Gears and transmission
Stage D Drive and Timing Assembly
- Bounding box
- 127.5 × 96.0 × 142.5 mm
- Engine
- Precision B-rep
- Parameters
- 49
- Published
- October 20, 2026
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The prompt
STAGE D: drive and timing. In the rear box: a spring barrel, 40 diameter x 15 wide, with a three-stage gear train down to the camshaft and a small fly governor wheel, 30 diameter, on the fast shaft. Add a sear lever and a striker lever that lifts the catch from Stage C. Clock module: an 8-day clock movement, about 70 x 70 x 30 mm, with a 24-hour day disc, 60 mm diameter, turning once a day. The disc has four concentric rings with 1, 2, 4 and 8 notches, each notch 5 degrees wide. Add a pivoting feeler arm with a slider bead and a spring-loaded feeler pin that rides on the disc. Add a side lever that pushes the sear.
Parameters
| Name | Value | Range |
|---|---|---|
| Rear Drive Box Length | 120 mm | 80 – 200 |
| Rear Drive Box Width | 90 mm | 60 – 150 |
| Rear Drive Box Height | 50 mm | 30 – 100 |
| Housing Wall Thickness | 3 mm | 1 – 6 |
| Spring Barrel Diameter | 40 mm | 20 – 60 |
| Spring Barrel Width | 15 mm | 5 – 30 |
| Gear Module | 1.5 mm | 0.5 – 3 |
| Gear Face Width | 8 mm | 2 – 20 |
| Gear Shaft Diameter | 4 mm | 2 – 10 |
| Stage 1 Gear Teeth | 40 | 20 – 60 |
| Stage 1 Pinion Teeth | 12 | 8 – 30 |
| Stage 2 Gear Teeth | 36 | 20 – 60 |
| Stage 2 Pinion Teeth | 12 | 8 – 30 |
| Stage 3 Gear Teeth | 30 | 20 – 60 |
| Stage 3 Pinion Teeth | 10 | 8 – 20 |
| Camshaft Diameter | 6 mm | 3 – 12 |
| Camshaft Length | 80 mm | 40 – 120 |
| Cam Lobe Diameter | 10 mm | 6 – 16 |
| Cam Lobe Width | 4 mm | 2 – 8 |
| Cam Lobe Lift Offset | 4 mm | 1 – 6 |
| Fly Governor Wheel Diameter | 30 mm | 15 – 50 |
| Fly Governor Wheel Thickness | 5 mm | 2 – 10 |
| Fly Governor Bore Diameter | 4 mm | 2 – 10 |
| Sear/Striker Lever Width | 8 mm | 4 – 16 |
| Sear/Striker Lever Thickness | 3 mm | 1 – 6 |
| Lever Pivot Hole Diameter | 3 mm | 1 – 6 |
| Sear Lever Length | 35 mm | 20 – 50 |
| Striker Lever Length | 40 mm | 20 – 60 |
| Clock Movement Length | 70 mm | 40 – 100 |
| Clock Movement Width | 70 mm | 40 – 100 |
| Clock Movement Height | 30 mm | 15 – 50 |
| 24-Hour Day Disc Diameter | 60 mm | 30 – 100 |
| Day Disc Thickness | 2 mm | 1 – 5 |
| Notch Angular Width | 5 deg | 2 – 10 |
| Notch Radial Length | 3 mm | 1 – 8 |
| Notch Cut Depth | 1 mm | 0.5 – 2 |
| Ring 1 Radius (1 Notch) | 10 mm | 5 – 28 |
| Ring 2 Radius (2 Notches) | 15 mm | 6 – 28 |
| Ring 3 Radius (4 Notches) | 20 mm | 10 – 29 |
| Ring 4 Radius (8 Notches) | 25 mm | 12 – 29.5 |
| Feeler Arm Length | 50 mm | 30 – 80 |
| Feeler Arm Width | 6 mm | 3 – 12 |
| Feeler Arm Thickness | 3 mm | 1 – 6 |
| Feeler Pivot Hole Diameter | 3 mm | 1 – 6 |
| Feeler Pin Diameter | 2 mm | 1 – 4 |
| Feeler Pin Length | 8 mm | 3 – 15 |
| Side Lever Length | 45 mm | 25 – 70 |
| Side Lever Width | 6 mm | 3 – 12 |
| Side Lever Thickness | 3 mm | 1 – 6 |
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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