ISO 9518:2018 林業機械—ポータブルチェーンソー—キックバックテスト | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually portable forest machinery.

This third edition cancels and replaces the second edition (ISO 9518:1998), which has been technically revised

Besides editorial corrections the following changes have been made to the previous edition of this document:

• Scope: inclusion of electric-powered chain-saws;
• 3 Terms and definitions: reference to ISO 6531 added and definitions updated;
• 4.3.6 Test specimens: hardness requirement for MDF test specimens added;
• 4.4.5 Kickback machine preparation: weight of standard and lightweight carriage defined;
• 4.4.8 Horizontal friction measurements: Horizontal friction test methods added;
• 4.4.9 Rotary friction measurements: Rotary friction test methods added;
• 4.4.10 Horizontal and rotary restraining systems alignment: Restraining systems adjustments specified more precisely;
• Annex B [Procedure for hardness testing of Medium Density Fibreboard (MDF)] has been added;
• Annex D (Chain-saw centre of gravity and inertia measurement) revised.

1 Scope

This document 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.

This document 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.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6531 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

3.1

bar nose radius

continuous radius formed on the top portion of the bar from the centreline of the bar to an angle 35° above the centreline

Note 1 to entry: See Figure 1.

Figure 1 — Bar nose radius

Bibliography