Machining and Related Characteristics of United States Hardwoods
Machining and Related Characteristics of United States Hardwoods \ Teclmicai IÍMIM^IíU íI>. Forest Service Machining and Related Characteristics of United States Hardwoods By E. M. DAVIS, Wood Technologist, Forest Products Laboratory (Maintained at Madison, Wis., in cooperation with the University of Wisconsin) Technical Bulletin No. 1267 U.S. DEPARTMENT OF AGRICULTURE • FOREST SERVICE Washington, D.C. August 1962 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. - Price 35 cents CONTENTS Page Introduction 1 Machining properties 3 Planing 3 Shaping 20 Turning 23 Boring 26 Mortising 31 Sanding 35 Related properties 39 Steam bending 39 Nail splitting 43 Screw splitting 45 Variation in specific gravity 49 Number of annual rings per inch 53 Cross grain 53 Shrinkage 56 Warp 56 Minor imperfections of hardwoods 59 Change of color in hardwoods 63 Summary 64 This bulletin supersedes Technical Bulletin No. 824, Machining and Related Characteristics of Southern Hardwoods. HI INTRODUCTION Machining properties relate to the behavior of wood when planed, shaped, turned, or put through any other standard woodworking operation. Wood in general is easy to cut, shape, and fasten. For some purposes the difference between woods in machinability is negli- gible ; for other uses, however, as in furniture and fixtures, the smooth- ness and facility with which woods can be worked may be the most important of all properties. Unless a wood machines fairly well and with moderate ease, it is not economically suitable for such uses re- gardless of its other virtues. Thus, along with specific gravity and tendency to split and warp, machinability is of first importance to the woodworker.
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