| Motor part |  |
The motor is a small 12 V DC motor, powered with a regulated powr supply. The idea is to keep the voltage and thus torque low, so the motor can easily be halted without breaking the wire. |
| Coupler part |  |
Most 3D-printed parts are printed with ASA, but PETG would probably also work. The coupler should reduce vibrations due to mis-alignment between motor and axis. Further reduction is achieved by thin rubber sheet between coupler parts. Bycicle inner tire has the proper thickness. The axis mount has a 5x16x5 mm bearing. The axis is M5 metric thread. |
| Sensor part |  |
The sensor is the standard KY-003 breakout board. It has a nice LED indicator to help tuning the sensor-magnet distance. The magnet is a 6x2 mm neodymium magnet glued to a 3D-printed nut. Mark the proper magnetic polarity before applying the glue. The sensor board mount has an option for adustments. |
| Spool part |  |
The spool mount is kept a generic as possible to accomodate a range of spool holders. Adapters can be used to hold larger diameter spool holders. |
| Counter part |   |
The board is a simple design just to connect the parts. The Arduino is the stock Nano. The display is a Common-Anode 4-digit display with 14 mm high digits. The board just fits in the housing designed to mimic the dimensions of the "XY-SK35 DC DC Buck Boost Converter" and similar panel mounted modules. The case is my design for a table-top case for these modules. The sketch/ |
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Last update: 2024-12-05