BS EN 14081-2:2018 – TC:2020 Edition
$217.84
Tracked Changes. 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 | 2020 | 101 |
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 |
|---|---|
| 61 | undefined |
| 67 | 1 Scope 2 Normative references 3 Terms and definitions |
| 69 | 4 Symbols and abbreviations |
| 70 | 5 Requirements for strength grading machines |
| 71 | 6 Derivation of settings for machine control systems 6.1 Requirements on sampling |
| 72 | 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 |
| 73 | 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 |
| 74 | 6.4.2 Verification of machine settings 6.4.2.1 Introduction 6.4.2.2 Verification for new settings |
| 75 | 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 |
| 76 | 6.5 Fixed settings 6.6 Reporting |
| 78 | 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 |
| 79 | 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 |
| 80 | 9 Requirements for adaptive settings 9.1 Method |
| 81 | 9.2 Conditions |
| 82 | Annex A (informative)Guidelines for sampling a growth area for deriving machine settings |
| 84 | Annex B (informative)Prediction limit method B.1 General B.2 Model determination |
| 85 | B.3 Settings calculation |
| 86 | Annex C (normative)Determination of the global cost matrix C.1 Introduction C.2 Optimum grading C.3 IP grading |
| 87 | 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 |
| 88 | C.5.3 Factors for wrongly downgraded pieces C.5.4 Examples of elementary cost matrices for C, T and D classes |
| 91 | C.6 Calculation of a global cost matrix |
| 92 | Annex D (informative)Settings for C and T-classes |
