EN 14081-3:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 3: Maschinelle Sortierung, Zusätzliche Anforderungen an die werkseigene ProduktionskontrolleStructures en bois - Bois de structure à section rectangulaire classé pour sa résistance - Partie 3: Classement mécanique - Exigences complémentaires relatives au contrôle de la production en usineTimber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine grading; additional requirements for factory production control91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-3:2012SIST EN 14081-3:2012en,fr,de01-oktober-2012SIST EN 14081-3:2012SLOVENSKI
STANDARDSIST EN 14081-3:20061DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-3
January 2012 ICS 79.040 Supersedes EN 14081-3:2005English Version
Timber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine grading; additional requirements for factory production control
Structures en bois - Bois de structure à section rectangulaire classé pour sa résistance - Partie 3: Classement mécanique - Exigences complémentaires relatives au contrôle de la production en usine
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 3: Maschinelle Sortierung, zusätzliche Anforderungen an die werkseigene Produktionskontrolle This European Standard was approved by CEN on 16 December 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14081-3:2012: ESIST EN 14081-3:2012

Requirements for using control planks .8A.1General .8A.2Requirements for selecting the control planks .8A.3Requirements for the use of control planks for internal factory production control .8A.4Requirements for the use of control planks for third party factory production control .9Annex B (informative)
Additional factory production control requirements for output controlled systems . 10B.1General . 10B.2Production control . 10Annex C (informative)
Example of cusum control charts . 13Bibliography . 17 SIST EN 14081-3:2012

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2012, and conflicting national standards shall be withdrawn at the latest by July 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14081-3:2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. Other parts of the series of EN 14081 are:  EN 14081-1, Timber structures
Strength graded structural timber with rectangular cross section
Part 1: General requirements;  EN 14081-2, Timber structures
Strength graded structural timber with rectangular cross section
Part 2: Machine grading; additional requirements for initial type testing;  EN 14081-4, Timber structures
Strength graded structural timber with rectangular cross section
Part 4: Machine grading
Grading machine settings for machine controlled systems. Compared to EN 14081-3:2005 the following modifications have been made:  the additional factory production control requirements for output controlled systems are transferred in Annex B (informative);
 in Annex A, the requirements for using control planks are updated.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
cusum control parameter
B
cusum control parameter
Ba
cusum parameter associated with acceptable quality level
cusum parameter associated with rejectable quality level Ep
actual modulus of elasticity measured in a proof load test (in N/mm2)
E0,mean
characteristic mean modulus of elasticity parallel to grain (in N/mm2)
Fp
proof load (in N)
K
cusum control parameter
La
run length in acceptable region for cusum control
Lr
run length in rejectable region for cusum control
N
cusum control parameter
Y
cusum control parameter
Z
cusum control parameter 5 Requirements for the operation, calibration and maintenance of a grading machine 5.1 No modifications that are in conflict with the machine manufacturer’s specification shall be made to the machine. 5.2 Access to all machine adjustments shall be limited to personnel authorised to operate or set up the machine. 5.3 The strength grading machine shall be regularly calibrated in accordance with the manufacturer's specification. 5.4 A strength grading machine shall only be fitted with spare parts equivalent to, or improving upon, the performance of those fitted at the time the machine was assessed by initial type testing. If spare parts are fitted that are not identical to those fitted at the time the machine was assessed by initial type testing, the machine shall be reassessed to establish their effect on grading accuracy. 5.5 The results of routine service and maintenance to the strength-grading machine and ancillary equipment shall be recorded together with the results of calibration checks. 6 Additional requirements for factory production control for machine controlled systems 6.1 General When grading structural timber in a machine controlled system, grading accuracy shall be monitored, A grading machine’s dynamic performance shall be controlled by the use of control planks using the procedures given in Annex A. 6.2 Requirements for strength grades with a characteristic strength level above C30 During each working shift, two pieces of timber from each grade produced shall be randomly selected and tested for edgewise bending strength as given in EN 408 with the tension edge selected at random and the estimated weakest cross section positioned where possible within the centre third of the span. The fifth SIST EN 14081-3:2012
...