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Under ideal conditions, uniform wear should be seen along the entire cutting edge. 

  • Cutting speed OK
  • Feed rate OK 
  • Drill and workpiece are clamped correctly

Drilling tools should be reground when the wear land has grown to a specific width (VB) along with a certain amount of cratering (KB). 

  1.  Rake face
  2. Circular land
  3. Flank
  4. Area
  5. Drill centre 
Maximum flank wear (VB) in mm
  Area
Drill diameter in mm  3 2 1
3.00 – 6.00 0.20 0.20 0.20
6.01 – 10.00 0.25 0.20 0.20
10.01 – 14.00 0.25 0.25 0.25
14.01 – 17.00 0.30 0.25 0.25
17.01 – 20.00 0.35 0.30 0.30
Crater wear (KB) in mm
  Area
Drill diameter in mm  3 2 1
3,00 – 6,00 0.20 0.20 0.20
6,01 – 10,00 0.25 0.25 0.25
10,01 – 14,00 0.30 0.30 0.30
14,01 – 17,00 0.30 0.30 0.30
17,01 – 20,00 0.35 0.30 0.30