A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
A. 0.2 mm
B. 10 mm
C. 20 mm
D. 100 mm
Answer: Option C
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A. Reduces tool life
B. Increases tool life
C. Have no effect on tool life
D. Spoils the work piece
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B. Left hand spiral fluted reamer
C. Right hand spiral fluted reamer
D. Any one of these
High speed steel tools retain their hardness up to a temperature of
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B. 350°C
C. 500°C
D. 900°C
(20+20)/2 = 20mm
Here it is (D+t) /2.