Общий каталог FANAR 2021 - страница 311

C1 D1 C6 C5 C2 G1 C4 D2 C3 i Technical information 8. TWIST DRILLS 8.1. Nomenclature of Twist Drills A F E D C B B L2 L3 L4 L1 A with no web with web thining thining C - channel supplying coolant H D - chip flute J G E - margin F - rake face G - primary clearance surface H - secondary clearance surface I - chamfer J - chamfer edge I L1 - total length L2 - chip flutes length A-A L3 - margin length G2 L4 - shank length D5 D1 - working part diameter D2 - shank diameter D3 - core diameter D3 D4 - spacing of cooling channels D5 - diameter of cooling channels C1 - point angle C2 - Helix angleC3 - chisel angle D4 B C4 - clearance angle C5 - angle of primary clearance surface C6 - angle of secondary clearance G1 - margin width G2 - lowering of margin B - blade width B-B Types of Drill Clearance Surfaces Four faced Conical (eccentric) 12 308