Mechanical Engineering - Production Engineering - Discussion

The depth of cut in this drilling operation can be calculated by multiplying the feed rate (0.2 mm/revolution) by the number of revolutions required to drill through the entire thickness of the mild steel plate (20 mm).

To find the number of revolutions, we can divide the thickness of the plate (20 mm) by the feed rate (0.2 mm/revolution):

Number of revolutions = Thickness of plate/Feed rate.
Number of revolutions = 20 mm/0.2 mm/revolution.
Number of revolutions = 100 revolutions.

Therefore, the correct answer is d. 100 mm.

This problem is not about calculating but it rather a logical question or mind test. They have described how the drill is and its action, by giving its diameter, speed and feed rate, but what are they after? the depth of cut in the drilling operation. Therefore, if the thickness of plate they are drilling through is 20mm then logically the depth drilled or cut is 20mm.

In a drilling operation, the depth of cut is measured at right angles to the axis of the drill, i.e. the direction of feed, and is numerically equal to one-half of the diameter of the drill. It can be expressed as:

The depth of cut = (Drill dia/2) mm.

For through-hole depth of cut is 0.5D and for the blind hole, 0.3D, here D = 20mm and the case of through hole, so the depth of cut = .5 * 20 = 10mm and depth of cut are not equal to the depth of the drill to be produced.

I totally agree @P Das.

The depth of cut of the drill is half of the diameter of drill thus the other parameters are a source of confusion to us.

Given that d =20mm.
T =20mm.
D2 = 2T+ D1(hollow)
D2 = 60.

We know that D2-D1/2 is the formulae.
So answer is 60-20/2.
= 20mm.

What is the depth of cut in drilling?

Depth of cut is half the diameter of drill diameter. Right? Please explain.

You are right @Mahanta.

The Depth of cut is the depth of the hole we made in drilling.

Depth of cut is equal to the half of drill diameter. So depth of cut is 20/2=10mm.

0.5d is not a depth of cut it is a cap means compulsory approach angle.