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In twist drills.... (small/large) point angle and ...(small/large) helix angle are provided for drilling soft, low strength steel.
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- Small point angle large Helix angle Point angle similar to SCEA by increasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material
- Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. lower back rake angle gain for soft & ductile material
- Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle loss for soft & ductile material
- Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material
Correct Option: D
Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material
