In October 2026 I re-checked every calculation from the original project. The force model had errors, and some loads were up to 30 times too high.
Spur radial forces had been computed as Ft / tan α instead of Ft · tan α, the bevel wheel force components were swapped, and the output gear force used the pinion diameter. I rebuilt the loads from a full 3D shaft model. On the in-line intermediate shafts the two tangential forces add instead of cancelling, and the axial force on the overhung bevel pinion reduces the bending moment at the bearing.
With the corrected loads, gears and shafts still pass. Four bearing positions did not reach the 30,000 h life, and a surface pressure (pitting) check showed through-hardened steel was not enough for stages 2 and 3.
| Shafts | All four verified with corrected loads |
| Gear steel | Moved to case-hardened 18CrNiMo7-6 after the pitting check |
| Shaft 2 bearings | Pair of 32314 J2/Q, over 170,000 h |
| Shaft 3 bearings | NUP / NU 2218 ECP, about 59,400 h, same bore and outer diameter |
| Bevel face width | 90 to 80 mm, bending check still met |
