Measures and yields of products and residues 



3293 



HARDWOOD LOGS, page 1954. One subsection in particular, BOLT SAW- 

 ING PATTERNS, is recommended. Also section 18-12, RIPPING AND 

 CROSSCUTTING LUMBER TO YIELD FURNITURE PARTS, page 1975, 

 contains information on yield of cuttings. One additional study is summarized in 

 the following paragraphs. 



In a study with high-quality hard maple logs (Acer saccharum Marsh)., 

 Neilson et al. (1970) found that both dollar value and surface area yield of 

 furniture components were 15 percent greater with live sawing than with grade 

 or taper sawing. Live sawing also resulted in a greater proportion of long, wide 

 cuttings (fig. 27-13). Furthermore, unedged boards produced 4 percent greater 



tip 



I* 



^^ 



^^ 



800 

 700 

 600 

 500 



400 

 300- 



200- 



100- 



800 

 700 

 600 

 500 



400 

 300 



200 

 100 



82-96 64-31 46-63 28-45 10-27 

 CUTTING LENGTH CLASS (INCHES) 



GRADE 



TAPER 



J L_J I I I_l I L 



6 55 5 4.5 4 35 3 2.5 2 2.5 

 WIDTH CLASS (INCHES) 



Figure 27-13. — Effect of sawing pattern on cutting length distribution (left) and cutting 

 width distribution (right) from unedged hard maple boards of all grades. (Drawing 

 after Neilson et al. 1970.) 



value and surface area yield than conventional or NHLA optimum edging 

 practices. The authors concluded that the combined use of live sawing and 

 unedged boards results in a 20-percent greater value yield of hardwood dimen- 

 sion stock than grade sawing followed by optimum edging. However, live 

 sawing resulted in more than three times as much surface area with edge-grain as 

 was produced with grade or taper sawing. Sawing around the log also produced 

 27 percent more surface area in sap cuttings than did live sawing; with live 

 sawing sap and mixed color cuttings were almost equal and accounted for about 

 two-thirds of the total yield. 



