HDD sander with speed control
Surely, most people have old hard drives in their bins. You can make a necessary and useful thing from it for sharpening knives, scalpels and other objects - a miniature grinding machine with a wheel rotation speed regulator.Motor in HDD is three-phase, brushless and very powerful. It will simply not work like this from DC and in order to start it you will need a controller or a three-phase motor control driver.To control the controller, you need a speed controller,It looks like this:In general, we unwind everything: from the top and from the bottom, since we will not need anything except the installed motor.Remove the board, leaving only the contacts of the connection to the motor. Now look: the motors in hard drives can have either three outputs or four.All the envy of the method of turning on the windings. Somewhere they are included under the "star" scheme, and somewhere according to the "triangle" scheme. Both options are suitable for us.Except that the three-pin HDD is clear with the phases -" ABC ", and the four-pin HD will have to look for the phases using a tester. We will not need the middle or common wire - it will not be used.Connect the wires to the engine from the controller, isolate and fix it with a metal jumper (you can cut it from a tin can).With the same jumper, fix the controller itself from the side rotating disk.
You will needYou will also need wires and cams for insulation and a few more trifles. The three main components are: A hard disk in any state. The engine in it is difficult to burn, so it is 100% suitable. And we will have a purchase with a control driver.
We assemble the grinding machine from hard diskSo, we open the hard disk. Here you have a problem - you will need specialized screwdrivers, as there are non-standard bolts and screws. I advise you not to suffer and buy, or rent, a set with such screwdrivers.
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