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Dimensions and CAD

The board is 39 × 39 mm with the four mounting holes on the NEMA 17 pattern (31 mm apart), so it bolts to the back of a NEMA 17 motor with the motor's own screws and a spacer. The encoder chip is exactly in the middle of the board, on the motor shaft's axis.

Drag to turn the board, scroll to zoom. The model is the board's STEP file from the repository, the PCB and everything mounted on it.

Board dimensions and hole pattern. The drawing is of the Spectral Micro, which has the same outline and hole pattern. Board dimensions and hole pattern. The drawing is of the Spectral Micro, which has the same outline and hole pattern.
Figure 3.2: Board dimensions and hole pattern. The drawing is of the Spectral Micro, which has the same outline and hole pattern.
The STEP model.
Figure 3.3: The STEP model.

The STEP files of the board, the magnet spacers for different motor lengths and the tool for pressing the magnet onto the shaft are in the firmware repository:

Downloads and files lists everything that can be downloaded.

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