Gears and transmission
Concrete Mixer 6:1 Hand-Cranked Cam-Ratchet Gearbox Assembly
- Bounding box
- 1961.3 × 160.0 × 165.0 mm
- Engine
- Precision B-rep
- Parameters
- 74
- Published
- November 9, 2026
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The prompt
Design a complete 3D mechanical drive mechanism for my university concrete mixer coursework. This must be a mechanical assembly with separate parts, not just one solid object. The design must include: 1. V-shaped input handle: A V-shaped pull-down lever with two cylindrical hand grips, connected to the input mechanism. 2. V-belt pulley: A rotating pulley with a proper V-shaped belt groove around its circumference. Include a central 8 mm axle hole. The pulley should be mounted between two parallel 5 mm thick support plates, with the axle passing through both plates and the pulley. 3. Cylindrical cam: A cylindrical cam with a helical groove running around its outer surface. Include a matching follower that runs inside the groove and converts the lever movement into rotational movement. 4. Ratchet mechanism: Include a ratchet and pawl or one-way clutch so the input can drive the mechanism during the power stroke without reversing the output during the return stroke. 5. Two-stage spur gearbox: Include four meshing spur gears arranged on three parallel shafts: * First stage: 20-tooth driving gear meshing with a 60-tooth driven gear (3:1 reduction). * Second stage: 20-tooth driving gear on the intermediate shaft meshing with a 40-tooth output gear (2:1 reduction). * Use module 2 mm spur gears. * Total reduction ratio: 6:1. * Input speed: 60 rpm. * Output speed: 10 rpm. 6. Output shaft: Connect the gearbox output shaft to the concrete mixer drum drive. Include realistic shafts, bearing supports, mounting plates, spacers and fasteners. Align all shafts and gears correctly. Avoid gears intersecting or floating separately. Make the components proportionate and suitable for assembly. Use millimetres for all dimensions. Keep the parts separate and editable wherever possible. Export the complete assembly as a STEP (.STEP or .STP) file compatible with Autodesk Fusion 360.
Parameters
| Name | Value | Range |
|---|---|---|
| Lever arm length | 220 mm | 150 – 350 |
| Lever V span | 140 mm | 80 – 240 |
| Lever thickness | 12 mm | 6 – 25 |
| Lever arm width | 20 mm | 10 – 40 |
| Grip diameter | 20 mm | 12 – 35 |
| Grip length | 70 mm | 40 – 140 |
| Pivot boss diameter | 20 mm | 12 – 40 |
| Pivot bore | 8 mm | 4 – 16 |
| Pulley outer diameter | 80 mm | 40 – 160 |
| Pulley width | 22 mm | 10 – 50 |
| V-groove included angle | 38 deg | 20 – 60 |
| V-groove depth | 10 mm | 4 – 20 |
| Axle bore | 8 mm | 4 – 20 |
| Set-screw hole | 5 mm | 2.5 – 10 |
| Support plate length | 120 mm | 60 – 220 |
| Support plate height | 80 mm | 40 – 160 |
| Support plate thickness | 5 mm | 2 – 15 |
| Axle bore | 8 mm | 4 – 20 |
| Mounting hole | 6 mm | 3 – 12 |
| Mounting hole inset | 15 mm | 8 – 30 |
| Axle diameter | 8 mm | 4 – 20 |
| Axle length | 90 mm | 50 – 160 |
| Retaining shoulder dia | 12 mm | 6 – 24 |
| Retaining shoulder width | 3 mm | 1 – 8 |
| Cam diameter | 36 mm | 20 – 80 |
| Cam length | 55 mm | 20 – 120 |
| Shaft bore | 12 mm | 6 – 30 |
| Helical groove width | 6 mm | 3 – 14 |
| Helical groove depth | 4 mm | 1.5 – 10 |
| Helical groove turns | 1 rev | 0.5 – 2.5 |
| Keyway width | 4 mm | 2 – 12 |
| Roller diameter | 6 mm | 3 – 14 |
| Roller length | 18 mm | 8 – 40 |
| Pin diameter | 3 mm | 1.5 – 8 |
| Pin length | 26 mm | 12 – 60 |
| Bracket length | 20 mm | 10 – 50 |
| Bracket width | 12 mm | 6 – 30 |
| Bracket thickness | 5 mm | 2 – 15 |
| Ratchet outside diameter | 50 mm | 25 – 120 |
| Ratchet thickness | 10 mm | 4 – 25 |
| Ratchet tooth count | 12 teeth | 6 – 30 |
| Ratchet bore | 12 mm | 6 – 30 |
| Ratchet tooth depth | 3 mm | 1 – 10 |
| Pawl length | 25 mm | 12 – 60 |
| Pawl width | 10 mm | 4 – 25 |
| Pawl height | 6 mm | 2 – 16 |
| Pawl pivot pin | 3 mm | 1.5 – 10 |
| Gear module | 2 mm | 1 – 4 |
| Gear face width | 18 mm | 6 – 40 |
| Gear bore | 12 mm | 6 – 30 |
| Stage driver teeth | 20 teeth | 10 – 40 |
| Stage 1 driven teeth | 60 teeth | 30 – 120 |
| Stage 2 output teeth | 40 teeth | 20 – 100 |
| Shaft diameter | 12 mm | 6 – 30 |
| Input shaft length | 120 mm | 60 – 260 |
| Intermediate shaft length | 110 mm | 60 – 260 |
| Output shaft length | 130 mm | 60 – 300 |
| Bearing outside diameter | 22 mm | 14 – 50 |
| Bearing width | 7 mm | 3 – 20 |
| Gearbox plate length | 220 mm | 120 – 400 |
| Gearbox plate width | 140 mm | 80 – 300 |
| Gearbox plate thickness | 12 mm | 5 – 30 |
| Mounting bolt hole | 5 mm | 3 – 12 |
| Input-to-intermediate spacing | 80 mm | 40 – 160 |
| Intermediate-to-output spacing | 60 mm | 40 – 140 |
| Coupling hub diameter | 25 mm | 14 – 60 |
| Coupling hub length | 30 mm | 15 – 80 |
| Coupling bore | 12 mm | 6 – 30 |
| Clamping bolt hole | 6 mm | 3 – 14 |
| Bolt shank diameter | 5 mm | 3 – 12 |
| Bolt length | 20 mm | 8 – 60 |
| Head across-flats | 8 mm | 5 – 20 |
| Head height | 4 mm | 2 – 12 |
| Exploded layout gap | 30 mm | 5 – 120 |
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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