Page 44 - Threading_Handbook

Recommendation for a Suitable Anvil According to the Insert Size and
THREAD TURNING • Suitable anvil for external or internal toolholder depending on the
Type of Toolholder

insert size and considering the obtained Inclination Angle (β°)

• Defined anvils for Inclination Angle: β=2.5°
Thread Turning Method
Production of right-hand threading
Production of left-hand threading
with left-hand holder
with right-hand holder

RH or LH LH
RH

Anvil Selection
Threading Helix φ (φL)≥5º 4º≤φ (φL)<5º 3º<φ (φL)≤4º 2º<φ (φL)≤3º 1º<φ (φL)≤2º 0º<φ (φL)≤1º
(Lead) Angle φ (φL)
Inclination Angle β 4.5º 3.5º 2.5º 1.5º (std) 0.5º

I(d) Toolholder Anvil Designation
16 EX RH OR IN LH AE 16+4.5 AE 16+3.5 AE 16+2.5 * AE 16+1.5 AE 16+0.5
(3/8) EX RH OR IN LH AI 16+4.5 AI 16-3.5 AI 16+2.5 * AI 16+1.5 AI 16+0.5
22 EX RH OR IN LH AE 22+4.5 AE 22+3.5 AE 22+2.5 * AE 22+1.5 AE 22+0.5
(1/2) EX RH OR IN LH AI 22+4.5 AI 22+3.5 AI 22+2.5 * AI 22+1.5 AI 22+0.5
27 EX RH OR IN LH special AE 27-4.5 AE 27+3.5 AE 27+2.5 * AE 27+1.5 AE 27+0.5
(5/8) EX RH OR IN LH solution AI 27+4.5 AI 27+3.5 AI 27+2.5 * AI 27+1.5 AI 27+0.5
22U EX RH OR IN LH AE 22U+4.5 AE 22U+3.5 AE 22U+2.5 * AE 22U+1.5 AE 22U+0.5
(1/2U) EX RH OR IN LH AI 22U+4.5 AI 22U+3.5 AI 22U+2.5 * AI 22U+1.5 AI 22U+0.5
27U EX RH OR IN LH AE 27U+4.5 AE 27U+3.5 AE 27U+2.5 * AE 27U+1.5 AE 27U+0.5
(5/8U) EX RH OR IN LH AI 27U+4.5 AI 27U+3.5 AI 27U+2.5 * AI 27U+1.5 AI 27U+0.5

Positive Anvils

Feed Towards the Chuck

+φ (φ L)
+β

1.5°
const.

44 ISCAR