Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Textbook Question
Chapter 27, Problem 19RQ
For a given job, how would a broach having rotor-tooth design compare in length with one having regular, full-width teeth?
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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.
Is a #6 twist drill larger than a #16 twist drill?
What is the diameter of both twisting screws?
a. 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 - 150
Chapter 27 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 27 - Why is sawing one of the most efficient of the...Ch. 27 - Explain why tooth spacing (pitch) is important in...Ch. 27 - What is the tooth gullet used for on a saw blade?Ch. 27 - Explain what is meant by the set of the teeth on a...Ch. 27 - How is tooth set related to saw kerf?Ch. 27 - Why can a bandsaw blade not be hardened throughout...Ch. 27 - What are the advantages of using circular saws?Ch. 27 - Why have bandsawing machines largely replaced...Ch. 27 - Explain how the hole in Figure 27.7 is made on a...Ch. 27 - How would you calculate or estimate Tm for a...
Ch. 27 - What is the disadvantage of using gravity to feed...Ch. 27 - What is unique about the broaching process...Ch. 27 - Can a thick saw blade be used as a broach? Why or...Ch. 27 - Broaching machines are simpler in a basic design...Ch. 27 - Why is broaching particularly well-suited for mass...Ch. 27 - In designing a broach, what would be the first...Ch. 27 - Why is it necessary to relate the design of a...Ch. 27 - What two methods can be utilized to reduce the...Ch. 27 - For a given job, how would a broach having...Ch. 27 - Why are the pitch and radius of the gullet between...Ch. 27 - Why are broaching speeds usually relatively low,...Ch. 27 - What are the advantages of shell-type broach...Ch. 27 - Why are most broaches made from alloy or...Ch. 27 - What are the advantages of TiN-coated broaching...Ch. 27 - For mass-production operations, which process is...Ch. 27 - What is the difference between the roughing teeth...Ch. 27 - The sides of a square, blind hole must be machined...Ch. 27 - The interior, flat surfaces of socket wrenches,...Ch. 27 - Prob. 29RQCh. 27 - What are some ways to improve the efficiency of a...Ch. 27 - To what extent is filing different from sawing?Ch. 27 - Prob. 32RQCh. 27 - Prob. 33RQCh. 27 - Prob. 34RQCh. 27 - A surface 12 in. long is to be machined with a...Ch. 27 - The pitch of the teeth on a simple surface broach...Ch. 27 - Estimate the (approximate maximum) horsepower...Ch. 27 - Estimate the approximate force acting in the...Ch. 27 - In cutting a 6-in.-long slot in a piece of AISI...Ch. 27 - The strength of a pull broach is determined by its...Ch. 27 - Suppose you want to shape a block of metal 7 in....Ch. 27 - Could you have saved any time in Problem 7 by...Ch. 27 - Derive the equation for shaping cutting speed.Ch. 27 - How many strokes per minute would be required to...Ch. 27 - How much time would be required to shape a flat...Ch. 27 - What is the metal removal rate in Problem 11 if...Ch. 27 - Suppose you decide to mill the flat surface...Ch. 27 - A planer has a 10-hp motor, and 75% of the motor...
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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
- A 0.4-inch diameter bit is used in a vertical or vertical drill that operates at 300 rpm. If the feed is 0.005 in / rev, what is the MRR? What is the MRR if the drill diameter is doubled? What is the power required in the drill if the material is an annealed AISI 1080?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_forwardBriefly describe a gang drill press and its benefit.arrow_forward
- The outline of the part in the Figure below is to be profile milled using a 20- mm diameter end mill with two teeth. The part is 10 mm thick. The cutting speed = 125 m/min and feed = 0.10 mm/tooth. The part is also to be drilled with a drill size of 10 mm corresponds to T01 with a cutting speed =75 mm/min and feed = 0.08 mm/rev. The two holes pass completely through the part. 30 rad. 125.75 10 dia., 2 holes Write the part program (G & M code program) for the required machining processes. Use absolute programming with the lower left 25 corner of the part as the origin in the x-y axis system. 150 (All dimensions are in mm.) 25 50 75 35 deg.arrow_forwardThe disadvantage of a universal chuck is that not possible to hold eccentric workpieces. Select one: True Falsearrow_forwardb. A drilling operation is to be performed with a 13 mm diameter HSS twist drill on a mild steel workpiece that has an overall thickness of 80mm. The hole is to be drilled to a depth of 65 mm. The recommended cutting speed is 0.42 m/s and the feed is 0.30 mm/rev. i) What is the typical point angle of such a drill? ii) Determine the cutting time to complete the drilling operation.arrow_forward
- The surface finish specification in a turning job is 0.90 um. The work material is cast iron. The cutting conditions have been selected as follows: v =90 m/min, f -0.23 mm/rev, and d = 2.2 mm. The nose radius of the cutting tool must be selected. Determine the minimum nose radius that will obtain the specified finish in this operation. oichie 0 90. m The wok matedal i material isarrow_forwardIn the manufacture of twist drills, the shank is joined to the body of the drill using (a) spot welding (b) TIG welding (c) projection welding (d) friction weldingarrow_forwardIt is a hardened steel device with a taper shank on one end and a 60 point at the other end (a) Live tailstock center (b)Lathe center (c)Tool post (d)Spindle sleevearrow_forward
- When turning the relative speed of the work piece rotation and feed rates of the cutting tool coupled to the material to be cut must be calculated. The turning machine is designed to run at 8 different speeds via a serious of gears. The speed must be correct to ensure tool longevity, material finish and minimum time of manufacture. The cutting speed is given by the following equation Where: N = spindle speed (rpm) CS = Cutting Speed of Metal (m/min) d= Diameter of Workpiece (mm) Different metals have different CS recommendations. For this question you are considering brass which has a recommended CS of 60. The pieces to be machined range in size from 20mm to 55mm. You have been asked to determine the 8 spindle speeds given a CS value for brass for the different diameters. These speeds are to be arranged in arithmetic progression 2. geometric progressionarrow_forwardThe advantage of an independent chuck is that the work can be centred to high precision. Select one: True Falsearrow_forwardq4arrow_forward
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