SHARPENING MACHINE
FROM HARD DISK
For dressing small tools, drills and various parts, it is convenient to use a small emery that can be held in your hand. A variant of this design is shown in Fig. 1:
Rice. 1
It is desirable to take a hard disk "from an earlier time", with a capacity of about 1 GB. It has more solid magnetic pancakes. The disk must be disassembled:
Remove the top cover;
Remove the magnets and the head drive;
Excessive leads are removed, only the motor power remains.
Further, for testing, the standard power supply + 5V, + 12V is supplied to the disk. The author used an ordinary AT format power supply. As a rule, at this time a pleasant surprise is found: in the absence of heads, the disk stops rotating after a few seconds.
You can deal with this phenomenon in different ways:
Assemble a separate generator to power the engine;
Use short-term automatic interruption of the supply voltage;
When disassembling the disk, try not to remove all the heads (leave the lower one);
Correct the existing motor power supply circuit.
Rice. 2
Unfortunately, it is impossible to give a rigorous method of searching for characteristic points. If you can get a schematic diagram, then a lot of questions will disappear by themselves. The author was looking for the classic poke method. The general gist is this:
The microcircuit is determined - the motor driver;
With the help of an oscilloscope, the signal levels at its outputs are examined before and after stopping;
Signals similar to control signals are identified and examined.
The task is to block the signal (s) that cause the engine to stop. In the author's case, it turned out to be enough to evaporate a couple of transistors:
Rice.3
After long-term rotation is ensured, you can cut a ring of the desired size from a sheet of abrasive paper. The ring is glued to the upper disc with a few drops of glue around the circumference. The author used Moment glue.
When sharpening the tool, be sure to take into account the direction of rotation of the disc and place the tool blade in the direction of rotation. Otherwise, scuffing of the skin cloth is inevitable, which can be fraught with injuries.
Files for the article
Any hard drive sooner or later fails, but this is not a reason to throw it away, it can still come in handy. For example, you can make a useful thing in the household from it - a sharpening or grinding machine. This will require the hard drive itself, computer unit power supply, power connector and sandpaper. In addition, you need a Torx screwdriver, with which you can disassemble the hard drive, scissors, soldering iron and wires.
A 3.5-inch hard drive or a 2.5-inch one will do, but the rpm and pancake size of a laptop hard drive is smaller, so it is less efficient. But it is powered by 5 volts, so it can be run from USB, including using a portable charger.
Disassemble the hard drive and remove the pancakes from it. Keep in mind that one or more screws are usually hidden under the sticker - if you don't find and unscrew them, you won't be able to remove the cover. Remove all unnecessary components (reader, etc.), leaving only the logic board, motor and spindle. Do not throw out the pancakes, you will need them. Place one pancake on sandpaper, trace around it, and cut a circle out of the paper with a hole in the middle.
Glue the emery wheel onto the pancake. Use a glue that comes off easily so that you can replace the sandpaper as it wears out. Attach the pancake back to the spindle and secure it with the ring and bolts. Supply power to the hard drive from the PSU.
When the circle starts to rotate, you can start working: sharpen knives, grind bolts, grind something, and so on.
Usually there are several pancakes in hard drives, so you can stick on one coarse sandpaper for rough work, and on the other fine one for more delicate work. Of course, such a sander is unlikely to be useful for serious work, but you can use it anywhere, powered by a 12-volt battery.
Hello everyone! The idea itself is not new. They say the internet is full of such records, I have not seen it yet, the idea appeared on its own. I was impatient here, you know, to urgently sharpen a knife and a screwdriver ... But "OH GOD!" Emery is in the garage, but at work there is not even a file ... Well, we are “sysadmins”, the people are simple and I got into the “bins of the Motherland” and got it out ... Old hard disk from PC ...
We take scissors, screwdrivers, sandpaper, our hdd and double-sided tape
Everything we need.
We unscrew the bolts. 7 bolts are always hidden under the sticker.
……………………………………………………………….
We open it. and everything is so beautifully packed there. glitters.
We turn off the actuator and the lever for moving the heads, Magnets for experiments, the rest can be scrapped.
Unscrew the disc mounting cover and remove the washer above the disc, as well as the disc itself
We put the disk on sandpaper, outline the contours and cut out
These are the bagels)
We glue double-sided tape to our disk (you can add it to glue, but it will be easier to replace the sandpaper with scotch tape)
……………………………………………………………………………………
ISKRIM))))
Well, about the work of this device.
It is better to take sandpaper with a small fraction, it is rather weak for a large engine. But I had enough to sharpen everything I needed, even very much. Bye everyone!
Hard disk emery personal computer you can edit and sharpen hand tools, knives or small parts. The main advantage of the device: a minimum amount of tools and auxiliary materials are required for its manufacture. At the same time, the performance of the hard drive does not play a special role: its functions will be completely different.
Modern hard drives computers are not very well suited for the implementation of the plan. The fact is that on the HDD of the first generations, the magnetic circles were distinguished by their large dimensions. This allows you to expand the range of processed items.
To assemble an emery machine, you must prepare the following materials:
- HDD;
- abrasive material;
- standard power supply;
- power supply connection kit;
- materials for the assembly of the protective casing (at the request of the master);
- rubber caps as a support for the future machine;
- controller for the drive.
The purchase of the latter item depends on the type of hard drive. We are considering a brushless drive application that will not function on standard AC or DC voltage. The controller is a special unit that generates a voltage of a special frequency for smooth operation electric motor... It operates from a voltage of 9-12 V based on the features specific model... The cost when ordering from China is $ 2.8–3.2.
The main advantage of the controller is the built-in function of manual adjustment of engine speed.
In the process of work, you will need the following tool:
- a set of screwdrivers for disassembling a hard drive;
- small drills;
- screwdriver;
- soldering iron;
- glue.
How to disassemble a hard drive
With the right tools, the disassembly process is a simple task.
The first step is to remove the top cover. Modern models are fastened with several hex head bolts. Older versions are designed to use the classic Phillips screwdriver. If during the entire period of operation the disk has never been disassembled, quite serious efforts will have to be made during the removal of the cover: at the factory, the screws are tightened with a high tightening torque.
The next stage is a complete disassembly of the hard drive. It includes the following steps:
- We dismantle the dust collector. It looks like a small detail in the image. white... Its function was to filter the incoming air from fines that could damage the hard drive.
- We remove the neodymium magnets and the electronic control board. Its performance does not matter: it will not be of value for the future electric emery. Exceptions will be discussed below.
- We remove the read head and all leads except for the power supply.
After carrying out the work, a bare body with a drive and discs should remain.
Assembling mini emery from a hard drive
After preparing the necessary tools and materials, you can start assembling the electric sharpener from the hard drive.
The process begins with the preparation of the abrasive surface. There are two options:
- The nozzle is cut from the sheet along the contour of the disc. An additional hole is made in the center.
- In a hardware store, you can purchase a set of abrasive wheels for a grinder and bring their size to the specified parameters.
The wheels themselves can be made of aluminum alloy or glass. We recommend gluing the discs on all sides to obtain a larger number of processing surfaces. This will increase the interval for their replacement. Use different grit abrasives to expand your machining capabilities. By purchasing sandpaper with a margin, you can make removable nozzles from the remaining material.
Any all-purpose adhesive can be used to attach the attachment to the disc.
After preparing the disks, they are installed back to their original place, tightening all the screws.
Then you should start making a case for the controller. The easiest option is to buy a junction box with dimensions of 100 * 100. These dimensions are sufficient to comfortably accommodate the controller, power socket and engine speed control mechanism. Lovers modern technologies can independently design the case and print it on a 3D printer. It is attached to the hard drive with standard bolts.
The last step is to install rubber feet, which will dampen vibration and provide additional stability during operation. You can order them on Aliexpress or make them yourself.
Power connection
There are several options for supplying power to the machine:
- Use a standard PC power supply of a suitable format.
- Disassemble an unnecessary power supply unit for any household appliance that operates with a voltage of 12 volts. The board is withdrawn from it and built into the existing one. electrical circuit machine by soldering electrical wires. Do not forget about installing the standard power supply socket into the machine body.
After that, you can start testing the invention. Please note: the direction of movement of the actuator can be reversed using a switch on the controller.
It is impossible to machine massive tools with this machine. The reason lies in the low power of the classic motor: it runs on ferrite magnets, which have never been particularly powerful.
Magnets made on the basis of rare earth elements are installed in powerful drives.
An alternative option is to replace the existing winding with wires with a large cross-section. This will increase the amperage.
Many inventors who do not use a controller in their design are faced with the following problem: after power is applied, the rotation stops after 10-15 seconds. The reason is the lack of heads. There are several ways to solve this problem:
- Leave the lower head when disassembling.
- Make a separate power supply for the drive.
- Correct the existing wiring diagram.
Subject to availability schematic diagram the latter option seems to be the most preferable. The task of the master is to block the signals that lead to the engine stop. As a rule, it is enough to remove a few transistors for this.
Hard disk emery is a handy homemade product that can be used to process small tools and household appliances. What do you think about engine power? Perhaps, to increase productivity, it is advisable to use a motor made of aircraft toys? Share your thoughts in the comments.