- 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