Would you recommend broaching a keyway on a gear...Ch. 24 - Prob. 37QTPCh. 24 - A slab-milling operation is being performed at a...Ch. 24 - Show that the distance lc in slab milling is...Ch. 24 - Prob. 40QTPCh. 24 - Calculate the chip depth of cut, tc, and the...Ch. 24 - Estimate the time required to face mill a...Ch. 24 - A 12-in.-long, 1-in.-thick plate is being cut on a...Ch. 24 - A single-thread hob is used to cut 40 teeth on a...Ch. 24 - Assume that m the face-milling operation shown in...Ch. 24 - A slab-milling operation will take place on a part...Ch. 24 - Prob. 47QTPCh. 24 - In describing the broaching operations and the...Ch. 24 - The parts shown in Fig. 24.1 are to be machined...Ch. 24 - Would you prefer to machine the part in Fig. 24....Ch. 24 - Prob. 51SDPCh. 24 - Suggest methods whereby milling cutters of various...Ch. 24 - Prepare a comprehensive table of the process...Ch. 24 - Prob. 55SDPCh. 24 - Make a list of all the processes that can be used...
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- A 0.4-inch diameter bit is used in a vertical or vertical drill that operates at 300 rpm. If the feed is 0.005 in / rev, what is the MRR? What is the MRR if the drill diameter is doubled? What is the power required in the drill if the material is an annealed AISI 1080?arrow_forwardExplain how the size of an upright drill press is determined.arrow_forwardWhat is feed, and how is feed stated for drill press operations?arrow_forward
- When roughing a pocket, should you machine in a clockwise or counterclockwise direction, and why?arrow_forward8 A job has to be machined in shaping and the process parameters are given below: a. Length of the job=120 mm b. Speed of the motor=640 rpm c. Cutting speed=264 m/min d. Tool allowance before cutting =30 mm e. Tool allowance after cutting=15mm Determine the cutting to return stroke ratio for the above operation and draw the arrangement of machining with tool head and allowances.arrow_forwardA job has to be machined in shaping and the process parameters are given below: Length of the job=120 mm Speed of the motor=640 rpm Cutting speed=248 m/min Tool allowance before cutting =31.5 mm Tool allowance after cutting=10 mm Determine the cutting to return stroke ratio for the above operation and draw the arrangement of machining with tool head and allowances.arrow_forward
- 1.) On a lathe, a cylindrical work piece of 100mm diameter is being turned. The RPM is 100. The cutting speed is _________?(m/min)arrow_forward1. A 7.5 -mm-diameter drill is used on a drill press operating at 300 rpm. If the feed is 0.125 mm/rev, what is the MRR? What is the MRR if the drill diameter is doubled? 2. Assume that the work piece material is high-strength aluminum alloy and the spindle is running at N = 500 rpm. Estimate the torque required for this operation.arrow_forwardA twin-spindle drill simultaneously drills one ½-in hole and one ¾" through a 1" wide work piece. Both holes are twist drill with 118° point angles. cutting speed for material is 230 ft/min. The rotation speed of each spindle can be configured individually. The feed rate of both holes must be set to the same value, since both spindles go down at the same speed. The forward speed is set in such a way that the speed total metal removal does not exceed 1.50 in3 /min. Determine: a) the velocity maximum feedrate (in/min) that can be used, b) the individual feedrates (in/rev) that result in each hole and c) the time required to drill the holes.arrow_forward
- How did you find out the angle was 90 and how can you find that for other problems?arrow_forwardWhat is the effect of rake angle (ranging from highly +ve to –ve) on chip formation, cutting force and power requirements?arrow_forwardIn orthogonal turning of low carbon steel pipe with principal cutting edge angle of 90°, the main cutting force is 1000 N and the feed force is 800 N. The shear angle is 25° and orthogonal rake angle is zero Employing Merchant's theory, what is the ratio of friction force to normal force acting on the cutting tool?arrow_forward
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