All of our Hirth Gears are made of a special Chromium-Molybdenum (41xx Series) steel.
The gears are rough machined, thermally annealed, semi-finished machined with a roughing of the Hirth Teeth and finally thermally stressed relieved.
The diameters and faces are rough ground using Danobat CNC grinders and the teeth induction hardened to HRc54 ±2 surface hardness.
The gears are precision ground again on their faces, both inside and outside diameters using Mägerle and Voumard grinders.
The Hirth teeth are semi-finished ground, unclamped and then re-clamped for a final grind holding extreme accuracies on new Mägerle CNC grinders.
Matching Hirth type face gears are ground parallel to 0.0005 mm using Mägerle grinders and inspected on Zeiss coordinate measurement machines.
Standard indexing accuracies of ±1 arc second.
Case hardened teeth using chromium-molybdenum steel make our gears resistant to wear.
Numerous teeth provide rigid locking allowing for great machining forces to be applied to the gears
All of our gears are self-centered providing very low axial and radial run-out.