Gears and transmission
Water-Powered High-Speed Gearbox v4 (error-reviewed)
- Bounding box
- 104.1 × 168.7 × 93.5 mm
- Engine
- Precision B-rep
- Parameters
- 73
- Published
- November 8, 2026
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The prompt
Water-powered high-speed gearbox after a full error review: pinion-end cover ears moved onto the arc so every screw hole has a 3.2 mm wall (was 2.15 mm), and the bottom-cap funnel now drains smoothly to the spout with no ledge; valve moved clear of the chamber, bolt ears, blends, chamfers and lead-ins retained
Parameters
| Name | Value | Range |
|---|---|---|
| Gear module | 0.8 mm | 0.6 – 1.5 |
| Pinion teeth (15+ avoids undercut) | 15 | 14 – 22 |
| Speed-up ratio (x:1) | 5 | 3 – 6 |
| Gear face width | 8 mm | 6 – 12 |
| Added centre distance (backlash) | 0.2 mm | 0.1 – 0.5 |
| Bore clearance on the 8 mm shaft | 0.2 mm | 0.1 – 0.4 |
| Pinion bore vs 3 mm axle (negative = tighter) | 0 mm | -0.1 – 0.2 |
| Bearing pocket diametral clearance | 0.2 mm | 0.05 – 0.4 |
| 608 outer diameter | 22 mm | 22 – 22 |
| 608 bore / 8 mm shaft | 8 mm | 8 – 8 |
| 608 width | 7 mm | 7 – 7 |
| 683 outer diameter | 7 mm | 7 – 7 |
| 683 bore / 3 mm axle | 3 mm | 3 – 3 |
| 683 width (each) | 3 mm | 3 – 3 |
| 683 bearings stacked at each end of the axle | 2 | 1 – 2 |
| 608 lip hole diameter | 16 mm | 12 – 19 |
| 683 lip hole diameter | 5 mm | 4 – 6 |
| Pinion stub diameter (bears on inner race) | 5 mm | 4.4 – 5.4 |
| Wet (turbine) chamber height | 28 mm | 24 – 36 |
| Partition thickness (wet/dry divider, holds the bearings) | 8 mm | 8 – 10 |
| Gear to wall gap | 2 mm | 1.5 – 4 |
| Axial end float | 0.4 mm | 0.2 – 0.8 |
| Gear tip to gear-housing wall | 3 mm | 2 – 8 |
| Gear housing wall | 4 mm | 3 – 8 |
| Turbine chamber wall | 6 mm | 5 – 10 |
| Turbine chamber inner radius | 45 mm | 42 – 52 |
| Gear spacer outer diameter | 11 mm | 9 – 12 |
| Drive flat depth on the 8 mm shaft | 0.6 mm | 0.3 – 1.2 |
| Output rod length beyond the cover | 20 mm | 10 – 40 |
| Number of buckets | 18 | 12 – 24 |
| Bucket inner radius | 28 mm | 24 – 32 |
| Bucket outer radius | 36 mm | 32 – 40 |
| Bucket depth (along the jet) | 11 mm | 9 – 14 |
| Bucket pocket radius | 3.3 mm | 2.5 – 4.5 |
| Bucket pocket offset from mid-plane | 3.9 mm | 3 – 6 |
| Bucket back wall thickness | 1.4 mm | 1 – 2.4 |
| Wheel web thickness | 6 mm | 4 – 10 |
| Wheel hub / splash shield diameter | 22 mm | 18 – 26 |
| Nozzle jet diameter | 3.5 mm | 2.5 – 5 |
| Flow bore | 8.4 mm | 7 – 10 |
| Valve body size (square) | 32 mm | 30 – 38 |
| Valve body and cap corner radius | 4 mm | 2 – 8 |
| Clearance between the valve cap and the turbine chamber | 2 mm | 1 – 6 |
| Round neck joining the valve to the chamber | 20 mm | 14 – 26 |
| Valve plug diameter | 15.6 mm | 14 – 18 |
| Plug-to-body clearance (diametral) | 0.3 mm | 0.15 – 0.6 |
| Plug cross-hole diameter | 6.6 mm | 5 – 8 |
| Brass stem diameter | 8 mm | 8 – 8 |
| Stem hole oversize | 0.2 mm | 0.1 – 0.5 |
| Brass pin diameter (1 mm rod) | 1 mm | 1 – 1 |
| Stem O-ring inner diameter (optional, 7 x 1.5) | 7 mm | 6 – 8 |
| Stem O-ring cross-section | 1.5 mm | 1 – 2 |
| Valve cap thickness | 5 mm | 4 – 8 |
| Valve handle length | 46 mm | 30 – 70 |
| Hose thread major diameter (3/4 GHT = 26.99, printed slightly under) | 26.6 mm | 26 – 27 |
| Hose thread pitch (11.5 TPI) | 2.21 mm | 2.209 – 2.209 |
| Hose thread depth | 1.35 mm | 1.1 – 1.5 |
| Threaded length | 16 mm | 12 – 20 |
| Hole for M3 heat-set insert | 4.2 mm | 3.8 – 4.6 |
| Insert length (hole depth) | 5.7 mm | 4 – 8 |
| Extra depth below insert | 2.5 mm | 0.5 – 4 |
| M3 clearance hole | 3.5 mm | 3.2 – 3.8 |
| Bolt head counterbore diameter | 6.4 mm | 5.5 – 8 |
| Bolt head counterbore depth | 3.2 mm | 2.5 – 3.5 |
| Gear cover plate thickness | 5 mm | 4.5 – 8 |
| Cover bearing lip thickness | 1.5 mm | 1 – 3 |
| Wall around cover bearing bosses | 2.5 mm | 2 – 4 |
| Angle of the two pinion-end cover ears around the pinion axis | 40 deg | 20 – 46 |
| Outer top-edge rounding | 1.5 mm | 0.5 – 3 |
| Ear blend radius (where ears meet the outline) | 3 mm | 1 – 5 |
| Bottom-edge chamfer (stops elephant foot) | 0.8 mm | 0.4 – 1.5 |
| Lead-in chamfer on bearing pockets and insert holes | 0.5 mm | 0.3 – 1 |
| Chamber bolt-ear centre outside the chamber wall | 0.5 mm | 0 – 3 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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