Percision Hirth Gears

Process & Materials

Material
All of our Hirth Gears are made of a special Chromium-Molybdenum (41xx Series) steel.

MANUFACTURING

Milling of Teeth
The gears are rough machined, thermally annealed, semi-finished machined with a roughing of the Hirth Teeth and finally thermally stressed relieved.

Grinding of the Teeth
The diameters and faces are rough ground with the teeth being induction hardened to a RC58 +2 surface hardness using Danobat CNC grinders.

Grinding of the Surface
The gears are precision ground again on their faces, both inside and outside diameters using ELB and Voumard grinders.

Final Grinding & Inspection
The Hirth teeth are semi-finished ground, unclamped and then reclamped for a final ground holding extreme accuracies on new Magerle CNC grinder.

Matching Hirth type face gears are ground parallel to .002mm (.00008") or better using ELB grinders and inspected on Rank Taylor Hobson and Sip Mul 300 measurement machines.

KEY BENEFITS


Product Features
Standard indexing of accuracies of +3 arc seconds. Special accuracies of +1 arc seconds are available upon request.

RESISTANT TO WEAR
Case hardened teeth using chromium-molybdenum steel, make our gears resistant to wear.

POSITIVE LOCKING
Numerous teeth provide rigid locking allowing for great machining forces to be applied to the gears.

SELF-CENTERING
All of our gears are self-centered providing very low axial and radial run-out.