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Download Bending solid wood to form by Edward C. Peck, U.S. Forest Service PDF

By Edward C. Peck, U.S. Forest Service

Wooden bending is an historic craft that's of key significance in lots of industries this present day, specially in those who manufacture furnishings, boats and ships, agricultural implements, software handles, and wearing items. Of the different equipment usual to provide curved elements of wooden, bending is the main within your means of fabric, the most efficient of contributors of excessive power, and maybe the most cost effective. lengthy event has advanced sensible bending innovations and expert craftsmen to use them. but advertisement operations usually maintain severe losses due to breakage in the course of the bending operation or the solving strategy that follows. there's a longfelt desire for extra trustworthy wisdom approximately: (1) standards for choice of bending inventory; (2) greater equipment of seasoning and plasticizing wooden for bending; (3) extra effective machines for the bending operation; (4) suggestions for drying and solving the bent half to the specified form; and (5) the impact of bending at the energy houses of wooden.

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S. DEPT. OF AGRICULTURE It is not perfectly understood just why actual bending results exceed the expected when the bending radius is calculated by formula (11). The value of ec is probably conservative, however, because of the method used in making the endwise-compressibility test. A zone of weakness in the block used in the endwise-compressibility test will tend to lower the value of ec, while a similar zone of weakness may have little influence on bending failure, unless it happens to be located on or near the concave face.

The zones of maximum compression fall to the right and left of the center of the arc, but from 1 to 2 inches away from the center point. The pieces were clamped to the form at the center before bending commenced. The clamp may have increased the friction between the stick, the form, and the strap in the central portion. The increased friction may have prevented the central portion from assuming the full amount of compressive strain. The compressive strain was not restricted to the curved portion of the stick but extended for about 1½ inches along each straight leg.

The compressive strain was not restricted to the curved portion of the stick but extended for about 1½ inches along each straight leg. 14 inches. 97 inches. 979 inch. 14 inches. 15 inch, which may have been due to shear strain. —Distribution of compressive strain in a bent stick. The mean measurements for 11 sticks are shown. U. S. GOVERNMENT PRINTING OFFICE: 1957-429172 For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C.

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