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Torques from manual tools for directional tree felling

Lindroos, Ola and Gullberg, Tomas and Nordfjell, Tomas (2007). Torques from manual tools for directional tree felling. International journal of forest engineering. 18 :2 , 40-51
[Research article]

[img] PDF (Torques from Manual Tools for Directional Tree Felling)


Motor-manual tree felling is commonly practiced in many regions of the world. Trees falling in unwanted directions cause severe accidents and extra work in motor-manual logging. Different kinds of manual tools can help force trees to fall in the desired direction, but their capacity are uncertain due to a lack of suitable evaluation methods. Reliable recommendations of felling tools’ limits could help reduce human injuries and damage to property. The objective of this study was, therefore, to develop and evaluate a realistic and convenient method for studying felling tools’ capacity in terms of the potential torque they can generate. A theoretical model of torque components was constructed and the mechanics of the falling tree and of the studied equipment were explained. The developed method uses real trees, which were cut at 1.65 m above stump height to create trial stems. Trial stems were anchored to a neighboring tree and then cut as if they were to be felled. Standardized forces were applied to a forestry jack, felling lever, and wedge, and their effects on the trial stem were recorded by a load cell in the anchoring line. The method proved suitable for the evaluation of forestry jacks, while it needs improvements to evaluate felling levers and wedges thoroughly. Methodological improvements are suggested and practical applications are discussed and demonstrated in terms of the forestry jack’s capacity to deal with trees with unfavorable angles of inclination.

Authors/Creators:Lindroos, Ola and Gullberg, Tomas and Nordfjell, Tomas
Title:Torques from manual tools for directional tree felling
Series Name/Journal:International journal of forest engineering
Year of publishing :2007
Page range:40-51
Publisher:Forest Products Society
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:J Handling, transport, storage and protection of agricultural products > J12 Handling, transport, storage and protection of forest products
K Forestry > K11 Forest engineering
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 203 Mechanical Engineering > Other Mechanical Engineering
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Force, tree felling, forestry jack, felling lever, wedge, method development, experimental study
Permanent URL:
Alternative URL:http://journals.hil.unb.ca/index.php/IJFE/article/view/5710
ID Code:8225
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Ola Lindroos
Deposited On:17 Aug 2011 06:34
Metadata Last Modified:02 Dec 2014 10:46

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