Page 640 - Yamawa_European_Catalogue_YEU21

3. Flutes

Intro

Major functions of flutes are
SP 1) Chips’ pocket, 2) lubricant supply route, 3) rake angle formation, 4) to determine cutting amount in relation to the number of chamfer
threads. All are very important. Taps’ fl utes are classifi ed into following groups by tapping methods, fl uting method, tapping direction, and
hand of screw thread.

SL Straight Straight fluted tap for
blind and through hole

PO Spiral
Cutting type

Left Hand Spiral
ST

Spiral point Spiral pointed tap
Flutes of tap for through hole
ROLL

with oil groove Roll tap for blind
CARBIDE and through hole
Forming type

without oil groove Roll tap for blind
LONG and through hole

HAND Type of Flute
TAPS
Type of tap Type of tap
Cutting type Forming type
Flute Flute
EG (STI)
Straight Flute With oil groove

SPECIAL
THREADS,
GAUGES Spiral Flute

THREAD
MILLS Spiral Point Without
Flute oil groove

DIES

CENTER In general, the number of fl utes for cutting taps usually increases as the diameter becomes larger. However, it is also infl uenced by tap’s
DRILLS strength and rigidity, the accomodation of chip, the amount of cutting, and lubricant supply system.

Technical
info

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