Technical Considerations

  • Always use anti-seize compound on threads and screw body.
  • Thoroughly clean insert pocket and insert mounting surfaces at each index to maintain best concentricity.
  • Change insert screw every 10 inserts (20 edges).
  • Use high-quality tool holders for rigidity and concentricity: milling chucks, heat-shrink and mechanical shrink holders are recommended; collets and end mill holders are not recommended.
  • Cutter bodies will wear and fatigue over time; inspect tool before each use.
Recommendations for ball nose finish milling


  • Maximum stock removal for semi-finishing should be less than 7% of the SBN diameter.
  • Optimum amount of finishing stock to leave is .005-.010".
  • Stepover should be greater than or equal to DOC.
  • Climb milling is preferred.
  • Compensate for Effective Cutting Diameter (see Feed, Speed & Diameter Compensation Table 1 and Fig.1).
  • Compensate for chip thinning with Feed Rate Adjustment (see Feed, Speed & Diameter CompensationTable 2).
  • Surface finish (RMS) is a function of stepover and feed per tooth.
  • Try to work within recommended surface footage and chip loads.
  • Decrease feed rate coming into corners to reduce chatter.
  • For long-reach applications, utilize the Carbide Shank/Carbide Core cutting tools for increased rigidity and reduced chatter.