pressbrake1 Member Messages 5,736 Location Essex Dec 7, 2019 #1 ive seen a few threads questioning helix speed on twist drills. Heres a dormer advert from my 1932 ‘machinery’s magazine
ive seen a few threads questioning helix speed on twist drills. Heres a dormer advert from my 1932 ‘machinery’s magazine
A awemawson Forum Supporter Messages 4,805 Location East Sussex, UK Dec 7, 2019 #2 . . . . Then there's the Chinese drills that alter their helix as you use them . . .
