Mechanical Engineering - Production Engineering - Discussion

Discussion Forum : Production Engineering - Section 4 (Q.No. 4)
4.
The helix angle of a drill is more than 30° for drilling aluminium.
Agree
Disagree
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
8 comments Page 1 of 1.

Dileep said:   5 years ago
STANDARD DRILLS STANDARD (25° - 30°)---> it is most suitable for drilling of steel cast iron, alloy steel, and malleable cast iron and possible to drill stainless drill, a brass shallow hole of aluminium alloy, nickel and almost all kind of material.

HIGH HELIX DRILLS HIGH (34°-40°) --->This is most suitable for drilling of nonferrous metal of aluminium, die-casted alloy, magnesium alloy, zinc, copper etc., and deep hole of them and possible to get the fine result of normal drilling and deep-hole drilling for stainless steel having good machinability.

LOW HELIX DRILLS LOW (17°-23°) ----->This is most suitable for drilling of Bakelite, moulded plastics, fiber, hard rubber and suitable for drilling of soft type BRASS and magnesium alloy.
(1)

Virat said:   4 years ago
For soft materials greater than 30 degrees.

For hard materials less than 30 degrees.
(1)

Pravin said:   8 years ago
Aluminium is a soft material so it has to be less than 30°.

Abhi said:   7 years ago
No @Pravin.

For aluminium it should be more than 30°. So answer is correct.

S Bera said:   7 years ago
For soft material, helix angle is more than 30degree. For hard material angle is less than 30 degree.

Biren said:   7 years ago
It's around 45°.

Karthik raja said:   5 years ago
For ductile material, the helix angle is greater than 30° and the brittle material less than 30°.

S. Saha. said:   5 years ago
Drill helix angle 45 to 48 degree for soft material.

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