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BS EN 14081-2:2018

BS EN 14081-2:2018

$167.15

Timber structures. Strength graded structural timber with rectangular cross section – Machine grading; additional requirements for type testing

Published By Publication Date Number of Pages
BSI 2018 42
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This document specifies requirements, additional to those of EN 14081-1, for type testing of machine graded structural timber with rectangular cross-sections shaped by sawing, planning or other methods, and having deviations from the target sizes corresponding to EN 336. This includes requirements for strength grading machines.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols and abbreviations
11 5 Requirements for strength grading machines
12 6 Derivation of settings for machine control systems
6.1 Requirements on sampling
13 6.2 Requirements for grading process, destructive testing and calculation of grade determining properties
6.2.1 Grading process
6.2.2 Destructive testing
6.2.3 Calculations of grade determining properties
14 6.3 Requirements for a setting area
6.3.1 General
6.3.2 Standardized areas
6.4 Requirements for the derivation and verification of machine settings
6.4.1 Derivation of machine settings
15 6.4.2 Verification of machine settings
6.4.2.1 Introduction
6.4.2.2 Verification for new settings
16 6.4.2.3 Verification of expansion of existing settings to a larger setting area (expansion check)
6.4.2.4 Checking that existing settings are grading correctly in a particular location
17 6.5 Fixed settings
6.6 Reporting
19 7 Additional verification requirements for a new grading machine or a change in scope of existing grading machines for machine control systems
7.1 Repeatability
7.2 Machine installation check
20 8 Derivation of settings for output control systems
8.1 General
8.2 Initial machine settings
8.3 Verification of machine settings
8.3.1 Sampling
8.3.2 Destructive testing and calculation of characteristic values
8.3.3 Requirements for verification of machine settings
8.4 Report
21 9 Requirements for adaptive settings
9.1 Method
22 9.2 Conditions
23 Annex A (informative)Guidelines for sampling a growth area for deriving machine settings
25 Annex B (informative)Prediction limit method
B.1 General
B.2 Model determination
26 B.3 Settings calculation
27 Annex C (normative)Determination of the global cost matrix
C.1 Introduction
C.2 Optimum grading
C.3 IP grading
28 C.4 Calculation of size matrix
C.5 Calculation of elementary cost matrix
C.5.1 Introduction
C.5.2 Factors for wrongly upgraded pieces
29 C.5.3 Factors for wrongly downgraded pieces
C.5.4 Examples of elementary cost matrices for C, T and D classes
32 C.6 Calculation of a global cost matrix
33 Annex D (informative)Settings for C and T-classes

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BS EN 14081-2:2018
$167.15