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.

You will need

You 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.
HDD sander with speed adjustment
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.
HDD sander with speed control
To control the controller, you need a speed controller,It looks like this:
Grinder from HDD with adjustment of turns

We assemble the grinding machine from hard disk

So, 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.
Grinding machine from HDD with adjustment of turns
In general, we unwind everything: from the top and from the bottom, since we will not need anything except the installed motor.
Grinding machine from HDD with speed adjustment
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.
HDD sander with speed control
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.
HDD sander with adjustablerevolutions
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.
 HDD sander with speed control
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).  HDD sander with speed control
With the same jumper, fix the controller itself from the side rotating disk.
HDD sander with speed control
To cut a circle out of emery paper, remove the disc itself from the HDD motor. Attach it to the emery paper, draw a pencil from the back and cut it out with ordinary scissors. It's time to glue the cut out circle onto a metal disk. Glue it all on double-sided tape. Your circle will not go anywhere, and changing it with wear will be easy.
HDD sander with speed control
Screw the disc in. From the cover we make a protective cover for the controller. We cut out a semicircle with a Dremel. "style =" max- width: 100%; " alt="Grinding machine from HDD with speed control"> And from a piece of tin we make a protective casing, so that the wear products do not fly to the controller. The tin strip is soldered to the hard drive cover.
Grinding machine from HDD with adjustment of turns
We collect everything. Connect the speed controller. The connection is made using a male connector. These two modules are specially created for each other and are actively used in modeling.
HDD sander with speed control
We connect the power to 12 V. The knob of the regulator adjusts the rotation speed of the disc. Everything should work without setting. HDD sander with speed control With the help of a PWM regulator, the speed is adjusted very smoothly and within great limits. Now you can grind even metal, even plastic.Such a useful design will surely be used in your home.

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