Обший каталог Yamawa 2016 - 2017 - страница 778

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Edge angle and Cutting allowance of taps

■Cutting angle and Chamfer relief angle ■

θ : Cutting angle γ : Chamfer relief angle

Chordal Hook Angle Rake Angle Tangential Hook Angle

γ γ γ

θ θ θ

Cutting angle of hook face. The angle between theCutting angle of rake face. The angle between theCutting angle of hook face. The angle between the
center line passing the cutting edge and the straightcenter line passing the cutting edge and the straightcenter line passing the cutting edge and the straight
line linking the cutting edge with the thread root.line linking the cutting edge with thread root.line tangent to the rake face on the cutting edge.

■Thread relief

S : Indicator drop for thread relief

Concentric-unrelieved Con-eccentric thread relief Eccentric thread relief

(A)

(B)

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

The amount of cut portion Land A Please refer to the pictures shown. In such taps as have 4 flutes and 3 thread chamfer, the Land D

cutting operation progresses in order from the edge of

A1, B1, C1, D1…A2, B2…A4. Tap end is usually smaller Land B Land A

than the size of bored hole, and A1 may not make any

cutting operation. Land C

Land B t : Amount of cut portion per blade

Ck25 Ck35 Ck45 Ck60 42 CrMo 4 25 35HRC, 35 45HRC X5 CrNi 18 9, X5 CrNiMo 17 12 2 X 210 Cr 12, X 40 CrMoV 5 1

GG-25 GGG-50 E-Cu57 CuZn37, CuZn35Pb1 CuSn6 AlMn1Cu G-AlSi7Mg EN-MC21120 GD-ZnAl4 Bakelite (Phenol-PF)

PVC, Nylon TiAl6V4 NiCr 15 Fe 7 TiAl NiCr22FeMo, NiCr20Ti

Land C

Land D

Bored hole diameter Tapping direction