Stihl 056 Instruction Manual - Page 33
Sharpening and Maintenance
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Sharpening and Maintenance of Saw Chain Description of chains Top: Component parts of Oilomatic Rapid chain Bottom: Measuring chain pitch r- STIHL saw chains are 3-link chains and all versions are assembled in the same basic pattern. The illustration on the right shows the component parts of a saw chain. Every chain manufactured by STIHL features the exclusive Oilomatic system. Apart from the three basic types (Rapid, Picco and Topic), there are three different versions whose names denote the cutter shape, i. e. chipper tooth = Stan- dard, semi-chisel = Micro and full chisel = Super. Oilo- matic Rapid chains are also available in standard and safety versions. The main size measurement on a saw chain is the pitch. It is determined by measuring the distance from the center of one rivet to the center of the next rivet but one and dividing the measurement by two. The result is the pitch which, in accordance with international custom, is specified in inch (3/8" = 9.32 mm). Like any other cutting tool, the saw chain is subject to normal wear. A properly sharpened chain will eat into the wood and' require very little effort on the part of the operator. For this reason alone you should never attempt to cut with a dull or damaged chain. 1 = Preset tie strap 2 = Right hand salety link 3 = Right hand cutter 4 = Tie strap 5 = Rivet 6 = Drive link 7 = Left hand cutter 8 = Left hand safety link There are a few crucial angles which must be maintained in order to obtain good results when sharpening a chain. They are explained below. Filing angle The filing angle for Rapid-Standard and Rapid-Micro chains is 35°; these chains are initially sharpened to this angle before leaving the factory. However, if the chain is used primarily for cutting hardwood or frozen timber it is best to sharpen it to an angle of 30°. On the other hand, the filing angle for Rapid-Super and Topic-Super is always 30°. 31
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