AI CAD prompt: Twin-rod accessory carriage

Create a new owned Nora3D part document. Use millimeters, world XY as the base and +Z as height. Retain named native features and expose only the controls listed below.

1. Create **Core**, a 100 × 68 × 26 box, centered at X=0, Y=0, with its bottom at Z=0.
2. Create **Front rail**, a 100 × 8 × 4 box, centered at X=0, Y=-30, with its bottom at Z=26.
3. Create **Rear rail**, a 100 × 8 × 4 box, centered at X=0, Y=30, with its bottom at Z=26.
4. Unite **Core**, **Front rail**, **Rear rail** as **Carriage blank**. Require one connected result.
5. Create **Left rod**, radius 6.2, height 74, initially along +Z, with its base center at (-32, -37, 16).
6. Rotate the current **Left rod** solid -90 degrees around world X through [-32, -37, 16]. Resolve the actual current entity ID before the operation.
7. Create **Right rod**, radius 6.2, height 74, initially along +Z, with its base center at (32, -37, 16).
8. Rotate the current **Right rod** solid -90 degrees around world X through [32, -37, 16]. Resolve the actual current entity ID before the operation.
9. Create **Belt channel**, a 10 × 74 × 5 box, centered at X=0, Y=0, with its bottom at Z=3.
10. Create **Bolt -22 -21**, radius 2.6, height 34, initially along +Z, with its base center at (-22, -21, -1).
11. Create **Counterbore -22 -21**, radius 4.5, height 6, initially along +Z, with its base center at (-22, -21, 22).
12. Create **Bolt -22 21**, radius 2.6, height 34, initially along +Z, with its base center at (-22, 21, -1).
13. Create **Counterbore -22 21**, radius 4.5, height 6, initially along +Z, with its base center at (-22, 21, 22).
14. Create **Bolt 22 -21**, radius 2.6, height 34, initially along +Z, with its base center at (22, -21, -1).
15. Create **Counterbore 22 -21**, radius 4.5, height 6, initially along +Z, with its base center at (22, -21, 22).
16. Create **Bolt 22 21**, radius 2.6, height 34, initially along +Z, with its base center at (22, 21, -1).
17. Create **Counterbore 22 21**, radius 4.5, height 6, initially along +Z, with its base center at (22, 21, 22).
18. Subtract **Left rod**, **Right rod**, **Belt channel**, **Bolt -22 -21**, **Counterbore -22 -21**, **Bolt -22 21**, **Counterbore -22 21**, **Bolt 22 -21**, **Counterbore 22 -21**, **Bolt 22 21**, **Counterbore 22 21** from **Carriage blank**, consuming the tools; name the result **Rod carriage**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Left rod bore radius | 6.2 | 6–7 | 0.1 | Radius including the intended sliding allowance. |
| Right rod bore radius | 6.2 | 6–7 | 0.1 | Radius including the intended sliding allowance. |
| Belt passage width | 10 | 8–16 | 1 | Width of the central belt passage. |

All unlisted dimensions, topology and feature order remain fixed. Radius controls are radii, not diameters. These are independent numeric ranges; do not introduce unsupported formula bindings or assume a fit standard from an example value.