Sandvik Coromant Silent tools - application guide - Manual (Page 60)

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4 x BD 3 x BD 3 x BD
6 x BD 5 x BD 5 x BD
10 x BD 5 x BD* 5 x BD*
14 x BD 7 x BD 7 x BD
3. Turning
Bar types
Internal turning is very sensitive to vibration. Minimize the tool over-
hang and select the largest possible tool size in order to obtain the
best possible stability and accuracy. For internal turning with steel
dampened boring bars, the first choice is bars of type 570-3C.
For grooving and rough threading operations where the radial forces
are higher than in turning, the recommended bar type is 570-4C.
The table below shows the maximum recommended overhang for
different bar types.
The static stiffness of a carbide reinforced bar is improved by about
2.5 times compared to a steel bar with the same overhang.
Bar type
Steel boring bars
Turning Grooving Threading
Carbide boring bars
Steel dampened
boring bars
Carbide reinforced
dampened boring bars
* 570-4C bars
There are different dampening systems for different overhang
lengths: