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In a turning operation on carbon steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.25 mm/rev, and depth of cut = 7 mm. How much power will the lathe draw in performing

In a turning operation on carbon steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.25 mm/rev, and depth of cut = 7 mm. How much power will the lathe draw in performing

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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In a turning operation on carbon steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.25 mm/rev, and depth of cut = 7 mm. How much power will the lathe draw in performing
Transcribed Image Text:In a turning operation on carbon steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.25 mm/rev, and depth of cut = 7 mm. How much power will the lathe draw in performing
this operation if its mechanical efficiency = 96%. Use Table below to obtain the appropriate specific energy value. TABLE 21.2 Values of unit horsepower and specific energy for selected work materials using sharp cutting tools and chip thickness before the cut t, = 0.25 mm (0.010 in). Specific Energy U or Unit Power P, Brinell N-m/mm in-lb/in Unit Horsepower HP, hp/(in³/min) Material Hardness 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 2.2 320,000 320,000 60,000 0.8 Bronze 100–150 2.2 0.8 Magnesium alloys 50–100 0.4 0.15 Activete
Transcribed Image Text:this operation if its mechanical efficiency = 96%. Use Table below to obtain the appropriate specific energy value. TABLE 21.2 Values of unit horsepower and specific energy for selected work materials using sharp cutting tools and chip thickness before the cut t, = 0.25 mm (0.010 in). Specific Energy U or Unit Power P, Brinell N-m/mm in-lb/in Unit Horsepower HP, hp/(in³/min) Material Hardness 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 2.2 320,000 320,000 60,000 0.8 Bronze 100–150 2.2 0.8 Magnesium alloys 50–100 0.4 0.15 Activete
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