673 Каталог INGERSOLL 2011 Режущий инструмент и инструментальная оснастка Стр.675

Каталог INGERSOLL 2011 Инструмент и оснастка Стр. 675 0673 Lab2u

SPOTTING DRILL RECOMMENDATIONS SPOTTING DRILL RECOMMENDATIONS FOR SOLID CARBIDE AND QWIK TWIST DRILLS BEST Spotting drill angle is greater than the drill point angle. First contact is at the drill point. Best drill centering possibility. Drill loading increases with penetration. ACCEPTABLE Spotting drill angle is the same as the drill point angle. Tool loading problems can occur due to immediate full engagement. Chatter may be a problem. Reduced feed at entry recommended. Good drill centering. NOT RECOMMENDED WITH CARBIDE Spotting drill angle is less than the drill point angle. Point contact along cutting lips or corner - drill point should contact spotted hole first.. Chipping likely in these areas. 675