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The purpose of helical grooves in a twist drill is to
1. Improve the stiffness
2. Save a tool material
3. Provide space for chip removal
4. Provide rake angle for the cutting edge
Select the correct answer suing the codes given below:
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- 1 and 2
- 2 and 3
- 3 and 4
- 1 and 4
Correct Option: C
Flutes gives the chip removal space & also provide rake angle which is minimum at centre & equal to helix angle at periphery
