| Sharpening |
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The saw sharpening, if done correctly, leaves neither burn marks in saw gullets of the toothing nor dapping marks left by a grinding wheel. It is important achieve a smooth surface and to eliminate any surface irregularities arising at the saw side during sharpening. The saw should be sharpened in four passes through the sharpener. First pass should be regarded as the initial one, second and third as equalizing and fourth as smoothing one. Overheating of cutting edges, teeth and saw gullets is a very frequent sharpening defect.
The cutting edge height of saws should be as follows:
It is important to maintain an ample saw gullet radius. When the radius is insufficient, cracks may appear in the saw gullet. Frequent sharpening is beneficial to saws durability, because it eliminates micro-cracks in saw gullets. Each sharpening should be carried on until micro-cracks are eliminated. After sharpening any surface irregularities left should be filed away. If left on the cutting edge, such surface imperfections tend to wrap along a tooth during cutting and the saw becomes blunt at one side. |