Flutes ■Major functions of flutes are : Description of products 1) Chips' pocket, 2) lubricant supply route, 3) rake angle formation, 4) to determine cutting amount in relation to the number of chamfer threads. And all are very important. Taps' flutes are classified into following groups by tapping methods, fluting method, tapping direction, and hand of screw thread. Straight Hand tap Spiral Spiral fluted tap for blind hole Cutting type Left Hand Spiral Spiral fluted tap for through hole Flutes of tap Spiral point Spiral pointed tap with oil groove Roll tap Forming type without oil groove Roll tap ■Type of Flute Type of Taps Cutting type Type of Taps Forming type Flute Flute Straight Flute With oil groove Spiral Flute Spiral Point Without oil Flute groove In general, the number of flutes for cutting type taps are usually increased as O.D. becomes larger. However, it is also influenced by tap's strength and rigidity, Information Technical the accomodation of chip, the amount of cutting, and lubricant supply system. Technical-2 773