In a turning operation on carbon steel with hardness- 175 HB. the cutting speed - 225 m/min, feed- 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.

Elements Of Electromagnetics
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In a turning operation on carbon steel with hardness = 175 HB, the cutting speed = 225 m/min, feed = 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 P.
Unit Horsepower
HP, hp/(in'/min)
Brinell
Material
N-m/mm
in-lb/in
Hardness
0.6
0.8
Carbon steel
150-200
1.6
240,000
201-250
2.2
320,000
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
0.3
Aluminum alloys
Brass
100–150
0.8
120,000
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
29,167
26,736
19,444
18,333
22,917
12,500
Transcribed Image Text:In a turning operation on carbon steel with hardness = 175 HB, the cutting speed = 225 m/min, feed = 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 P. Unit Horsepower HP, hp/(in'/min) Brinell Material N-m/mm in-lb/in Hardness 0.6 0.8 Carbon steel 150-200 1.6 240,000 201-250 2.2 320,000 251-300 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 0.3 Aluminum alloys Brass 100–150 0.8 120,000 100–150 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 29,167 26,736 19,444 18,333 22,917 12,500
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