Basic rules for sharpening the chainsaw chain
To sharpen the chainsaw chain it is good to follow some basic rules: in this way you will have better results in greater safety. First, check that the voltage is adequate. In fact, most problems are given by inappropriate tension. Wearing protective gloves and making sure that the appliance is cold (so not immediately after cutting), loosen the nuts that fix the bar to the side of the chain saw, then raise the tip to adjust the tension, tightening the chain tensioner screw. Then tighten the bar nuts, first the rear one, then the front one. Another rule to follow is to constantly lubricate the chainsaw chain, to avoid excessive friction and wear of the instrument. Furthermore, the depth delimiter must be adjusted correctly, so as to have good and safe performance. It must always be done before sharpening the chainsaw chain.
Sharpen the chainsaw chain is a basic procedure for the correct operation of the instrument. Otherwise, the blade will wear out quickly. Sharpen the chain saw is a maintenance operation to be carried out every time the cut produces a lot of sawdust: in fact, it is possible to understand the state of the chain from the type of cut. In the case where the cut is fine and clean, it means that it is still well sharpened, as well as if the sawdust produced has the appearance of splinters; if instead it looks like a very fine powder, it must be sharpened. The operations to do before proceeding to sharpening are to define what the chain size is: in fact, one must purchase a rotating wheel or a specific chain saw file that is suitable for the blade in question. As chainsaws have teeth of various sizes, the grinding wheel or file must have a corresponding diameter. The most common diameters are 3/16, 7/32 and 5/32 of an inch.
The different steps of the sharpening
First you need to clean the surface well, using mineral turpentine or a degreasing detergent, to remove residual oil, debris and dirt. Therefore, check that there are no broken, bent or too worn teeth and meshes. In this case, the chain must be replaced. Once this is done, the chainsaw must be placed on a solid flat surface; alternatively, it can be tightened in a vice. The latter is the best option, as the chainsaw is supported in a stable manner, while the chain can rotate without effort. To sharpen it you must identify the main cutting edge, the lower one: this will be the starting point. If the cutting edges are the same length, you can start from any point. Each cutting edge must be sharpened so that the flat edge has the same length. By doing so, each of them will cut in the same way.
Sharpen chainsaw chain: The last steps of the sharpening
Therefore, the chain of the chainsaw must be sharpened with a file: just place it in the hollow in front of a cutting edge, that is in the inclined tooth in front of the flat part of a ring. Position the file so that its curve adapts to that of the cutting edge face, and that its upper part reaches the tip of the tooth. Attention: the file must have the same angle with which the cutting edge was sharpened the first time (25 ° or 30 °). Now it is necessary to carry out sharpening by performing a slight twisting motion: in this way the scales of polished metal are eliminated. Do this for each tooth, by sliding the chain, so that the tooth to be sharpened is always above the chain saw. Reverse the side of the saw and repeat the entire operation. Then check the distance of the rakers (ie of the hooked rings between the cutting edges): they must be lower than about 0.25 cm. If not, sharpen them. Finally, oil the chain.