Page 35 - Threading_Handbook

2.3.2 Anvils for Laydown Inserts

The parameter for tilting the threading insert relative to the helix angle of threading is of great
importance when threading is produced. This parameter ensures proper operation of the
insert during threading production in terms of equal load distribution applied to the insert,
equal distribution of forces operating on the insert, development of uniform wear on both THREAD TURNING
sides of the cutting edge, and avoiding friction of the insert with the side of the threading
profile. If the side clearance insert angles (α) are not equal in relation to the helix angle (φ),
the insert must be tilted. This is performed by using anvils.

Recommended Less Recommended

αL≠αR αL=αR
φ φ

β β =0

α R
α R
α L α L

Quick and Easy way to Select a Correct Anvil

Helix (Lead) angle or Helix (Lead) angle area
calculation by formula from the graph

Recommendation for an
inclination angle (β°) according
to the thread turning method
definition and dependent
on the thread standard

Recommendation for a suitable
anvil according to the insert size
and type of toolholder
(internal or external)

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