SIST EN 14081-4:2006+A1:2007
(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
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.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 systemes 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+A1:2007SIST EN 14081-4:2006+A1:2007en,fr,de01-september-2007SIST EN 14081-4:2006+A1:2007SLOVENSKI
STANDARD
SIST EN 14081-4:2006+A1:2007
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-4:2005+A1
February 2007 ICS 91.080.20 Supersedes EN 14081-4:2005English 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 clasé 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.
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+A1:2007: ESIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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
SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (E) 3 Foreword This European Standard (EN 14081-4:2005+A1:2007) 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 August 2007 and conflicting national standards shall be withdrawn at the latest by August 2007. This document includes Amendment 1, approved by CEN on 2006-12-28. This document supersedes EN 14081-4:2005. 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. SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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) SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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.
SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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 ()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.
SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (E) 7 Table 1 — Settings for Cook Bolinder (Tecmach) machine types SG-AR, SG-AF and SG-TF (continued) Source country or countries Source marka)
Species Permitted timber sizesb) (mm) Grade c)
or grade Combina-tion Model value
Feed speed Range (m/min) Comments and additional requirements C18 fmod= 20,8 C24 fmod= 20,8 C27 fmod= 21,8 C30 fmod= 28,5 C24 C35 fmod= 20,0 fmod= 46,5 Estonia Finland Latvia Norway Russiad) Sweden !Poland! EE FI LV NO RU SE !PL" Spruce Picea abies Pine Pinus
Sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 C30 C40 fmod= 23,8 fmod= 30,6 fmod= 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 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).
Fn
= (5,5I n n bntn3)10-9
(N)
an = 830,7 tn-1,299
I n = 79.0mod24,022,0f8422nnbt
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. d) Settings apply only to timber grown west of the Ural mountain range in Russia.
SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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. SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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. SIST EN 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (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) Gradec)
or grade combinationDeflection a
(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 C40 C27 2,85 5,85 Finland, Norway, Sweden, Estonia. Latvia Russiad) !Poland" FI NO SE ES LV RU !PL" Spruce, Picea Abies Pine Pinus Sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300
105 max 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.
21010,0nnntbF=
(1)
19,015050500901,0186,0−=nnnnbttaa (2)
Requirements for grading: − Air temperature
10 °C – 50 °C− Relative humidity in the air
< 85 % − Timber temperature
> -10 °C − Timber mean moisture content
> 10 % a) See clause 7.3 of EN14081-1:2005. b) Timber sizes shall be 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 14081-4:2006+A1:2007
EN 14081-4:2005+A1:2007 (E) 11 !Table 2 — Settings for Computermatic and Micromatic machines (continued) Model valueSource country or countries Source mark a Species
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