EN 14081-4:2005+A3:2008

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.

Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte Systeme

Diese Europäische Norm enthält Einstellungen in Übereinstimmung mit den in EN 14081-2 festgelegten
Anforderungen für verschiedene Kombinationen von Festigkeitsklassen oder Sortierklassen, für verschiedene
Sortiermaschinen und verschiedene Holzarten unterschiedlicher Herkunft. Diese Einstellungen beziehen sich
nur auf Bauholz der in den Tabellen angegebenen Herkunftsländer.

Structures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machine

La présente Norme européenne donne les réglages, obtenus conformément aux exigences de l’EN 14081-2, relatifs
aux différentes combinaisons de classes ou catégories de résistance, aux machines de classement et aux essences
issues de différentes sources. Ces réglages ne sont applicables qu'aux bois provenant des sources indiquées dans
les tableaux.

Lesene konstrukcije - Razvrščanje konstrukcijskega lesa pravokotnega prečnega prereza po trdnosti - 4. del: Strojno razvrščanje - Nastavitve strojev za razvrščanje pri strojno kontroliranih sistemih

General Information

• Status: Withdrawn
• Publication Date: 11-Mar-2008
• Withdrawal Date: 16-Dec-2008
• ICS: 79.040 - Wood, sawlogs and sawn timber
• ICS: 79.120.10 - Woodworking machines
• Technical Committee: CEN/TC 124 - Timber structures
• Drafting Committee: CEN/TC 124/WG 2 - Solid timber
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 17-Dec-2008
• Completion Date: 17-Dec-2008
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/112 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on structural timber products
• Ref Project: SIST EN 14081-4:2005+A3:2008 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems

Relations

• Merged Into: EN 14081-4:2005+A4:2008 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 18-Jan-2023
• Merged From: EN 14081-4:2005+A2:2007/prA3 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 18-Jan-2023
• Merged From: EN 14081-4:2005+A2:2007 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 22-Dec-2008
• Consolidates: EN 14081-4:2005+A1:2007 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 22-Dec-2008
• Amended By: EN 14081-4:2005/prA4 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 22-Dec-2008
• Revised: EN 14081-4:2009 - Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
• Effective Date: 22-Dec-2008

Standards Content (Sample)

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 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte SystemeStructures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machineTimber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-4:2005+A3:2008SIST EN 14081-4:2005+A3:2008en,fr,de01-oktober-2008SIST EN 14081-4:2005+A3:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-4:2005+A3
March 2008 ICS 79.120.10; 79.040 Supersedes EN 14081-4:2005+A2:2007English Version
Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
Structures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machine
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte Systeme This European Standard was approved by CEN on 26 August 2005 and includes Amendment 1 approved by CEN on 28 December 2006, Amendment 2 approved by CEN on 13 August 2007 and Amendment 3 approved by CEN on 7 February 2008.
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 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14081-4:2005+A3:2008: ESIST EN 14081-4:2005+A3:2008

! ", # $ and % &. Other parts of this European Standard 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 14081-3, Timber structures - Strength graded structural timber with rectangular cross section -
Part 3: Machine Grading - Additional requirements for factory production control 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, 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 and United Kingdom. SIST EN 14081-4:2005+A3:2008

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). 4 Symbols a deflection (in mm) b width of timber cross section (in mm)
F force (units as stated) I indicating property (units as stated) P pressure (units as stated) t thickness of timber cross section (in mm) Et,mean characteristic mean tensile modulus of elasticity parallel to grain (in N/mm2)
ft,k characteristic tensile strength (in N/mm2)
ρk characteristic value of density (in kg/m3) SIST EN 14081-4:2005+A3:2008

subscripts
n for setting being calculated a actual size measured as the average dimension of a batch 5 Settings for timber strength grading machines %Tables 1 to 9& give settings for certain grades, timber species and types of grading machine. Settings for other grades, species or grading machines shall be added when the relevant information is sent to, and assessed by, CEN/TC 124.
country or countries Source mark a
Species Permitted timber sizes b (mm) Grade c or grade combination Model value F Feed speed range (m/min) Comments and additional requirements UK Ireland 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 F = 2,68 F = 2,27 150 max. Minimum temperature of timber at time of grading shall be -10 °C. The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn timber, tn in the following equations is the target tn + 1 mm.)
an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61
(bar) ()572739,413n1.701nnn+=ttFbF
Spruce Picea abies Picea sitchensis
C16 F = 1,24 150 max.
C24 C16 F = 2,79 F = 1,90 150 max.
GB IE Pine Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,34 150 max. C27 C16 F = 3,03 F = 1,43 150 max. C24 C16 F = 2,32 F = 2,09 150 max. Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C16 F = 0,92 150 max.
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. & SIST EN 14081-4:2005+A3:2008

Species Permitted timber sizes b (mm) Grade c or grade combination Model value
Feed speed range (m/min) Comments and adjustments for size C18 ƒmod = 20,8 C24 ƒmod = 20,8 C27 ƒmod = 21,8 C30 ƒmod = 28,5 C24 C35 ƒmod = 20,0 ƒmod = 46,5 Estonia Finland Latvia Norway Russia d Sweden Poland
Finland Norway Sweden Latvia EE FI LV NO RU SE PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 C30 C40 ƒmod = 23,8 ƒmod = 30,6 ƒmod = 54,5 150 max.
Air temperature to be +10 oC min. +35 oC max. Minimum timber temperature to be -10 oC Maximum relative humidity to be 85 % Timber mean moisture content to be > 10 % The following equations shall be used to calculate settings for the target size bn × tn. (NOTE For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm).
Pn = 4,412 Fn / tn0,61
(bar)
Fn
= (5,5I n n bntn3)10-12
(kN)
an = 830,7 tn-1,299
I n = 79.0mod24,022,0f4228nnbt
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia. $ SIST EN 14081-4:2005+A3:2008

Species Permitted timber sizesb) (mm) Gradec) or grade combina-tion Model value
Feed speed Range (m/min) Comments and additional requirements Spain ES Scots pine Pinus Sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C27
C16 F = 2,84
F = 1,71
100 max Minimum temperature of timber at time of grading shall be -10 oC. The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 ()735729,413n1.701nnn+=ttFbF
(kN) Spain ES Corsican pine Pinus nigra 40 ≤ tn ≤ 70
100≤bn ≤ 200 C30
C18 Not relevant as all settings shall be calculated using equations in comments column 100 max Minimum temperature of timber at time of grading shall be
-10 oC. The following equations shall be used to calculate settings for the target size bn x tn.
(Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 FnC30 = (96,2979 – 0,489321tn)anbntn3 / (1,3189433.109 ) FnC18 = (54,4979 – 0,489321tn)anbntn3 / (1,3189433.109 ) a) See 7.3 of EN 14081-1:2005. b) Timber sizes shall be to EN 336. c) Grades prefixed by C are strength classes given in EN 338.
Species Permitted timber sizes b (mm) Grade cor grade combi-nation Deflection a (mm) Feed speed range (m/min) Comments and additional requirements C24 C16
6,35 7,49 105 max. Spruce Picea abies Picea
sitchensis 35 ≤ tn ≤ 75
60 ≤ bn ≤ 300 C16 13,78 105 max. C24 C16
6,10 8,97 105 max. UK Ireland GB IE Pine Pinus nigra Pinus
sylvestris 35 ≤ tn ≤ 75
60 ≤ bn ≤ 300 C16 12,74 105 max. C27 C16 5,62 11,86 105 max. C24 C16 7,35 8,13 105 max. Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50
60 ≤ bn ≤ 300 C16 18,52 105 max. Minimum temperature of timber at time of grading shall be -10 °C. The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.) Actual deflection settings are determined from an/0,19 rounded to the nearest whole number. Refer to calibration tables for machine to convert Force Fn to pressure setting Fn = 0,010 1 bn tn2 ()()91,0109851,07846,000567,071,36nn5nnn+×+=−btttaa a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338.
or grade combination Model value fmod Feed speed range (m/min) Comments and additional requirements Norway NO Sitka spruce Picea Sitchensis 33 < tn <53 88 < bn < 218 C18 C30 27,9 38,8 105 max.
Equation (2) shall be used to calculate settings for the target size tn and bn where tn and bn are target dimensions. Actual deflection setting an shall be rounded up to the nearest whole number. If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt To convert from stress to force Fn use equation (1).
Refer to calibration tables for machine to convert Fn to pressure setting.
20101,0nnntbF⋅⋅=
(1) BITfbtfbtannnnn⋅⋅−⋅⋅⋅=−mod152,0186,0mod152,0814,014,218063 d
(2)
Requirements for grading:
- air temperature: 10 °C to 50 °C; - relative humidity in the air: < 85 %; - timber temperature: > -10 °C; - timber mean moisture content: > 10 %. a
See 7.3 of EN 14081-1:2005. b
Timber sizes shall be according to EN 336.
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