Mechanical Engineering - Production Engineering - Discussion
Discussion Forum : Production Engineering - Section 7 (Q.No. 1)
1.
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
Discussion:
26 comments Page 1 of 3.
Mahmoud said:
1 decade ago
How it is calculated ?
Rohit said:
1 decade ago
It's wrong. Depth of cut = D/2 in a drilling operation by a drill bit.
Kiran kumar said:
1 decade ago
What is the formula used?
Bhanu Teja said:
1 decade ago
Depth of cut is .5D for through hole and .3D for blind hole.
Baahubali said:
1 decade ago
Plate thickness is only 20 mm, so depth of cut 20 mm.
Anthony Hormenoo said:
9 years ago
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.
P das said:
9 years ago
Depth of cut is equal to the half of drill diameter. So depth of cut is 20/2=10mm.
DIBYARANJAN MAHANTA said:
9 years ago
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.
Hareesh said:
8 years ago
0.5d is not a depth of cut it is a cap means compulsory approach angle.
Raju said:
8 years ago
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.
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.
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