BS ISO 9518:2018,Forestry machinery – Portable chain-saws – Kickback test.BS ISO 9518:2018 pdf free download.The size of this pdf file is 4.52M.
2 Normative references
ISO 6531,Machinery for forestry-Portable chain-saws-Vocabulary.
ISO 6535,Portable chain-saws -Chain brake performance.
4.1 Principles
The flat surface of the test specimen (MDF) is thrust into contact with the moving saw-chain at th tip of a chain-saw guide bar at a specified speed in order to produce a simulated kickback reaction.This takes place under controlled conditions in the kickback machine, which is designed to measure the magnitude of rotary and horizontal energies generated during the resulting kickback reaction.
A step-by-step search, covering a range of critical test conditions, determines the peak energy value to be used in calculating the computed kickback angle(s) CKA using the analytical model. This peak value is intended to simulate the most severe conditions reasonably expected to be encountered by typical users.
Since there may be some variability, several impacts are made under each set of conditions and the results averaged.
BS ISO 9518:2018 specifies the methodology for determining the kickback potential of gasoline-powered and electric-powered (including battery powered) chain-saws, complete with guide bar and saw-chain.
BS ISO 9518:2018 has been demonstrated to be an accurate method of measurement for evaluating computed kickback angles and energy associated with chain-saw kickback for electric-powered chain-saws (including battery powered) and gasoline-powered chain-saws with engine capacity up to 80 cm3. It is not intended to evaluate chain-saws with an engine capacity of above 80 cm3. Furthermore, because of physical size limitations of the kickback machine, it is not intended for testing of units with guide bar cutting length in excess of 63 cm.
Modifications to the methodology for determining the kickback potential introduced in this edition are aimed to have a better reproducibility of the results; test results obtained according to the previous methodology still maintain their validity.
