straight flute การใช้

• Regular twist drills or straight fluted drills have 2 lands to guide them through the hole.
• Straight fluted extractors have less wedging effect than tapered screw extractors, so have less tendency to lock the screws into place.
• Straight fluted extractors may come in a kit that also has associated drills, drill bushings, and special nuts, or be sold individually.
• However, the straight flute is poor at chip ejection, and can cause a burr to be formed on the exit side of the hole, more so than a spiral twist drill bit turning at high speed.
• "' Gun drills "'are straight fluted drills which allow cutting fluid ( either compressed air or a suitable liquid ) to be injected through the drill's hollow body to the cutting face.
• There are two types : one has a spiral flute structure, commonly called an "'easy out "'after the trademarked name " EZ-Out "; the other has a straight flute structure.