Precision Machining Technology
3rd Edition
ISBN: 9781337795302
Author: Peter, Hoffman.
Publisher: Cengage Learning,
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Textbook Question
Chapter 7.3, Problem 8RQ
Depth-of-cut range for surface grinding is:
- a. 0.010"–0.100"
- b. 0.0001"–0.0002"
- c. 0.0001"–0.003"
- d. 0.00001"–0.00005"
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1/
Belt grinding is an example of primary shaping process.
Select one:
True
False
8. A note in the comment section of a title block mentions that all faces should have
a +.10 tolerance before heat treatment. The machinist follows the instructions but for
diameters he leaves a tolerance of +.20. Why?
O A. The machinist may have committed an error, and the part must be returned prior to
heat treatment.
OB. Diameter dimensions usually change by twice as much as the faces.
OC. The tolerances for diameters aren't as critical as face tolerances.
D. It's easier for the machinist to adopt MMC for diameters.
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.
Chapter 7 Solutions
Precision Machining Technology
Ch. 7.1 - What are three benefits of precision grinding?Ch. 7.1 - What is the major use of the surface grinder?Ch. 7.1 - What are the two spindle types used for surface...Ch. 7.1 - What are the two types of table movements used for...Ch. 7.1 - Label the parts of the surface grinder.Ch. 7.1 - What are three types of cylindrical grinders?Ch. 7.1 - Tool and cutter grinders can be used to _______...Ch. 7.2 - What wheel shapes are commonly used for surface...Ch. 7.2 - What abrasive is commonly used to grind steels?Ch. 7.2 - What abrasive is used to grind nonferrous metals,...
Ch. 7.2 - What does CBN stand for?Ch. 7.2 - What superabrasive is a good choice for grinding...Ch. 7.2 - The grade of a wheel describes its __________ on a...Ch. 7.2 - Prob. 7RQCh. 7.2 - Prob. 8RQCh. 7.2 - Generally, harder wheels should be used to grind...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V What is the...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V Which wheel...Ch. 7.2 - Wheel A: 32A60H8V Wheel B: 39C100L6V What type of...Ch. 7.3 - List five surface grinder safety guidelines.Ch. 7.3 - What should be done to every grinding wheel before...Ch. 7.3 - When using a magnetic workholding device, the work...Ch. 7.3 - When using a magnetic chuck to hold a workpiece...Ch. 7.3 - Describe the difference between wheel truing and...Ch. 7.3 - What tool is used to true and dress an aluminum...Ch. 7.3 - How is a CBN wheel trued and dressed?Ch. 7.3 - Depth-of-cut range for surface grinding is: a....Ch. 7.3 - What should be done to a magnetic chuck when it...Ch. 7.3 - What workholding device can extend the magnetic...Ch. 7.3 - What workholding device can be used when grinding...Ch. 7.3 - Briefly describe the method for grinding two...Ch. 7.3 - List three types of workpiece features that can be...Ch. 7.3 - List three possible solutions to eliminate bum...Ch. 7.3 - What can cause scratches on the surface of a...
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- Abrasive machining makes use of ______ to remove material.arrow_forwardQUESTION 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_forwardA note States leave in minimum of .005" on all surfaces to allow for grinding after heat treat what should the size of a 2.000" diameter shaft be prior to heat treating?arrow_forward
- -How many holes require drilling? -What is the center to center distance of the 6mm tapped holes? -What tap drill is used for holes marked Z? -How many surfaces are machine finished? -What are the dimensions of the face marked F & C? -What are the dimensions have symbols A, E &, B -In what dihedral angle is the drawing made? -What is the max and min dimensions of D -What is the tolerance of measurement D?arrow_forwardWrite a control of vertical spindle surface grinding from a multi-axis computer numerical control machine.arrow_forwardWhat is a control of vertical spindle surface grinding from a multi-axis computer numerical control machine?arrow_forward
- Multiple grooving is most suited for: 4 1 2 3 O Rough grooving when the depth is bigger than the width O Minimizing vibrations and radial forces Machining steel and stainless steel and when the width of the groove is larger than the deptharrow_forwardWhat can happen if a grinding stone with a lower-rated RPM than the grinder is used?arrow_forwardWhich of the following are the grinding types? 32 - Aşağıdakilerden hangisi taşlama çeşitlerindendir? Face A) Alın Peripherial B) Satıh All Hepsi Face D) Dik Peripherial E) Düzlemselarrow_forward
- in a cylindrical grinding of a long shaft, the work piece is often supported by the?arrow_forwardYou are designing a bench grinder with an operating speed of 3600 rpm. a) If you want the grinder to get to be able to reach its full operating speed in 4 seconds, what must the rate of angular acceleration be in radians per second squared? b) If the grinding wheel has a diameter of 8 inches, what will the speed of the surface of the wheel be? SKILarrow_forward3. Calculate the following indexing requirements using Brown and Sharpe milling machines: (1) 27 divisions (2) 76 divisions (3)10° 20' The index plates available with the Brown and Sharpe milling machines are: Plate – I is having 15, 16, 17, 18, 19, 20 holes. Plate – II is having 21, 23, 27, 29, 31, 33 holes. Plate – III is having 37, 39, 41, 43, 47, 49 holes. -arrow_forward
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