How to choose the right turning insert geometry?

There are three basic types of turning grooves, suitable for finishing cutting, medium cutting and rough cuttining. The chip breaker type of the blade is selected according to different machining operations and machining materials. The following introduces  the three basic machining operations.It also showed the preferred chip breaker type of CNMG120408 blade

• Finishing Cutting

Finishing is done with shallow depths of cut and slow feed rates. Only minimal cutting forces are required. Finishing aims to improve the surface and dimensions of the workpiece, with a focus on accuracy rather than speed. The inserts are durable and thermally stable, with a strong tolerance to edge build-up and pitting wear, which greatly extends tool life while ensuring good surface finish and cutting accuracy.

For CNMG120408 inserts

FP FH chipping geometry is generally considered one of the best choices for finishing carbon steel and alloy steel.

• Medium Cutting

Semi-finishing is a cutting process performed between roughing and finishing operations to eliminate deformation of the workpiece after roughing or heat treatment.

For CNMG120408 inserts

1. MP: First recommendation for medium cutting of carbon steel and alloy steel.
2. MM:First recommendation for medium cutting of stainless steel.
3. MK:First recommendation for medium cutting of cast iron.
4. MS:First recommendation for medium cutting of difficult-to-cut materials.

• Roughing Cutting

Roughing is a process of deep cutting with high feed rates. The goal is to quickly remove excess material. The process focuses on speed rather than precision and requires the most advanced safety levels. This step is also a better preparation for the subsequent processing.

For CNMG120408 inserts

1. RM:First recommendation for rough cutting of stainless steel
2. RK:For rough cutting of carbon steel, alloy steel and First recommendation for rough cutting cast iron
3. RS:First recommendation for rough cutting of difficult to-cut materials

• Summarize

In general, before choosing the right blade chip breaker, you need to determine the processing process, whether it is to quickly remove the excess part of the material surface and focus on speed, or to make detailed cuts and focus on precision. In addition, you must also consider the hardness of the processed metal to choose the right blade.