Обший каталог Yamawa 2016 - 2017 - страница 777

Flutes

■Major functions of flutes are : 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

Flutes of tap

Cutting type

Spiral Spiral fluted tap for blind hole

Left Hand Spiral Spiral fluted tap for through hole

Spiral point Spiral pointed tap

with oil groove Roll tap

Forming type

without oil groove Roll tap

■Type of Flute

Type of Taps Type of Taps Cutting type 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, the accomodation of chip, the amount of cutting, and lubricant supply system.