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The Hawkindales are a set of angles that describe the compound intersection of beams in hip and valley roofs. They were developed by Rees Acheson for Benson Woodworking, building on work done at the turn of the century appearing in Martindale's steel detailing handbook (see the accompanying background material). Instructions for Using the Hawkindale SpreadsheetThe Hawkindale spreadsheet is set up for analysis of hips and valleys over right angle wall corners (that is, it will handle irregular pitch, but not irregular plan, roofs). We hope soon to post a revised file that will also deal with non-orthogonal corners. The prudent user will save the original worksheet file as a template and make copies for use in individual projects. Novice users may wish to first review the accompanying background material taken from the Hip & Valley article series in Timber Framing. Click to download a zipped version of the Lotus and Excel spreadsheets and instructions. (Note: You need software to unzip these files. Mac users can use the latest version of StuffIt and others can use Winzip.) September 2004 Update: Ed Levin has supplied an updated Hawkindale worksheet, which is the version of the sheet that appeared in print in Figure 18 on p. 22 of issue 70 of Timber Framing. It includes a short paragraph of directions for use. Most of the cells in the spreadsheet are protected and cannot/should not be altered. Data entry is restricted to the following three cells:
Note that run is identical for main and adjacent slopes. By convention, it is usually set to 12, although any positive number will do. When determining the above quantities, keep in mind the following relationships: W = DD + DWhen W = 90°, DD = Arctan[Tan(S) / Tan(SS)] In regular pitch, regular plan roofs, only one set of Hawkindales is required (main = adjacent). If either plan or pitch is irregular (but not both), you will need both main and adjacent angle sets. If both plan and pitch are irregular, see your psychotherapist. Please click on each of the 9 thumbnails below to view and print out the angles in glorious black & white. If you want a higher-resolution version of these images, we have split the 9 high-resolution files across two zip archives to speed the download time and to let you try downloading part before getting the whole thing. Be forewarned, however, that one file is 700K and the other is 900K. These 2 files total 1.5 megabytes zipped and will expand to 9 files totaling 24 megabytes. The 9 files contain images scanned at 600 dpi resolution into TIFF format. (All drawings courtesy of Ed Levin.) | ||||||||||||||||
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