Grooving

Choose the shortest possible bar, with the biggest possible diameter. As this is the most difficult internal turning operation, the maximum diameter-to-length ratio, even for a tuned bar, is most often in the area of 1:5. For a solid steel bar it is most likely to be close to 1:2

To minimize the deflection of the tool, use a narrow insert, and make your groove with several insertions, each increasing the groove width by max 80 % of the insert width.

The required width can also be achieved by shallow insertions followed by longitudinal turning.

In both cases, a finishing cut is normally required to complete the groove.

A positive insert with sharp cutting edges, like the -5E geometry is the first choice for internal grooving.

Silent Tools® is a definition of tool holder made to reduce vibrations due to a damper inside the tool body and is a trade mark of Teeness ASA. Damped boring bars are designed for high productivity, close tolerances and overhang beyond 4 x the bar diameter.