19 Jul
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20 Apr
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... read more
06 Mar
Dimensions Technical data of Twist Drill Bits
Drill Diameter The values indicated in the relevant dimensional standards apply in respect of the diameter of Twist Drills Test Point : on the leads at the corners（see Fig.1 ) Test equipment: micrometer Tapering of Diameter The diameter of twist drills usually reduces from the drill tip towards the... read more