Greetings, I wielded the crowbar and bought a set of Triumph twist drills. Today I was fussing with the fence on the DP and gashed my finger on the _side_ of the drill. I'd never known twist drills could be sharp there! (Yes, it was unplugged and the yellow thingie was out of the switch.)
Shoulda worn gloves... ;^)
All but the smaller sizes of twist drills are ground with "back taper": the tip has a greater diameter than the shank to prevent binding in the hole. The edge(s) are sharp throughout the entire length of the flutes, however it is the 'other [perpendicular] end' that actually does the cutting: the lip, extending from the chisel edge to the periphery.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.