19 Jul
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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
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