BS EN 14081-4:2009 pdf download – Timber structures — Strength graded structural timber with rectangular cross section Part 4: Machine grading — Grading machine settings for machine controlled systems
This European Standard gives settings, derived according to the requirements given in EN 14081-2, for various combinations of strength classes or grades, grading machines and species from particular sources of growth. These settings are only applicable to timber from the sources indicated in the tables.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 336, Structural timber – Sizes, permitted deviations EN 14081-1:2005, Timber structures – Strength graded structural timber with rectangular cross section – Part 1: General requirements
EN 14081-2:2005, Timber structures – Strength graded structural timber with rectangular cross section – Part 2: Machine Grading; additional requirements for initial type testing
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14081-1:2005, EN 14081- 2:2005 and the following apply.
3.1 Speed range maximum and minimum throughput speeds appropriate to the critical speed for the derived settings (see 6.2.2 of EN 14081-2:2005).
5 Settings for timber strength grading machines Tables 1 to 15 give settings for certain grades, timber species and types of grading machine. The accepted grading machines and settings in this European Standard are based on initial type testing (ITT) and initial type calculation (ITC). When additional ITT and ITC documentation from the manufacturers has been evaluated by CEN/TC124/TG1, the accepted values are given in an ITT report, which is the basis for certification by the Notified Bodies overseeing the producers’ factory production control (FPC). Those ITT reports may be used as ITT documentation before the information they contain becomes available in an amendment or revision of this European Standard, EN 14081-4.