06 Mar
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 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