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Normal drill wear

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

Maximum wear prior to regrinding

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 321
3,00 – 6,000,200,200,20
6,01 – 10,000,250,200,20
10,01 – 14,000,250,250,25
14,01 – 17,000,300,250,25
17,01 – 20,000,350,300,30
Crater wear (KB) in mm
AreaBereich
Drill diameter in mm 321
3,00 – 6,000,200,200,20
6,01 – 10,000,250,250,25
10,01 – 14,000,300,300,30
14,01 – 17,000,300,300,30
17,01 – 20,000,350,350,35