Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 23, Problem 25QLP
(a) Does the force or torque in drilling change as the hole depth increases? Explain, (b) Drills usually have two flutes. Explain why.
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5. Blind hole 20 mm diameter, 60 mm deep are being drilled in steel stock, drilling spindle speed is
500 rpm, feed 0.3 mm/rev, point angle of drill is 1180. Machining time ( in minutes ) per hole will
be ..
(a) 0.40, (b) 0.42, (c) 0.44, (d) 0.46, (e) 0.48
3. Through hole of 12 mm diameter is to be drilled in a steel plate of 20 mm thickness, drilled spindle
speed is 20 m/min, feed 0.25 mm/rev and drill point angle is 120°, the amount of material removed
at the first 10 sec after full engagement of drill will be ..
(a) 2300, (b) 2400, (c) 2500, (d) 2600, (e) 2700
mm /sec.
3. Explain the function of inserts and jet nozzles in drill bits.
Chapter 23 Solutions
Manufacturing Engineering & Technology
Ch. 23 - Describe the types of machining operations that...Ch. 23 - What is turning? What kind of chips are produced...Ch. 23 - What is the thrust force in turning? What is the...Ch. 23 - What are the components of a lathe?Ch. 23 - (a) What is a tracer lathe? (b) What is an...Ch. 23 - Describe the operations that can be performed on a...Ch. 23 - Why were power chucks developed?Ch. 23 - Explain why operations such as boring on a lathe...Ch. 23 - Why are turret lathes typically equipped with more...Ch. 23 - Describe the differences between boring a...
Ch. 23 - How is drill life determined?Ch. 23 - What is the difference between a conventional...Ch. 23 - Why are reaming operations performed?Ch. 23 - Explain the functions of the saddle on a lathe.Ch. 23 - Describe the relative advantages of (a)...Ch. 23 - Explain how external threads are cut on a lathe.Ch. 23 - Prob. 17RQCh. 23 - Explain the reasoning behind the various design...Ch. 23 - Note that both the terms tool strength and...Ch. 23 - (a) List and explain the factors that contribute...Ch. 23 - Explain why the sequence of drilling, boring, and...Ch. 23 - Why would machining operations be necessary even...Ch. 23 - A highly oxidized and uneven round bar is being...Ch. 23 - Describe the difficulties that may be encountered...Ch. 23 - (a) Does the force or torque in drilling change as...Ch. 23 - Explain the similarities and differences in the...Ch. 23 - Describe the advantages and applications of having...Ch. 23 - Assume that you are asked to perform a boring...Ch. 23 - Explain the reasons for the major trend that has...Ch. 23 - Describe your observations concerning the contents...Ch. 23 - The footnote to Table 23.12 states that as the...Ch. 23 - In modern manufacturing, which types of metal...Ch. 23 - Sketch the tooling marks you would expect if a...Ch. 23 - What concerns would you have in turning a powder...Ch. 23 - The operational severity for reaming is much lower...Ch. 23 - Review Fig. 23.6, and comment on the factors...Ch. 23 - Explain how gun drills remain centered during...Ch. 23 - Comment on the magnitude of the wedge angle on the...Ch. 23 - If inserts are used in a drill bit (see Fig....Ch. 23 - Refer to Fig. 23.11b, and in addition to the tools...Ch. 23 - Calculate the same quantities as in Example 23.1...Ch. 23 - Estimate the machining time required to rough turn...Ch. 23 - A high-strength cast-iron bar 8 in. in diameter is...Ch. 23 - A 0.30-in.-diameter drill is used on a drill press...Ch. 23 - In Example 23.4, assume that the workpiece...Ch. 23 - For the data in Problem 23.45, calculate the power...Ch. 23 - A 6-in.-diameter aluminum cylinder 10 in. in...Ch. 23 - A lathe is set up to machine a taper on a bar...Ch. 23 - Assuming that the coefficient of friction is 0.25,...Ch. 23 - A 3-in.-diameter, gray cast iron cylindrical part...Ch. 23 - Would you consider the machining processes...Ch. 23 - Would it be difficult to use the machining...Ch. 23 - If a bolt breaks in a hole, it typically is...Ch. 23 - An important trend in machining operations is the...Ch. 23 - Review Fig. 23.8d, and explain if it would be...Ch. 23 - Boring bars can be designed with internal damping...Ch. 23 - A large bolt is to be produced from extruded...Ch. 23 - Make a comprehensive table of the process...
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- 1. 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_forwardWhy is speed important in a drilling operation ? What are the results of a drill bit with unequal lips ? Why should you not hold work by hand when drilling ?arrow_forward2. Through hole of 12 mm diameter is to be drilled in a steel plate of 20 mm thickness, drilled spindle speed is 20 m/min, feed 0.25 mm/rev and drill point angle is 120°, the amount of material removed at the first 10 sec after full engagement of drill will be mm/sec. (a) 2300, (b) 2400, (c) 2500, (d) 2600, (e) 2700arrow_forward
- 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,arrow_forwardA number of through holes with 10-mm-diameter have been drilled through 30-mm thick cast iron plate. At a cutting speed of 25 m/min, the high-speed steel drill tool lasted for 44 holes. But, when the cutting speed increased to 35 m/min, the drill tool lasted for only five holes. The feed used in the both cases is 0.08 mm/rev. Determine the values of n and Cin the Taylor tool life equation for the data, where cutting speed v is expressed in m/min, and tool life T is expressed in min.arrow_forwardA student is using a lathe with 80-hp and 80% efficiency to fabricate a copper alloy with Sy = 1200ksi If the width of cut is 0.30 inand the student set a rake angle of 0and a cutting speed of 200fl / min while she assumed a coefficient of friction to be 0.5. What is the maximum depth of cut the student can achieve?arrow_forward
- reply mearrow_forward2. Sketch a radial drilling machine? Explain the working, advantages and disadvantages of a radial drilling machine.arrow_forwardA student is using a lathe with 80-hp and 80% efficiency to fabricate a copper alloy with Sy= 1200 ksi. If the width of cut is 0.30 in. and the student set a rake angle of 0° and a cutting speed of 200 ft/ min while she assumed a coefficient of friction to be 0.5. What is the maximum depth of cut the student can achieve?arrow_forward
- A cutting tool has a nose radius of 1.8 mm the feed rate for a theoretical surface roughness of R= 5 microns is (a) 0.268 mm/rev (b) 0 187 mm/rev (c) 0.036 mm/rev (d) 0.0187 mm/revarrow_forward3. On an upright drilling machine, a 20 mm diameter hole is to be produced in a plate of SAEE112 steel of 30 mm thickness. The cutting speed selected is 10 m/min, and the cutting torque measured is 20 N.m. Calculate the spindle speed, the depth of cut, the main cutting force, and the cutting power.arrow_forwardHow is twist drill manufactured? Explain with neat sketches wherever applicable.arrow_forward
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