DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 23, Problem 3P
The lathe in problem 2 has rpm settings of 20, 30, and 35 that are near the calculated value. What rpm would you pick, and what will actual cutting speed be?
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QUESTION 5
Determine the spindle speed (rpm), the feed rate (in/min) and the cutting power required for turning a 1º diameter copper rod with a depth of cut of 0.1" using a cemented carbide tool.
O N=287 RPM, F-25.8 in/min, P=9.7 hp
ON=2866 RPM, F=258 in/min, P=97 hp
ON=1146 RPM, F-25.8 in/min, P=97 hp
O N= 11460 RPM, F-340 in/min, P=130 hp
ON= 1146 RPM, F-34 inimin, P= 13 hp
ON= 115 RPM, F-3.4 in/min, P=1.3 hp
QUESTION 6
It is required to face mill an aluminum block to size it down from 2" to 1.5" thick using a 3" diameter 2-toothed carbide cutting tool. The block is 6.0" wide and 6" long. The entire tool diameter
engages the workpiece during the cut.
Calculate the recommended spindle speed in revolutions per minute, feed per tooth, and cutting power required.
O N=1529 RPM, f= 0.026 in/rev/tooth, P = 36 hp
O N-3820 RPM, f= 26 in/revitooth, P=27 hp
O N-3820 RPM, f= 0.052 in/rew/tooth, P=27 hp
ON-382 RPM, F= 0.026 in/revitooth, P = 0.027 hp
O N-3820 RPM, f= 0.052 in/rev/tooth, P=2.7 hp…
Write the NC part program for the part. Holes are threaded and requires two tools; T1 is a 0.5"
HSS drill bit and T2 is a 0.5" tapping bit. The rest of the features are cut using a 0.75" HSS
milling tool, T3. Feed rate and spindle speed are 10 ipm and 2000 rpm. The material is low-
carbon steel. Part thickness is 0.5”. Use dotted lines two show the path of tools movements.
Set up proper operation conditions as discussed in the class today.
1. If a machinist wanted to drill a % inch hole in a piece of machine steel using a high speed steel
drill. At what speed in revolutions per minute should he operate the drill press?
2. Find the revolutions per minute of an 8 mm drill if it is used to cut an aluminum workpiece using
a high carbon steel drill.
3. The rpm setting of the drill press is set to 600 rpm. What is the maximum diameter in inches of a
high speed drill if it is used to drill a tool steel material?
4. A drill press has the following rpm settings; 350, 600, 1100, & 1600. What rpm setting must be
used if a 15 mm high speed steel drill is used to cut brass workpiece?
5.
A machine operator drills a hole of a 3/8 inch diameter to a stainless steel using a carbon steel
drill. He sets the drill press rpm setting to 900 rpm. Is he operating at correct setting? If not,
then what must be the correct rpm setting considering that the machine has the following rpm
settings of 300, 600, 900, 1200, and 1800?
Chapter 23 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 23 - How is the tool-work relationship in turning...Ch. 23 - What different kinds of surfaces can be produced...Ch. 23 - How does form turning differ from ordinary...Ch. 23 - What is the basic difference between facing and a...Ch. 23 - Which operations shown in Figure 23.3 do not form...Ch. 23 - Why is it difficult to make heavy cuts if a form...Ch. 23 - Show how equation 23.6 is an approximate equation.Ch. 23 - Why is the spindle of the lathe hollow?Ch. 23 - What function does a lathe carriage have?Ch. 23 - Why is feed specified for a boring operation...
Ch. 23 - Why are depths of cut in boring usually smaller...Ch. 23 - How can work be held and supported in a lathe?Ch. 23 - How is a workpiece that is mounted between centers...Ch. 23 - What will happen to the workpiece when turned, if...Ch. 23 - Why is it not advisable to hold hot-rolled steel...Ch. 23 - How does a steady rest differ from a follow rest?Ch. 23 - What are the advantages and disadvantages of a...Ch. 23 - Why should the distance the cutting tool overhangs...Ch. 23 - Prob. 19RQCh. 23 - How can a tapered part be turned on a lathe?Ch. 23 - Why might it be desirable to use a heavy depth of...Ch. 23 - If the rpm for a facing cut (assuming given work...Ch. 23 - Why is it usually necessary to take relatively...Ch. 23 - How does the corner radius of the tool influence...Ch. 23 - What effect does a BUE have on the diameter of the...Ch. 23 - How does the multiple-spindle screw machine differ...Ch. 23 - Why does boring ensure concentricity between the...Ch. 23 - Why are vertical spindle machines better suited...Ch. 23 - Prob. 29RQCh. 23 - Prob. 30RQCh. 23 - In which figures in this chapter is a dead center...Ch. 23 - Prob. 32RQCh. 23 - In which figures in this chapter showing setups do...Ch. 23 - How many form tools are being utilized in the...Ch. 23 - Prob. 35RQCh. 23 - Select the speed, feed, and depth of cut for...Ch. 23 - Calculate the rpm NS to run the spindle on a lathe...Ch. 23 - The lathe in problem 2 has rpm settings of 20, 30,...Ch. 23 - Calculate the cutting time if the length of cut is...Ch. 23 - Calculate the metal removal rate for machining at...Ch. 23 - Determine the speed, feed, and depth of cut when...Ch. 23 - At a speed of 90 fpm, feed of 0.030 ipr, and depth...Ch. 23 - Calculate the cutting time for a 4-in. length of...Ch. 23 - For a boring operation at V=90,fr=0.030, and...Ch. 23 - A cutting speed of 100 sfpm has been selected for...Ch. 23 - The following data apply for machining a part on a...Ch. 23 - A finish cut for a length of 10 in. on a diameter...Ch. 23 - A workpiece 10 in. in diameter is to be faced down...Ch. 23 - A hole 89 mm in diameter is to be drilled and...
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