Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 3.4, Problem 4RQ
Cutting action on the power hacksaw is very similar to the _________________ ______________.
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In the classification of manufacturing process, threading is an example of __________________________________.
A- secondary machining process
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C- surface finishing process
D- primary shaping process
Question 19
Which of the following machine tools is the most suitable one for machining of relatively large batches with several operations?
Answers:
a. Toolroom lathe
b. Turret lathe
c. Vertical turret lathe
d. Engine lathe
e. Speed lathe
Consider the following statements on milling machines
1.
2.
Facing cutters have a tapered or straight shanks
End mills usually are bolted at the end of a stub arbor
3
Plain milling cutters are used for profilling as well
Answers:
a. Only 2 and 3 are correct
b.
Only 1 and 2 are correct
c. Only 1 and 3 are conect
d. None of them is correct
e Only 1 is correct
Question 21
Find the incorrect statement about center type cylindrical grinding. (If you cannot find an incorrect statement among items a, b, c and d then code "e" for this question)
Answers: & Workpiece rotates
b. Grinding wheel rotates
Usually workpiece traverses
d, Depth of cut is usually determined by infeed of the grinding wheel
e. All are correct
Consider the following statements about…
Chapter 3 Solutions
Precision Machining Technology
Ch. 3.1 - Information such as tolerances and scale can be...Ch. 3.1 - What view of a drawing usually shows the most...Ch. 3.1 - Prob. 3RQCh. 3.1 - The line type used to show edges of an object that...Ch. 3.1 - What line type is used to show edges of an object...Ch. 3.1 - What two line types work together to show sizes on...Ch. 3.1 - Identify the line types labeled in the print...Ch. 3.1 - Define and briefly describe the following...Ch. 3.1 - A dimension listed on an engineering drawing is...Ch. 3.1 - List and briefly describe the three types of...
Ch. 3.1 - Briefly describe the difference between a...Ch. 3.1 - The relationship between sizes of mating parts is...Ch. 3.1 - What does GDT stand for?Ch. 3.1 - A plane used as a reference for dimensions is...Ch. 3.1 - A GDT symbol and the amount of tolerance are shown...Ch. 3.1 - What are the five categories of symbols used in...Ch. 3.1 - What is a feature of size?Ch. 3.1 - Briefly explain the benefit of a position...Ch. 3.2 - Prob. 1RQCh. 3.2 - What is the purpose of layout fluid (dye)?Ch. 3.2 - Prob. 3RQCh. 3.2 - Briefly define a scriber and its use.Ch. 3.2 - What two angles can be laid out with the...Ch. 3.2 - What two tasks can a divider be used to perform?Ch. 3.2 - What safety precautions should be observed when...Ch. 3.2 - What would the divider setting be to scribe a...Ch. 3.2 - What would the divider setting be to scribe an arc...Ch. 3.2 - Prob. 10RQCh. 3.2 - Prob. 11RQCh. 3.2 - Briefly describe the use of a surface gage.Ch. 3.3 - What are three safety rules to observe when using...Ch. 3.3 - List three types of screwdriver tips.Ch. 3.3 - What is the advantage of using slip joint pliers?Ch. 3.3 - What is an advantage of using locking pliers?Ch. 3.3 - What are two uses for a ball peen hammer?Ch. 3.3 - What is the advantage of a soft face hammer?Ch. 3.3 - In what situation would a box-end wrench be chosen...Ch. 3.3 - List two precautions to observe when using...Ch. 3.3 - What is one method of preventing damage to work...Ch. 3.3 - List three safety precautions to be observed when...Ch. 3.3 - In which direction should hacksaw blade teeth...Ch. 3.3 - List two safety precautions that should be...Ch. 3.3 - Will a single-cut or a double-cut file remove...Ch. 3.3 - Will a single-cut or a double-cut file produce a...Ch. 3.3 - ___________ and _________ are two common filing...Ch. 3.3 - What tool is used to clean a file?Ch. 3.3 - What are the two forms of abrasives used in...Ch. 3.4 - Sawing machines can be divided into roughly four...Ch. 3.4 - The vertical band saw is particularly useful, as...Ch. 3.4 - The horizontal band saw is ideal for cutting...Ch. 3.4 - Cutting action on the power hacksaw is very...Ch. 3.4 - List three safety precautions to observe when...Ch. 3.4 - Briefly describe the process to prepare for...Ch. 3.4 - List three safety precautions to observe when...Ch. 3.4 - What type of band saw blade has HSS teeth welded...Ch. 3.4 - How many saw teeth should be engaged in the...Ch. 3.4 - Name the three different types of tooth patterns.Ch. 3.4 - What are the three types of tooth set and why is...Ch. 3.4 - The slot created in a workpiece by the saw blade...Ch. 3.4 - Explain how to use a push stick.Ch. 3.4 - Saws should be ____________ _____________ when a...Ch. 3.4 - Saw guides should be mounted ________ above the...Ch. 3.4 - Why must a band saw blade be annealed after...Ch. 3.4 - Why does a band saw blade need to be ground after...Ch. 3.4 - Clearance between the vertical band saw guides and...Ch. 3.4 - Band saw cutting speeds are given in _________.Ch. 3.5 - What is the main benefit of offhand abrasive...Ch. 3.5 - What type of metals should not be ground on a...Ch. 3.5 - Which wheel is finer, a 60 grit or a 36 grit?Ch. 3.5 - If a grinder runs at 3400 RPM and you have a wheel...Ch. 3.5 - How is a ring test performed?Ch. 3.5 - Why is it necessary to have blotters on both sides...Ch. 3.5 - The maximum distance that a spark breaker and tool...Ch. 3.5 - When should a grinding wheel be dressed?Ch. 3.5 - Where should you stand when using a grinder?Ch. 3.6 - Define drilling.Ch. 3.6 - What factors might determine when a hole must be...Ch. 3.6 - Prob. 3RQCh. 3.6 - Explain the purpose of a counterbore.Ch. 3.6 - What is the purpose of the pilot on a counterbore?Ch. 3.6 - What should be done as a drill nears the...Ch. 3.6 - Define thread as it relates to benchwork.Ch. 3.6 - Explain the major diameter of a thread.Ch. 3.6 - What is the TPI of a -20 thread?Ch. 3.6 - Name two types of tap wrenches.Ch. 3.6 - A 3/8-16 threaded hole needs to be tapped deeper....
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- 5 Clapper box is used for _______ during machining. a. Push the tool down during return stroke b. Lift the tool during return stroke c. Lift the tool during cutting stroke d. Push the tool down during cutting strokearrow_forwardWrite TRUE is the statement/s is True. If the statement is false, identify the word/s that makes the sentence incorrect and write its corresponding correct answer. 1. High cutting temperature is undesirable because it reduces tool life, produces hot chips and can cause inaccuracies in tool dimension due to thermal expansion. 2. Cubic boron nitride does chemically react with iron and nickel. 3. Nose wear is usually caused by rubbing of the tool along the machined surface of the workpiece.arrow_forwarda. If rough milling of mild steel is performed using High Speed Steel (HSS) side and face milling cutter of 100 mm diameter, what rpm should be used. b. If finish turning of a shaft is done to reduce its diameter from 24 mm to 20 mm using carbide tool, what rpm should be used. Metric Surface Speeds in m/min (Cutting Speed) Tool Material Aluminum Drilling Carbide 90 - 115 Milling - Rough Carbide Milling - Finish Carbide 120 - 240 Turning Carbide Rough Carbide Finish HSS HSS HSS 55 - 60 120 - 240 150 - 270 75 - 105 60 - 90 60 - 90 135 - 180 Brass 40 - 45 75 - 100 45 - 60 60 - 75 90 - 210 105 - 210 135 - 260 35 - 45 55 - 75 60 - 90 75 - 105 60 - 100 Cast Iron 12 - 18 15 - 25 25 - 30 60 - 90 75 - 135 Mild Steel 10 - 15 75 - 105 75 - 120 18 - 27 18 -3- 45 - 60 23 - 40 100 - 145 Stainless Steel 8 - 18 25 - 37 10 - 15 55 - 67 12 - 25 85 - 150arrow_forward
- Standard time & work sampling The following data resulted from a time study made on a horizontal milling machine: Mean manual effort time per cycle: 4.62 min Mean cutting time (power feed): 3.74 min Mean performance rating: 115 percent Machine allowance (power feed): 10 percent Fatigue allowance: 15 percent questions: 1.) What is the Basic Time for the manual effort? 2.) What is the Standard Time for the manual effort? 3.) What is the Standard Time for the machine?arrow_forwardGenerally, to decrease or eliminate built-up edge, _______________________________________. Group of answer choices the cutting speed needs to be decreased tip radius of the tool need to be increased depth of cutting needs to be increased rake angle needs to be increased PreviousNextarrow_forward_1. What is a type of tool that used to loosen or tighten screws that have a star-like depression on the top, a feature that is mainly found on a laptop? a. Multimeter b. Philip Head Screwdriver c. Torx screwdriver 2. What is the type of tool used to tighten and loosen slotted screws? a. Flat-head screw driver b. Needle Nose Pliers c. Tweezers _3. What is the type of tools used in used to prevent ESD damage to computer equipment? a. Anti-static Mat b. Anti-static wrist strap c. Lint-free cloth 4. Type of tool used to hold screw, jumpers, fasteners and organized small parts and prevents them from getting mixed. a. Multimeter b. Part retriever c. Parts organizer _5. What is the type of tool that can light up areas which you cannot see? b. Flashlight c. Multimeter a. Cable tiesarrow_forward
- Write TRUE is the statement/s is True. If the statement is false, identify the word/s that makes the sentence incorrect and write its corresponding correct answer. 16. since the thickness of chips is always greater than the depth of cut, chip compression ratio is àways less than 1.0. 17. Inserts have multiple cutting points. 18. Free Machining steels are non-ferrous metals which contain sulfur and phosphorus.arrow_forwardChip guard installed between operator and point of operation must be in a specified range is safety precaution for __________________machine. a. Lathe b. Drilling c. Milling machine d. Grindingarrow_forwardBased on the CNC program below, identify 1)what machine it is (lathe/mill) ? 2)is the coolant used? 3)Any pocket/holes drilling? and if yes how many? 4)How many tool(s) is/are used? N1 G90 G17 G40 G80 G00 N108 M06 T1 (1/4) N110 (F-contour) N112 G00 G54 G90 X0.8937 Y-2.0181 S6000 M03 N114 G43 H1 Z5. N116 Z1. N118 Z0.1 N120 G01 Z0. F30. N122 G03 X0.9302 Y-2.262 Z-0.0007 I0.2488 J-0.0875 F60. N124 G02 X0.9927 Y-2.4845 Z-0.0012 I-0.2631 J-0.1939 N126 G03 X0.9927 Y-2.7716 Z-0.002 I1.6354 J-0.1436 N128 G02 X0.9302 Y-2.9941 Z-0.0026 I-0.3256 J-0.0286 N130 G03 X0.8937 Y-3.2381 Z-0.0032 I0.2123 J-0.1565 N132 X2.0181 Y-4.3624 Z-0.0074 I1.7344 J0.61 N134 X2.262 Y-4.3259 Z-0.008 I0.0875 J0.2488 N136 G02 X2.4845 Y-4.2634 Z-0.0086 I0.1939 J-0.2631 N138 G03 X2.7716 Y-4.2634 Z-0.0094 I0.1436 J1.6354 N140 G02 X2.9941 Y-4.3259 Z-0.01 I0.0286 J-0.3256 N142 G03 X3.2381 Y-4.3624 Z-0.0106 I0.1565 J0.2123 N144 X4.3624 Y-3.2381 Z-0.0148 I-0.61 J1.7344 N146 X4.3259 Y-2.9941 Z-0.0154 I-0.2488…arrow_forward
- 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…arrow_forwardTRUE OR FALSE. IF FALSE WHAT WORD MAKES THE STATEMENT INCORRECT AND WHAT IS THE CORRESPONDING CORRECT ANSWER. In Machining the chip dissipates most of the energy. Thus, it has the lowest temperature relative to the workpiece and tool.arrow_forwardAnswer the following questions by circling True or False. 5. Tool layouts can be converted into a cam profile that is used for the control of the tool. .... () 6. Higher the rake angle, less the cutting forces. 7. A very large clearance angle increases the strength of the tool tip. 8. The continuous chip causes poor surface finish and low tool life. 9. Ceramics are the hardest tool materials in the world. 10. The smaller the cutting ratio, the larger the cutting deformation. 11. A shaper can be used for maching flat surfaces in horizontal and angular directions. 12. During the return stroke of the shaper, the cutting tool will simply be sliding... 13. The cutting speed of the hydraulic shaper changes throughout most of the cutting stroke. 14. Arbour-mounted cutters are used in vertical axis machines to generate flat surfaces... 15. Dividing head is an important attachment that is used to divide the periphery of the workpiece into a number of divisions to machine surfaces.. () () ()arrow_forward
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