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Curve sawing effects on board dimensions when rip-sawing with a circular saw blade
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-0145-080X
Nanjing Forestry University, Faculty of Material Science & Engneering, Nanjing Forestry University.
Nanjing Forestry University, Nanjing Forestry University, Faculty of Material Science & Engneering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-2247-674X
Number of Authors: 42016 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 11, no 3, p. 135-141Article in journal (Refereed) Published
Abstract [en]

Curve sawing means advantages for yield and quality of sawn boards. However, for circular saw machinery deviations of saw kerfs give losses of valuable board volume. Deviations give thinner boards but also slight cupping of the cross sections. Theoretical calculations show that even with moderate (large) curve radii, these saw kerf deviations are typically 0.2–0.6 mm for normal circular saw machinery and Swedish log material. The test sawing reported here was made in order to give experimental values that can be compared to theoretical values. Fifty normal logs and 50 curved with top diameter 236–248 mm were cut with sawing pattern 3X with center boards 51 × 149 mm. The average curve radius of the curved cants that were cut in the resaw was 132 m (bow height 19 mm) and the theoretical saw kerf deviation for this radius is 0.31 mm. The experimental results show that the thickness reduction at the measuring points for curve sawn boards compared to straight sawn boards was in average 0.19 mm to be compared with the theoretical value of 0.20 mm. Cupping was more difficult to measure but results seem to agree well between theory and experiments.

Place, publisher, year, edition, pages
2016. Vol. 11, no 3, p. 135-141
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-31222DOI: 10.1080/17480272.2016.1150342ISI: 000375935000003Scopus ID: 2-s2.0-84961218673Local ID: 55774805-e94c-4e3e-b19f-bbb674543cdbOAI: oai:DiVA.org:ltu-31222DiVA, id: diva2:1004452
Note

Validerad; 2016; Nivå 1; 20160510 (andbra); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved

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Ekevad, MatsÖhman, Micael

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