OPTIMUM
M A S C H I N E N - G E R M A N Y
Version 1.0.1 2014-05-16
Page 137
Original operating instructions
TU2506 | TU2506V | TU2807 | TU2807V
GB
3.24.3 Indexable inserts
For indexable inserts there are partial profile and full profile indexable inserts. The partial pro-
file indexable inserts are designed for a certain pitch range (e.g. 0.5 - 3 mm).
The partial profile indexable insert is optimally appropriate for the single-piece production.
The full profile indexable insert is only designed for a certain pitch.
Determining the machining method of right-handed and left-handed threads:
Right-handed tool holders or drill rods are used. In order to top right-handed threads the feed
direction towards the clamping chuck is selected and the machine spindle turns to the right (the
turning direction of the machine spindle is determined when you look into the spindle from the
rear side). If a left-handed thread is to be tapped, the feed direction is selected away from the
clamping chuck in direction to the tailstock and the machine spindle turns to the right.
As for thread cutting there are other conditions as for longitudinal turning, the forward cutter
must show a larger clearance as the pitch angle of the thread.
Img.3-45:
partial profile
indexable insert
Img.3-46:
full profile indexa-
ble insert
Img.3-47:
right-handed
thread with the
machine spindle
turning to the
right
Img.3-48:
left-handed
thread with the
machine spindle
turning to the
right
Feed direction
Feed direction
Img.3-49:
Pitch angle
Pitch angle
Pitch
P
Core d
iameter
Flank diameter
T
h
read diameter
tan
P
D
2
-----------------
=
