HELIX GEOMETRY

When Does a Variable Helix Help?

A variable-helix end mill uses more than one helix angle. The intention is to change the regular timing at which cutting edges enter the workpiece.

Educational technical guide · Values must be confirmed for the actual application

Why use different angles?

Regular engagement intervals can reinforce vibration under certain conditions. Varying the timing can help reduce this tendency and support a more stable cut. Results still depend on overhang, clamping, machine condition and the operation.

ALPINE STABIL geometry

The catalogue identifies STABIL with a 39.5°/40.5° variable helix and corner radius. It is a four-flute, TiAlN Nano-coated HRC60-class family with a focus on pre-hardened and tempered steels below HRC50.

System rigidity comes first

A variable helix cannot correct excessive overhang, weak workholding, poor runout or an unstable holder. These mechanical conditions should be checked first.

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