Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 25, Problem 7P
Assume that you are drilling eight holes, equally spaced in a bolt-hole circle. That is, there would be holes at 1,2, 3, 6, and 9 0'clock and four more holes equally spaced between them. The diameter of the bolt-hole circle is 6 in. The designer says that the holes must be 45 degrees ±1 degree from each other around the circle.
- Compute the tolerance between hole centers.
- Do you think a typical multiple-spindle drill setup could be used to make this bolt circle-using eight drills all at once? Why or why not?
- Do you think that the use of a jig may help improve the situation?
- Do you think a CNC drilling process could do the holes best?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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?
Please solve it correctly , Don't Use Ai tool.
(1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.
What is the cutting speed of turning in the unit of m/min, when main axis spindle speed is 2,409 rpm and external diameter is 86mm ?
Answer in 2 decimal points.
Calculate the theoretical spindle rotational speed in rpm required to drill a 1 mm hole in copper using high speed steel drill. The recommende
cutting speed is as following. The thickness of the copper plate is 24. (Leave the answer in numerical value, no need to key in 'rpm')
Typical cutting speeds (m/min)
High speed steel
Material
Tungsten carbide
Aluminum
100
500
60
330
Copper
Hard brass
45
230
Bronze
35
180
Mild steel
28
250
Cast iron
20
160
Chapter 25 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 25 - What functions are performed by the flutes on a...Ch. 25 - What determines the rake angle of a drill? See...Ch. 25 - Basically, what determines what helix angle a...Ch. 25 - When a large-diameter hole is to be drilled, why...Ch. 25 - Equation 25.4 for the MRR for drilling can be...Ch. 25 - Are the recommended surface speeds for spade...Ch. 25 - What can happen when an improperly ground drill is...Ch. 25 - Why are many drilled holes oversize with respect...Ch. 25 - What are the two primary functions of a...Ch. 25 - What is the function of the margins on a twist...
Ch. 25 - What factors tend to cause a drill to drift off...Ch. 25 - The drill shown in Figure 25.13 has coolant...Ch. 25 - Prob. 13RQCh. 25 - Why do cutting fluids for drilling usually have...Ch. 25 - How does a gang-drilling machine differ from a...Ch. 25 - Prob. 16RQCh. 25 - How does the thrust force vary with feed? Why?Ch. 25 - Holding the workpiece by hand when drilling is not...Ch. 25 - Prob. 19RQCh. 25 - In terms of thrust, what is unusual about the...Ch. 25 - Prob. 21RQCh. 25 - Prob. 22RQCh. 25 - What are the primary purposes of reaming?Ch. 25 - What are the advantages of shell reamers?Ch. 25 - A drill that operated satisfactorily for drilling...Ch. 25 - What precautionary procedures should be used when...Ch. 25 - What is the advantage of a spade drill? Is it...Ch. 25 - Prob. 28RQCh. 25 - Why does drill feed increase with drill size?Ch. 25 - Suppose you specified a drilling feed rate that...Ch. 25 - Suppose you wanted to drill a 1.5-in.-diameter...Ch. 25 - How much time will be required to drill the hole...Ch. 25 - What is the metal removal rate when a...Ch. 25 - If the specific horsepower for the steel in...Ch. 25 - If the specific power of an AISI 1020 steel of...Ch. 25 - Prob. 6PCh. 25 - Assume that you are drilling eight holes, equally...Ch. 25 - What machining difficulties should this process...Ch. 25 - Why were the distances between the holes too...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
In each case, express the shear and moment functions In terms of x, and then draw the shear and moment diagrams...
Mechanics of Materials
A school classroom is designed for 30 people. (a) What is the minimum amount of clean outdoor air required? (b)...
Heating Ventilating and Air Conditioning: Analysis and Design
Determine the reactions at the supports. Prob. 5-15
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
Determine the normal stress in each member of the truss structure. All joints are ball joint, and the material ...
Introduction To Finite Element Analysis And Design
What parts are included in the vehicle chassis?
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Comprehension Check 8-3
The mass of the human brain is 1360 grams [g]. State the weight of the human brain in u...
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- The part in Figure 1 is to be drilled on a turret-type drill press. The part is 15.0 mm thick. Threedrill sizes will be used: 8 mm, 10 mm, and 12 mm, which are to be specified in the part programby tool turret positions TO1, T02, and T03. All tooling is high speed steel. Cutting speed = 75mm/min and feed = 0.08 mm/rev. Use the lower-left corner of the part as the origin in the x-y axissystem. Write the part program in the word address format using absolute positioning.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_forwardHandwritten solution recommended. (1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.arrow_forward
- 4. The drilling speed for cast iron is assumed to be 70 ft/min. Find the time required to drill two holes in each of 500 castings if each hole has a diameter of 3/4" and is 1" deep. Use .010" feed and allow 14 minute per hole for setup. Page #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 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.arrow_forward
- Suppose you need to drill a 5/8 inch hole, but the set of drill bits is measured in sixteenths of an inch. What size drill bit should you use?arrow_forwardIf the limits of size for a hole are .384 and .394 diameter with positon tolerance .009 at MMC, what is the allowable position tolerance produced at .386?arrow_forwardIt takes only 12 seconds to mill 0.5" x 5.5" keyway by means of a 40-tooth cutter at a feed rate of 0.249 mm/tooth. Compute the required speed of the cutter in rpm. 70 O65 O 60 75 Aarrow_forward
- The outline of the part in figure below is to be profile milled, using a 20 mm diameter end mill with two teeth. The part is 10 mm thick. Cutting speed =125 m/min and feed = 0.10 mm/rev. Use the lower left comer of the part as the origin in the x-y axis system. The two holes in the part have already been drilled and will be used for clamping the part during milling, Write the part program in the APT format.arrow_forward24 The special hollow drill bits are used in core drilling. Select one: True Falsearrow_forwardA high-speed heavy duty plain milling cutter 4 inches in diameter with 12 teeth is to be used. Each tooth s expected to remove 0.006 inch. What is the feed per revolution? 2. The feed per revolution is 0.0072 inch/rev and the machine is set for 120 rev/min. Find the feed in inch per minutearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
HOME SHOP JIGS & FIXTURES PART 1, TYPES OF JIGS & ACCESSORIES AND THE THEORIE BEHIND THE TOOLS; Author: THATLAZYMACHINIST;https://www.youtube.com/watch?v=EXYqi42JimI;License: Standard Youtube License