This thesis investigates the influence of chain sharpening machine type on the efficiency of wood cross-cutting and exposure to vibration. With each chain, 18 cuts of spruce prism were performed with a Stihl chainsaw model MS 362. The results of the study show that cross-cutting with ground chains which were later sharpened was 55 % to 81 % less efficient than with an industrially sharpened chain. Among machine-sharpened chains, the most efficient was the chain sharpened with the most expensive Vollmer Werke Cane / e machine. The vibration exposure on the top and rear handles was highest when using an industrially sharpened chain, and lowest when it was sharpened with the most expensive Vollmer Werke Cane / e machine. When using all chains, the vibrations were higher on the top than on the rear handle. The water content in the wood affects the cross-cutting efficiency as well as the vibrations magnitude, which only applies to machine-sharpened chains. With the cross-cutting efficiency, the vibrations on both handles were significantly increased when using an industrially sharpened chain. The findings of the research are useful to simplify the decision when choosing a chainsaw sharpening machine for a professional forestry worker, or for the occasional chainsaw user.
|
