SIST EN 14081-4:2005+A2:2008
(Main)Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
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 systemes 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
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systemsStructures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systemes de contrôle par machineHolzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte SystemeTa slovenski standard je istoveten z:EN 14081-4:2005+A2:2007SIST EN 14081-4:2005+A2:2008en,fr,de91.080.2079.040ICS:SLOVENSKI
STANDARDSIST EN 14081-4:2005+A2:200801-april-2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-4:2005+A2
September 2007 ICS 79.040 Supersedes EN 14081-4:2005+A1:2006English 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 and Amendment 2 approved by CEN on 13 August 2007.
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 © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14081-4:2005+A2:2007: E
EN 14081-4:2005+A2:2007 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Symbols.4 5 Settings for timber strength grading machines.5
EN 14081-4:2005+A2:2007 (E) 3 Foreword This European Standard (EN 14081-4:2005+A2:2007) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by SFS. This document shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2008 and conflicting national standards shall be withdrawn at the latest by March 2008. This document includes Amendment 1, approved by CEN on 2006-12-28 and Amendment 2, approved by CEN on 2007-08-13. This document supersedes EN 14081-4:2005+A1:2006. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". 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.
EN 14081-4:2005+A2:2007 (E) 4 1 Scope 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 European Standard. 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 purpose of this European Standard the terms and definitions in EN 14081-1:2005 and
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)
EN 14081-4:2005+A2:2007 (E) 5
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 6 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.
EN 14081-4:2005+A2:2007 (E) 6 Table 1 — Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF Source country or countries Source marka)
Species Permitted timber sizesb) (mm) Gradec)
or grade Combination Model value
Feed speed Range (m/min) Comments and additional requirements C24
C16 F = 2,68 F = 2,27 150 max Spruce Picea abies Picea sitchensis 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,24 150 max C24 C16 F = 2,79 F = 1,90 150 max UK Ireland GB IE Pine
Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,34 150 max C27 C16 F = 2,48 F = 1,64 150 max Chile CL Radiata pine
Pinus radiata 44 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C24 C16 F = 2,35 F = 1,92 150 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
#(bar)$ ()735729,413n1.701nnn+=ttFbF
(kN) 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.
EN 14081-4:2005+A2:2007 (E) 7 #Table 1 — Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF (continued) Source country or countries Source mark a
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 = 79.0mod24,022,0f4228nnbt
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. $
EN 14081-4:2005+A2:2007 (E) 8 Table 1 — Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF (continued) Source country or countries Source marka)
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.
EN 14081-4:2005+A2:2007 (E) 9 Table 2 — Settings for Computermatic and Micromatic machines Model Value Source country or countries Source marka)
Species Permitted timber sizesb) (mm) Gradec) or grade combination Deflec-tion 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 6,89 10,37 105 max Chile CL Radiata pine Pinus radiata 44 ≤ tn ≤ 50
60 ≤ bn ≤ 300 C24 C16 7,25 8,88 105 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).
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 = 0,0101 bn tn2 ()()91,0101985,06784,067005,071,36nn5nnn+×+=−btttaa 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.
EN 14081-4:2005+A2:2007 (E) 10 #Table 2 — Settings for Computermatic and Micromatic machines (continued) Model value Source country or countries Source mark a Species Permitted timber
sizes b (mm) Grade c or grade combination Deflectiona
(mm) Feed speed range (m/min) Comments and additional requirements C24 9,82 C27 6,21 C30 4,75 C35 3,40 C27 C16 5,85 8,92 C30 C18 4,75 9,82 C30 C24 C18 4,46 5,49 8,92 C35 C24 C18 3,40 5,49 8,92 Finland Norway
Sweden Estonia Latvia Russia d Poland
Finland Norway Sweden Latvia
FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C40 C27 2,85 5,85 105 max. TR26 is a UK grade for trussed rafters. Its primary characteristic values are:
ƒm,k = 28,3 N/mm², E0,mean = 11 000 N/mm², k = 370 kg/m³ Other characteristic values can be calculated from the equations given in EN 384. Equation (2) shall be used to calculate settings for the target size tn x bn. where tn and bn are target dimensions. Actual deflection settings an shall be rounded 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 3natt. 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)
19,015050500901,0186,0−=nnnnbttaa (2) Requirements for grading: − Air temperature
10 °C to 50 °C − Relative humidity in the air
< 85 % − Timber temperature
> -10 °C − Timber moisture content
> 10 % 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.
EN 14081-4:2005+A2:2007 (E) 11 Table 2 — Settings for Computermatic and Micromatic machines (continued) Model value Source country or countries Source mark aSpecies Permitted timber Sizes b (mm) Grade
or grade combinationDeflectiona
(mm) Feed speed range (m/min) Comments and additional requirements 30 ≤ tn ≤ 75 TR26 6,21 105 max. 60 ≤ bn ≤ 300
Finland Norway
Sweden Estonia Latvia Russia c Poland
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV
Spruce Picea abies
Pine Pinus sylvestris
TR26 is a UK grade for trussed rafters. Its primary characteristic values are:
ƒm,k = 28,3 N/mm², E0,mean = 11 000 N/mm², k = 370 kg/m³ Other characteristic values can be calculated from the equations given in EN 384. Equation (2) shall be used to calculate settings for the target size tn x bn. where tn and bn are target dimensions. Actual deflection settings an shall be rounded 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 3natt. 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)
19,015050500901,0186,0−=nnnnbttaa (2) Requirements for grading: − Air temperature
10 °C to 50 °C − Relative humidity in the air
< 85 % − Timber temperature
> -10 °C − Timber moisture content
> 10 % a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. $
EN 14081-4:2005+A2:2007 (E) 12 #Table 3 — Settings for Raute Timgrader machines Source country or countries Source mark a
Species Permitted timber sizes b (mm) Grade c or grade
combination fmod for calc. of settings Comments and additional requirements C40 C30 C24 C18 50,8 40,6 31,3 21,6 C35 C27 C18 43,4 31,7 21,6 C40 C30 C24 C18 50,8 40,6 31,3 21,6 Finland Norway Sweden Estonia. Latvia Russia d Poland
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 225
C35 C27 C18
43,4 31,7 21,6 Requirements for grading: • air temperature between 10 °C and 50 ºC; • timber temperature greater than -10 ºC; • air relative humidity less than 85 %; • timber mean moisture content greater than 10 %; • feed speed between 48 m/min and 124 m/min.
The following equation shall be used to calculate settings
afbtF727,0mod259,1n749,1nn000524,0=
where Fn is the indicating property in N (to obtain the indicating property in kilopound Fn shall be divided by 9,81), tn is the target thickness in mm, bn is the target width in mm (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the above equation is the target tn + 1 mm.) and fmod is given in the 6th column of this table for each grade. a is the pre-set deflection in mm and shall be: a = 1,3 mm for 70 ≤ t ≤ 75 mm a = 1,4 mm
for 61 ≤ t ≤ 69 mm a = 1,5 mm
for 54 ≤ t ≤ 60 mm a = 1,6 mm
for 47 ≤ t ≤ 53 mm a = 1,7 mm
for 44 ≤ t ≤ 46 mm a = 1,8 mm
for 41 ≤ t ≤ 43 mm a = 1,9 mm
for 38 ≤ t ≤ 40 mm a = 2,0 mm
for 36 ≤ t ≤ 37 mm a = 2,1 mm
for 34 ≤ t ≤ 35 mm a = 2,2 mm
for 32 ≤ t ≤ 33 mm a = 2,3 mm
for 30 ≤ t ≤ 31 mm 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. $
EN 14081-4:2005+A2:2007 (E) 13 #Table 4a — Settings for Euro-GreComat 702 Source country or countries Source mark a Species Permitted timber size b [mm] Grade or grade combination Settings Comments and additional requirements Germany DE 30 ≤tn ≤ 55 L35 IP ≥ 34,0 These grades apply to boards for glued laminated timber. Austria AT Spruce Picea abies 80 ≤bn≤ 280L24 34,0 > IP ≥ 21,0 The characteristic values for the grades are:
L35 L24
Czech Republic CZ Fir Abies alba
ft,k [N/mm²] 21,0 14,0
Et,mean[N/mm²] 13 000 11 000
ρρρρk
[kg/m³] 400 350
Requirements for grading:
- timber temperature greater than 0 °C;
- timber mean moisture content between 7 % and 15 %;
- feed speed between 80 m/min and 300 m/min;
- timber surface planed or sawn.
a
See 7.3 of EN 14081-1:2005. b
Timber size shall be according to EN 336.
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