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    Author(s): William T. Simpson; John R. Shelly
    Date: 2000
    Source: (Research note FPL ; RN-0273):3 p. : ill. ; 28 cm.
    Publication Series: Research Note (RN)
    Station: Forest Products Laboratory
    PDF: Download Publication  (100 KB)


    Warp in lumber is a common problem that occurs while lumber is being dried. In research or other testing programs, it is sometimes necessary to compare warp of different species or warp caused by different process variables. If lumber dimensions are not the same, then direct comparisons are not possible, and adjusting warp to a common dimension would be desirable so that these comparisons are possible. In this report, two methods of adjusting warp to different dimensions are developed2one based on the geometry of bow and crook and another based on the geometry of twist. These methods provide a way to adjust crook and bow measurements to a different length and to adjust twist to a different length or width so that comparisons are possible.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Simpson, William T.; Shelly, John R. 2000. Method for adjusting warp measurements to a different board dimension. (Research note FPL ; RN-0273):3 p. : ill. ; 28 cm.


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    Lumber--Drying, Wood--Preservation, Lumber, Wood products, Kiln drying, Warping, Wood defects, Measurement, Dimensions, Adjustment, Methodology

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