Page 424 - ISCAR(TURNING-CATALOG-42-2022)

USER GUIDE
GROOVE-TURN Machining Tips Internal Machining

Correct grooving sequence
When making a groove where the insert’s width is not
Improving Internal Turning in a Blind Hole
identical to the groove, it is recommended to select an
Internal turning in a blind hole brings about the
insert that will enable grooving symmetrically in such
problem of chip exit. When the tool reaches the rear
a way that the material is always in the center
of the insert. This practice will ensure better
and the insert, possibly causing insert breakage.
chipbreaking and symmetrical cutting forces.
Two solutions that can eliminate this problem:
1 side wall, chips may be caught between the wall
First Solution
1 Start by grooving at the rear wall.
2 Continue by turning from the inside toward the outside.

2 1
2

3

Second Solution
1 Start by grooving at the rear wall.
2 Pull the tool back toward the outside.
3 Turn the final diameter from outside, toward the groove.
Eliminating a “Hanging Ring”
When turning at the end of a bar or towards a recess 1 2 3
between two walls, a “hanging ring” may be formed. 5 4
TEXT To eliminate the unwanted “hanging ring”:

1

1 Turn toward the recess. Stop a short Optimizing Internal Machining Toolholder Overhang
distance before reaching the recess. It is always recommended to use the minimum possible
3 4 overhang in order to maintain maximum toolholder
2 rigidity. As a general rule, maximum overhang should
not exceed three times the holder-bar diameter.
Lmax.≤3D

¯D
2 Pull back the groove-turn tool and re-position it.
5

LÊmax.

3 Machine as shown. This final operation achieves
the size and flatness of the side wall.

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