AI CAD prompt: T-slot fit carriage with relief channels

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 76 × 64 × 28 box, centered at X=0, Y=0, with its bottom at Z=0.
2. Create **Left mounting flange**, a 12 × 76 × 6 box, centered at X=-32, Y=0, with its bottom at Z=0.
3. Create **Right mounting flange**, a 12 × 76 × 6 box, centered at X=32, Y=0, with its bottom at Z=0.
4. Unite **Core**, **Left mounting flange**, **Right mounting flange** as **Carriage blank**. Require one connected result.
5. Create **Undercut**, a 18 × 80 × 8 box, centered at X=0, Y=0, with its bottom at Z=7.
6. Create **Neck**, a 10 × 80 × 18 box, centered at X=0, Y=0, with its bottom at Z=15.
7. Create **Bottom relief**, a 14 × 80 × 1 box, centered at X=0, Y=0, with its bottom at Z=0.
8. Create **Bolt -26 -21**, radius 2.6, height 32, initially along +Z, with its base center at (-26, -21, -1).
9. Create **Head -26 -21**, radius 4.5, height 4, initially along +Z, with its base center at (-26, -21, 24).
10. Create **Bolt -26 21**, radius 2.6, height 32, initially along +Z, with its base center at (-26, 21, -1).
11. Create **Head -26 21**, radius 4.5, height 4, initially along +Z, with its base center at (-26, 21, 24).
12. Create **Bolt 26 -21**, radius 2.6, height 32, initially along +Z, with its base center at (26, -21, -1).
13. Create **Head 26 -21**, radius 4.5, height 4, initially along +Z, with its base center at (26, -21, 24).
14. Create **Bolt 26 21**, radius 2.6, height 32, initially along +Z, with its base center at (26, 21, -1).
15. Create **Head 26 21**, radius 4.5, height 4, initially along +Z, with its base center at (26, 21, 24).
16. Subtract **Undercut**, **Neck**, **Bottom relief**, **Bolt -26 -21**, **Head -26 -21**, **Bolt -26 21**, **Head -26 21**, **Bolt 26 -21**, **Head 26 -21**, **Bolt 26 21**, **Head 26 21** from **Carriage blank**, consuming the tools; name the result **T-slot carriage**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Undercut width | 18 | 17.6–19.2 | 0.1 | Width of the broad internal T channel. |
| Neck width | 10 | 9.8–11.2 | 0.1 | Width of the open neck. |
| Bottom relief depth | 1 | 0.6–1.6 | 0.1 | Relief depth below the main carriage; it does not change the T profile. |

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.