Connectors & Adapters · Free generator

Keyed four-arm drive hub

A four-arm hub with raised center, shaft keyway, radial set-screw passage and slotted arm connections.

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Edit the design. Export CAD.

Choose Continue editing in Nora3D inside the generator to keep your dimensions in an editable copy. Change features and export STEP CAD files.

Before you print

Four arms span 110 mm; each arm is 22 mm wide and 8 mm thick. Hub diameter 36, total height 28. Keyway is 4 mm wide and extends to Y=9.5. Separate metal fasteners required; no drive-torque rating. Geometry has been digitally checked; this template has not been physically test-printed.

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AI CAD prompt

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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 **Horizontal arm**, a 110 × 22 × 8 box, centered at X=0, Y=0, with its bottom at Z=0.
2. Create **Vertical arm**, a 22 × 110 × 8 box, centered at X=0, Y=0, with its bottom at Z=0.
3. Create **Hub**, radius 18, height 28, initially along +Z, with its base center at (0, 0, 0).
4. Unite **Horizontal arm**, **Vertical arm**, **Hub** as **Cross blank**. Require one connected result.
5. Create **Shaft**, radius 6, height 32, initially along +Z, with its base center at (0, 0, -1).
6. Create **Keyway**, a 4 × 5.5 × 32 box, centered at X=0, Y=6.75, with its bottom at Z=-1.
7. Create **Set screw**, radius 1.7, height 18, initially along +Z, with its base center at (5, 0, 19).
8. Rotate the current **Set screw** solid 90 degrees around world Y through [5, 0, 19]. Resolve the actual current entity ID before the operation.
9. Create **Horizontal slot -40**, a 18 × 6 × 12 box, centered at X=-40, Y=0, with its bottom at Z=-1.
10. Create **Horizontal slot 40**, a 18 × 6 × 12 box, centered at X=40, Y=0, with its bottom at Z=-1.
11. Create **Vertical slot -40**, a 6 × 18 × 12 box, centered at X=0, Y=-40, with its bottom at Z=-1.
12. Create **Vertical slot 40**, a 6 × 18 × 12 box, centered at X=0, Y=40, with its bottom at Z=-1.
13. Subtract **Shaft**, **Keyway**, **Set screw**, **Horizontal slot -40**, **Horizontal slot 40**, **Vertical slot -40**, **Vertical slot 40** from **Cross blank**, consuming the tools; name the result **Keyed cross hub**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Left arm slot length | 18 | 12–22 | 1 | Adjustment length on the left arm. |
| Right arm slot length | 18 | 12–22 | 1 | Adjustment length on the right arm. |
| Top arm slot length | 18 | 12–22 | 1 | Adjustment length on the top arm. |

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.

Adjustable dimensions

Parameter	Default	Range	Step
Left arm slot length	18 mm	12–22 mm	1 mm
Right arm slot length	18 mm	12–22 mm	1 mm
Top arm slot length	18 mm	12–22 mm	1 mm