Milling Cutters Selection and Maintenance Guide
Milling cutters are rotary cutting tools used in milling machines to remove material. The right cutter selection maximizes productivity and surface finish quality.
I. Cutter Types and Selection
- End Mills: For profiling, slotting, and contouring. Select flute count based on application: two or three flutes for aluminum, four or more for steel.
- Face Mills: For large flat surfaces. Higher lead angles reduce cutting forces and improve surface finish.
- Ball Nose: For 3D contouring and complex surfaces. Smaller diameter for fine detail, larger for roughing.
- Corner Radius: Combines the strength of a round insert with the profiling capability of a square insert.
II. Setup and Operation
- Select the appropriate tool holder. Hydraulic or shrink-fit holders provide the best concentricity and rigidity.
- Check cutter runout. Excessive runout causes uneven insert loading and poor surface finish.
- Use climb milling whenever machine rigidity allows. Conventional milling for older machines or when cutting hard surface layers.
- Program appropriate radial and axial depths of cut based on cutter diameter and material
III. Maintenance
- Inspect cutter body for wear, damage, or bellmouthing of insert pockets
- Clean insert pockets thoroughly before installing new inserts
- Check and replace worn insert screws; stretched screws do not hold inserts securely
- Store cutters in protective holders to prevent cutting edge damage
- Send cutter bodies for inspection and reconditioning after extended use
