Sandvik Coromant Silent tools - application guide - Manual (Page 61)

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3. Turning
Select boring bar material to suit the appropriate length to diameter
ratio. A carbide bar has a higher static stiffness than a steel bar,
which is why a larger overhang can be allowed.
As seen in the figure, the following boring bar materials can be
selected to suit the appropriate length to diameter ratio.
Threading and grooving give more radial cutting forces than turning,
which limits the recommended maximum overhang. A dampening
mechanism increases the dynamic stiffness and allows even larger
overhangs.
1 = solid steel bar
2 = carbide bars
3 = steel dampened, short
version 4–7 x BD
4 = steel dampened, long
version 7–10 x BD
5 = carbide reinforced
dampened boring bar
10–12 x BD &
12–14 x BD