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 25, Problem 26RQ
What precautionary procedures should be used when drilling a deep, vertical hole in mild steel when using an ordinary twist drill?
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Students have asked these similar questions
The cutting speed of a drill depends upon the
A•material of drill
B•type of material to be drilled C•quality of surface finish desired
D•all of these
Which type of feature doesn't belong to form tolerances?
Circularity
The profile of a surface
Flatness
Cilindricity
Which option about chief elements in metal cutting is wrong?
Feed s is the tool distance moved along the axis per revolution of the work
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 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...
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- List five drill press safety guidelines.arrow_forwardList all the failure modes, wear mechanisms and wear conditions for cutting toolsarrow_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
- Identify the drilling operation in which the flat bottom drill bit is used to enlarge the existing hole. Core drilling operation Counter boring operation Counter sinking operation Gun drillingarrow_forwardWith a neat sketch explain the drill bit nomenclature?arrow_forward11. With aid of neat sketches, explain the drilling parameters. 12. With aid of neat sketch, explain the main parts of the twist drill cutting tool. 13. With aid of neat sketch, explain the point angle of the twist drill. 14. With aid of neat sketch, explain what is the difference between the counter boring and counter sinking. 15. Define “NC" and "CNC" Terms.arrow_forward
- The straight grades of cemented carbide cutting tool materials contain O Tungsten carbide and cobalt Tungsten carbide only Tungsten carbide and titanium carbide Tungsten carbide and coal carbidearrow_forwardMain characteristic when cutting Stainless Steel ISO M is: a/ Machining creates high cutting forces, built-up edge, heat and deformation hardening b/ Short-chipping material c/ Stainless steel is sticky and needs sharp cutting edgesarrow_forward___________ occurs mainly on the rake face of cutting tool. Group of answer choices Flank wear Crater wear Nose radius wear Notch weararrow_forward
- 2. Select the drill-collar size and length for the following drilling conditions: Hole size=9 in, Casing size 7 in. with 8 in. OD coupling, drill collar ID=2½ in, WOB=38,000 lbf, Mud SG-1.2 (water-1.0, steel=7.85), Hole inclination=15°, Design factor=1.2arrow_forwardWhat is the typical C content of the following mild steel tools? Nails/Spykers = ____________________ % to ________________ % Carrow_forwardGive the dimensions of the reamed holes??arrow_forward
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