Cutting Portion,Web thickness,Margin width of Twsit Drill

Cutting Portion
  • σ=Point angle
  • Ψ=Chisel egde








Web thickness K
  • Test values: the web thickness according to Fig.1 shall not be less than the minimum value K(min) indicated in Fig.2.
  • Test point: at the point of the drill
  • Test equipment: slide gauge with measuring points


Margin width b
  • Test values: the land width as in Fig.3 shall lie within the limitting values indicated in Fig.4.
  • Teseing equipments: slide gauge





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