Gears and transmission
Paper Length Measurement Roller Assembly
- Bounding box
- 180.0 × 200.0 × 82.0 mm
- Engine
- Precision B-rep
- Parameters
- 30
- Published
- October 3, 2026
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The prompt
Create a detailed 3D mechanical CAD assembly of a paper length measurement mechanism for an industrial paper-handling machine. The mechanism consists of: * **Measuring roller:** A horizontal cylindrical roller that makes contact with the moving paper to measure its displacement through rotation. * **Rotating shaft:** A horizontal shaft passing through the center of the measuring roller. The roller and shaft rotate together. * **Diametrically magnetized cylindrical magnet:** A small cylindrical magnet mounted on the same shaft, positioned beside the measuring roller, with its axis of rotation aligned with the shaft. The magnet must be diametrically magnetized, with north and south poles on opposite sides of its cylindrical surface. * **Hall-effect magnetic angle sensor:** A stationary sensor mounted very close to the magnet, with its sensing face directed toward the magnet. The sensor detects the rotating magnetic field to measure the shaft's angular displacement. * **Vertical support structure:** Two side supports holding the shaft and allowing the measuring roller assembly to move vertically. * **Spring-loaded mechanism:** A simple vertical spring system that pushes the measuring roller downward against the paper, maintaining contact while allowing the assembly to move up and down. * **Paper path:** A flat horizontal surface beneath the measuring roller representing the moving paper or conveyor. The roller must be positioned so that its cylindrical axis is horizontal and perpendicular to the paper's direction of travel. The magnet must be mounted on the same rotating shaft, outside the roller, and close to the Hall-effect sensor without touching it. Create a mechanically coherent assembly with clearly separated and correctly aligned components. Use realistic mechanical proportions, but keep dimensions adjustable because the final machine dimensions have not yet been determined. Show the entire assembly in an isometric view, with the magnet, sensor, shaft, roller, spring and supports clearly visible. Use separate solid bodies for the different components. Prioritize functional geometry and correct positioning over decorative details. Do not add motors, gears, electronic circuit boards, extra rollers or unrelated machinery.
Parameters
| Name | Value | Range |
|---|---|---|
| Roller Diameter | 50 mm | 20 – 200 |
| Roller Length | 60 mm | 10 – 200 |
| Shaft Diameter | 10 mm | 4 – 40 |
| Shaft Length | 180 mm | 60 – 400 |
| Shaft Axis Height (Z) | 25 mm | 10 – 200 |
| Magnet Diameter | 12 mm | 6 – 40 |
| Magnet Thickness | 8 mm | 2 – 40 |
| Magnet Centre X | 50 mm | 10 – 150 |
| Sensor Width (X) | 5 mm | 2 – 30 |
| Sensor Height (Z) | 4 mm | 2 – 30 |
| Sensor Thickness (Y) | 1.5 mm | 0.6 – 10 |
| Sensor Air Gap | 1 mm | 0.2 – 5 |
| Sensor Centre X | 50 mm | 10 – 150 |
| Support Offset X | 70 mm | 30 – 200 |
| Support Thickness (X) | 20 mm | 10 – 60 |
| Support Depth (Y) | 40 mm | 15 – 120 |
| Support Height (Z) | 80 mm | 40 – 200 |
| Guide Slot Clearance | 1 mm | 0.2 – 5 |
| Slot Below Axis | 15 mm | 5 – 60 |
| Slot Above Axis | 35 mm | 10 – 120 |
| Bearing Block Length (X) | 20 mm | 8 – 80 |
| Bearing Block Width (Y) | 20 mm | 8 – 80 |
| Bearing Block Height (Z) | 15 mm | 6 – 60 |
| Spring Outer Diameter | 10 mm | 4 – 40 |
| Spring Wire Diameter | 1 mm | 0.3 – 6 |
| Spring Free Length | 40 mm | 10 – 200 |
| Spring Coil Count | 20 coils | 4 – 60 |
| Paper Path Width (X) | 120 mm | 40 – 400 |
| Paper Path Length (Y) | 200 mm | 40 – 600 |
| Paper Path Thickness | 2 mm | 0.5 – 20 |
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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