Общий каталог Yamawa 2021 - страница 638

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4. Cutting angle and thread relief

Cutting angle and Chamfer relief angle θ: Cutting angle γ: Chamfer relief angle

SP

Chordal Hook Angle Rake Angle Tangential Hook Angle

SL

PO

Cutting angle of hook face.Cutting angle of rake face.Cutting angle of hook face.
The angle between the center line passingThe angle between the center line passingThe angle between the center line passing
the cutting edge and the straight line linkingthe cutting edge and the straight line linkingthe cutting edge and the straight line tan-
the cutting edge with the thread root.the cutting edge with thread root.gent to the rake face on the cutting edge.

ST

ROLL

Thread relief S: Indicator drop for thread relief

Concentric-unrelieved Con-eccentric thread relief Eccentric thread relief

(A)

(B)

CARBIDE

LONG

HAND

TAPS

EG (STI)

No relief exists at land. Start (A) and heel (B)Radial relief in the thread form starts at theRadial relief in the thread form starts at the
of thread land have same concentricity.back of a concentric margin.cutting edge and continues to the heel.SPECIAL

THREADS, GAUGES Land A The amount of cut portion

THREAD

Please refer to the pictures shown. For the taps with MILLS Land D 4 fl utes and 3 threads chamfer, the cutting operation progresses in order from the edge of A1, B1, C1, D1… Land B Land A A2, B2…A4. Tap end is usually smaller than the size of bored hole, and A1 may not make any cutting operation. DIES Land C

Land B t: Amount of cut portion per blade

CENTER

DRILLS

Land C

Land D

Tapping direction Bored hole diameter