P. Drag cut             1. Parallel cut
Q. Burn cut            2. Horizontal half wedge cut
R. Pyramid cut      3. Vertical half wedge cut
S. Fan cut               4. Double wedge cut

  • P-1, Q-2, R-3, S-4
  • P-2, Q-1, R-4, S-3
  • P-3, Q-1, R-4, S-2
  • P-4, Q-1, R-3, S-2
  • cross bit
  • button bit
  • rotary roller bit
  • button drag bit
  • Impact action
  • Rotary action
  • Both (a) & (b)
  • Cutting and ploughing
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