29- In a turning operation on brass with hardness 125 HB, the cutting speed = 200 m/min, teed = 0.25 mm/rev, and depth of cut -7.5 mm. How much power will the lathe draw in performing this operation if its mechanical efficiency 90%. Use the table given below to obtain the appropriate specific energy value. Specific Energy U or Unit Power Pu Brinell Unit Horsepower HP, hp/(in '/min) Material Hardness N-m/mm in-lb/in Carbon steel 150-200 1.6 240,000 0.6 201-250 2.2 320,000 0.8 251-300 2.8 400,000 1.0 Alloy steels 200-250 2.2 320,000 0.8 251-300 2.8 400,000 1.0 301-350 3.6 520,000 1.3 351-400 4.4 640,000 1.6 Cast irons 125-175 1.1 160,000 0.4 175-250 1.6 240,000 400,000 0.6 Stainless steel 150-250 2.8 1.0 Aluminum 50-100 0.7 100,000 0.25 Aluminum alloys 100-150 0.8 120,000 0.3 Brass 100-150 2.2 320.000 0.8 Bronze 100-150 2.2 320,000 0.8 Magnesium alloys 50-100 0.4 60,000 0.15 a) 21,007 b) 38.194 C) 10.503 d) 16,667

29- In a turning operation on brass with hardness 125 HB, the cutting speed = 200 m/min, teed = 0.25 mm/rev, and depth of cut -7.5 mm. How much power will the lathe draw in performing this operation if its mechanical efficiency 90%. Use the table given below to obtain the appropriate specific energy value. Specific Energy U or Unit Power Pu Brinell Unit Horsepower HP, hp/(in '/min) Material Hardness N-m/mm in-lb/in Carbon steel 150-200 1.6 240,000 0.6 201-250 2.2 320,000 0.8 251-300 2.8 400,000 1.0 Alloy steels 200-250 2.2 320,000 0.8 251-300 2.8 400,000 1.0 301-350 3.6 520,000 1.3 351-400 4.4 640,000 1.6 Cast irons 125-175 1.1 160,000 0.4 175-250 1.6 240,000 400,000 0.6 Stainless steel 150-250 2.8 1.0 Aluminum 50-100 0.7 100,000 0.25 Aluminum alloys 100-150 0.8 120,000 0.3 Brass 100-150 2.2 320.000 0.8 Bronze 100-150 2.2 320,000 0.8 Magnesium alloys 50-100 0.4 60,000 0.15 a) 21,007 b) 38.194 C) 10.503 d) 16,667

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.

Question

29- In a turning operation on brass with hardness = 125 HB, the cutting speed = 200 m/min, teed = 0.25 mm/rev, and
depth of cut =7.5 mm. How much power will the lathe draw in performing this operation if its mechanical efficiency
90%. Use the table given below to obtain the appropriate specific energy value.
Specific Energy U or
Unit Power Pu
Brinell
Unit Horsepower
HP, hp/(in'/min)
Material
Hardness
N-m/mm
in-lb/in
Carbon steel
150-200
1.6
240,000
0.6
201-250
2.2
320,000
0.8
251-300
2.8
400,000
1.0
Alloy steels
200-250
2.2
320,000
0.8
251-300
2.8
400,000
1.0
301-350
3.6
520,000
1.3
351-400
4.4
640,000
1.6
Cast irons
125-175
1.1
160,000
0.4
175-250
1.6
240,000
0.6
Stainless steel
150-250
2.8
400,000
1.0
Aluminum
50-100
0.7
100,000
0.25
Aluminum alloys
100-150
0.8
120,000
0.3
Brass
100-150
2.2
320,000
0.8
Bronze
100-150
2.2
320,000
0.8
Magnesium alloys
50-100
0.4
60,000
0.15
a)
21,007
b)
38.194
10.503
d)
16.667
3332

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