Question

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 1

Its ans is ....
(b). 10mm

Answer 2

Answer:

20 mm

Step-by-step explanation:

Diameter of drill bit (D) =20 mm

thickness of the MS plate (T) = 20 mm

depth of the cut (d) = (D+T) /2= 20 mm