Hampshire-based Horn has introduced a range of small circular interpolation mills with nine teeth designed for high productivity and long tool life. Groove, cut-off and gear milling are just three processes that the circular interpolation milling system now performs even more productively following the introduction of a range of tools with nine cutting edges. The system can be used from an inside dia of 8mm for precise boring of grooves down to 0.25mm wide, or for milling splines — standard tools and special variants are available.

Smaller diameter circular interpolation mills from Horn were previously available with exchangeable heads having a maximum of six teeth. Three extra cutting edges offer higher material removal rates, raising productivity by shortening cycles and at the same time extending tool life. In addition, the cutters run more quietly and with less vibration compared to tools having fewer teeth. The dimensional accuracy and surface finish of components are consequently improved.

The new nine-edged milling systems M911, M913 and M928 are stocked in widths from 1.5 to 3mm. Maximum milling depths are 3.5, 4.5 and 6.5mm respectively. The cutter heads are available with different coatings to suit the material being machined. Due to its mass, the solid carbide tool shank ensures vibration damping during milling. All variants of the shank are designed for internal coolant supply.