Gears and transmission
Welding Carriage Assembly (Exploded, 12 Parts)
- Bounding box
- 4885.0 × 270.0 × 77.5 mm
- Engine
- Precision B-rep
- Parameters
- 54
- Published
- October 9, 2026
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The prompt
Design a 3D CAD model of a low-cost welding carriage (like Steelmax Rail Runner Gen III), as a full assembly with every part modeled separately. Specs: - Body approx 350 x 270 x 75 mm, aluminum 6061 plate, total weight 13-20 kg - Drive: NEMA 23 stepper + 10:1 planetary + 2:1 spur gear (20:1 total), steel pinion (module 1.5, 14 teeth) meshing with a rack - Pulling force 400 N, speed 0-250 cm/min - 4 V-groove guide rollers (2 fixed, 2 spring-loaded eccentric) to ride on the rail - Drive clutch knob to disengage the pinion, with adjustable backlash - Limit switch, 2 carry handles, rod holder for a torch (16-22 mm) with clamp - Motor driver box and control panel on top Output: exploded view, part list with material and dimensions, assembly steps, STEP files, and a list of parts to buy vs. manufacture.
Parameters
| Name | Value | Range |
|---|---|---|
| Chassis Width (X) | 350 mm | 200 – 500 |
| Chassis Depth (Y) | 270 mm | 150 – 450 |
| Chassis Height (Z) | 75 mm | 40 – 150 |
| Top Pocket Depth | 30 mm | 0 – 60 |
| Corner Bolt Hole Dia | 9 mm | 3 – 20 |
| Motor Frame Size | 57 mm | 40 – 80 |
| Motor Body Length | 76 mm | 40 – 150 |
| Motor Shaft Dia | 8 mm | 4 – 16 |
| Motor Shaft Length | 25 mm | 10 – 60 |
| Gearbox Body Dia | 60 mm | 40 – 100 |
| Gearbox Body Length | 80 mm | 40 – 150 |
| Output Shaft Dia | 12 mm | 6 – 25 |
| Output Shaft Length | 30 mm | 10 – 80 |
| Gear Module | 1.5 mm | 0.5 – 4 |
| Pinion Gear Teeth (30 mm PCD) | 20 teeth | 10 – 60 |
| Wheel Gear Teeth (60 mm PCD) | 40 teeth | 15 – 100 |
| Gear Face Width | 12 mm | 5 – 30 |
| Small Gear Bore | 10 mm | 4 – 30 |
| Large Gear Bore | 12 mm | 4 – 40 |
| Gear Centre Distance | 45 mm | 10 – 150 |
| Drive Pinion Teeth | 14 teeth | 8 – 30 |
| Pinion Face Width | 15 mm | 5 – 30 |
| Pinion Bore | 10 mm | 4 – 25 |
| Rack Length | 300 mm | 100 – 800 |
| Rack Width | 20 mm | 10 – 40 |
| Rack Height | 20 mm | 10 – 40 |
| Rack Tooth Depth | 3.4 mm | 1 – 6 |
| Roller Outer Dia | 40 mm | 20 – 80 |
| Roller Width | 20 mm | 10 – 40 |
| Roller Bearing Bore | 12 mm | 4 – 30 |
| V-Groove Depth | 3 mm | 0.5 – 8 |
| Roller Corner Spacing | 100 mm | 50 – 250 |
| Clutch Knob Dia | 40 mm | 20 – 80 |
| Clutch Knob Height | 12 mm | 5 – 40 |
| Knob Shaft Dia | 20 mm | 8 – 40 |
| Knob Shaft Length | 25 mm | 10 – 80 |
| Switch Body Length | 30 mm | 15 – 60 |
| Switch Body Width | 20 mm | 10 – 50 |
| Switch Body Height | 10 mm | 5 – 30 |
| Handle Grip Dia | 25 mm | 12 – 40 |
| Handle Length | 120 mm | 60 – 250 |
| Mounting Boss Dia | 20 mm | 8 – 40 |
| Mounting Boss Height | 25 mm | 10 – 60 |
| Handle-to-Handle Spacing | 80 mm | 30 – 200 |
| Rod Holder Length | 80 mm | 40 – 150 |
| Rod Holder Depth | 50 mm | 30 – 120 |
| Rod Holder Height | 40 mm | 20 – 100 |
| Torch Rod Bore | 22 mm | 16 – 30 |
| Clamp Screw Hole Dia | 6 mm | 3 – 12 |
| Control Box Length | 180 mm | 80 – 300 |
| Control Box Width | 120 mm | 60 – 250 |
| Control Box Height | 60 mm | 30 – 150 |
| E-Stop Button Dia | 22 mm | 10 – 40 |
| Exploded Layout Gap (X) | 420 mm | 50 – 900 |
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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