Общий каталог Yamawa 2022 - 2023 - страница 1152

Terminology of Taps Flutes

Width of land Shank dia. Chamfer angle Flute

External center Core dia. Internal center Chamfer length Size of square Thread length Shank length Length of square Overall length

■Chamfer relief ■Thread relief and cutting angle

Width of margin

Chamfer relief Thread relief Heel Indicator drop for thread relief Indicator drop for chamfer relief

■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

Spiral Spiral fluted tap for blind hole Cutting type

Left Hand Spiral Spiral fluted tap for through hole

Spiral point Spiral pointed tap Flutes of tap

with oil groove Roll tap

Forming type without oil groove Roll tap

Spiral Flute

■Chamfer of hand tap

Taper tap threads

In general, tap chamfer is the most important part of taps to create internal thread. The function of full thread part of taps is to make a 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, Technical Inf the accommodation of chip, the amount of cutting, and lubricant supply system. guidance.