The chain of an electronic saw becomes dull sooner or later. Moreover, with intensive work, this most likely happens early. The subsequent sharpening of the chain is a rather lengthy and very tedious process. Fortunately, it can be accelerated and automated if you have a special tool at hand. A sharpening device is a simple thing, if you wish, you can do it yourself in a couple of minutes.
What you need: bearing, round file, round piece of wood, screwdriver
Actually, the most important thing in the working process is to have all of the above at hand on the farm. If there are materials and tools, then it will not be difficult to build a sharpening device. True, it is worth paying some attention to the little things, so that later, using the made device is easy, simple, and most importantly, convenient.
So, the first and most important thing is the bearing. You can take anyone, the main thing is to rotate. However, if you are not your own enemy, then it is best to choose one that fits comfortably in your hand. As you might guess, in the process of sharpening you still have to hold on to it.
The next moment is a piece of wood. It must be dry and sturdy. You need to choose one so that it fits tightly into the bearing bore. As soon as we drive the material inside, we cut the tree from both sides so that it does not protrude at all, filling the inner ring of the bearing.
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Now the most difficult thing is to find the center of the circle filled with a tree and mark it with a pencil and a ruler. At the found central point we drill a small hole, slightly smaller than the file. Moment of truth: during drilling, we check the bearing for rotation. It is very important that there is no runout, otherwise you will have to look for another bearing or change the piece of wood, since the center was found incorrectly.
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If everything is in perfect order, then we hammer the file into the tree with the sharp end. The tool is ready. Now it remains to insert the file into the screwdriver and you can sharpen the saw teeth. On average, one chain using such an accessory takes about 10 minutes.
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A source: https://novate.ru/blogs/200220/53505/