Machining Recommendations

Always machine from the outer diameter towards the centre.

• During the first face grooving pass it is difficult to disperse broken chips and can lead to problems such as a chipped insert.
Maintain longer chips that disperse easily by decreasing the feed per rotation.

• When chips become too long, use peck feed to break them into a suitable length.

• When machining a face groove in several passes, machine from the outer diameter towards the centre so that space for discharging chips is created to prevent insert damage caused by chip jamming.

• Plunging width of cut is recommended to be set at 60 - 80% of the insert width. This enhances the effect of the chipbreaker by enlarging the width of the groove to improve chip dispersal.

• When face groove machining by using plunge feed and traverse machining, always machine from the outer diameter towards the centre to disperse chips outward to avoid chip jamming problems.

• Set the depth of cut within 40% of the insert width.

When infeed machining at the bottom of a deep groove, chips may interfere on the cutting edge near the centre wall.
In such cases, stop infeed machining just before the centre wall (at a point less than the insert width) then remove the remaining material by plunging.

With the BM breaker insert, 3 dimensional copying is possible. Set the depth of cut (APMX 2) to 30% less than the insert width.

When finish cutting, machine continuously from the outer wall to the bottom of the groove, then finally plunge cut the centre wall.

Carry out finishing in one process. For the depth of cut (APMX 2) when back turning, refer to the table on the right.