drvo
description
Transcript of drvo
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Drvo, vrste drva ialati za obradu
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DRVO, VRSTE DRVA I ALATI ZA OBRADU DRVA
Drvo – biljka (stablo), sirovina i materijal za proizvodnju Stablo – tri glavna dijela: korijen, deblo i krošnja Deblo – najvažniji dio za proizvodnju greda, dasaka, letvi, furnira Vrste drva – četinjače ili crnogorica (jela,smreka, bor, ariš) i listače ili bjelogorica (hrast, jasen, orah, bukva, grab, javor, lipa, mahagonij…)
Tehničko drvo – drvo koje se podvrgava preradi ručnim alatima ili strojevima Svojstva drva – estetska (boja, tekstura, sjaj, finoća, miris, poroznost), fizikalna (sposobnost upijanja vlage, vlažnost, masa, vodič zvuka) i mehanička (čvrstoća, tvrdoća, elastičnost, cjepljivost)
Pribor za mjerenje i obilježavanje – stolarski metar, kutnik, crtalo, šilo, stolarska olovka Ručni alati za obradu drva – pile (rezbarska, listarica, jarmenica, za piljenje furnira), bušilice (svrdlo, stolarska bušilica), blanje (različitih oblika i širina noža), dlijeta (razni oblici i širine oštrice), rašpe, stege
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Stablo i njegovi dijelovi
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Put drva od stabla do prozora
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Građa drva
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Vrste drva
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Proizvodi od drva
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1.Furnir - tanke drvene ploče debljine od 0,7 do 2,5 mm2.Šperploča – drvene ukočene ploče izrađene od neparnog broja furnira koji su međusobno križno slijepljenji podkutom od 90˚, debljine od 3, 4, 5 do 22 mm- dijelovi namještaja, građevna stolarija, modeli i makete3.Panel ploča – ukočene troslojne drvene ploče, srednjisloj izrađen je od letvica, a vanjski od furnira debelog 3 mm- letve i furniri slažu se pod kutom od 90º- debljine panel ploča kreću se od 14 do 22 mm -izrada pokućstva4.Iverice – ploče izrađene od drvenog iverja- debljina od 4 do 30 mm- izrada pokućstva, građevinarstvo5.Greda – građevinarstvo, velika opterećenja6.Daska – građevinarstvo, pokućstvo7.Letva – građevinarstvo, pokučstvo
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Furnir
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Šperploča
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Panel ploča
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Iverica
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Alati za obradu
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Pribor za obilježavanje i mjerenje
• Kutnik• Šilo• Stolarska olovka• Paralelno crtalo• Stolarski metar
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Piljenje drva
• Rezbarska pilica• Pila listarica• Pila jarmenica
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Bušenje drva
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Blanjanje
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Dubljenje drva
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Predmeti od drva
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Izrada dašćice