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On the topic of components, according to ProShorts101, the following list of bits and pieces is required to transmogrify your HDD into a disc sander: an old HDD, a 30A Drone ESC, a servo tester, a 12V socket, and some sand paper.
HDD disc sander maker method
Start by disassembling the HDD, which means taking off the metal lid, removing the platter read heads and supporting assembly, and the drive controller PCB from the other side. Next, solder the ESC to the drive power pads, as shown in the video. You will then thread the ESC’s cables to the front of the disc sander project. Wire up the 12V power socket and variable speed-enabling potentiometer circuit as shown.
For a clean build, ProShorts101 drilled cable routing holes, and cut and repurposed the metal lid so that only the spinning disc was exposed. This reworked lid helped secure the power socket and variable speed knob. Last but not least, it was time to cut out and mount the chosen abrasive to the spinning disc surface. ProShorts101 used lots of glue and a rough looking piece of what looked like aluminum oxide paper.
Some video viewers suggested a project-improving tweak where a Velcro surface could be added to the HDD disc, meaning a user could renew or switch sandpaper grades and types more easily.
Finally, this upcycled HDD disc sanding tool will probably not be a serious rival to even the most budget-conscious devices available at retail. Nevertheless, it might be adequate for smaller scale tasks like sharpening nail scissors or reshaping small wooden spatulas.
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