#video on salvaging the mirror #brushless motor from a laser printer. #hoarding by #Zafer-Yildiz. I expect disappointment from watching a video of his previously. Jesus fuck, he’s touching the first-surface mirrors with his fingers. Which are dirty. ALL OF THEM. Good tip on identifying power rails from the polarization of a smoothing cap. By grounding different signal lines on the connector through a 1kΩ resistor he gets it to spin up! But shows no waveforms. He gets it to spin faster by overvolting it (initially 12V from his lab supply.) By feeding in a varying-frequency sine wave on a control pin he also gets different speeds. Not that bad a video for 5 minutes I guess.
on 02024-06-08build a drone engine from an old hard drive #video #hoarding a two-platter 120GB 7200 rpm Seagate Barracuda specifically. By #Zafer-Yildiz. Normally I’d assume the spindle motor was too low-powered to be useful this way, since they consume about a watt in normal operation, and quadcopters usually use several hundred watts per motor. He solders a “Simonk30A” ESC to the spindle motor and attaches the rotor from a computer cooling fan, which was unsurprisingly also a #brushless motor, with a bit of gelling superglue. He supplies the ESC with 12 volts, which is probably what the motor originally used. Even before he adds reflective tape to one of the fan blades, it seems to be poorly balanced and has a lot of vibration, which is probably not what the motor’s precision bearings are optimized for. Apparently he’s driving the fan at 6600–7900rpm. No force measurements, no temperature measurements, no power measurements, nothing. Zafer, I am disappoint.
on 02024-04-06