Sandvik Coromant Threading - Manual (Page 54)

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3. Products - thread turning
Dampened 4C Silent Tools bars – vibration-free
internal threading
For internal threading operations - where radial forces are higher
than in external threading - the recommended bar type is 570-4C.
570-4C bars are developed primarily for internal threading applica-
tions. The combination of Silent Tools adaptor and fl ank infeed is
recommended for overhangs of up to 5 x D, to combat axial and
radial cutting forces.
• Unique dampening - reduces largest vibration
• Coromant Capto Coupling
• Flexible SL system
• Excellent surface fi nish
• Handles directional cutting forces
The 4C system is available as standard. The SL coupling at the
front end enables a large number of cutting tool combinations from
a small tool inventory, and is to be used primarily with CoroThread
266 cutting heads.
It is recommended to minimize the tool overhang and select the
largest possible tool diameter for best stability and accuracy.