» 
 
 ■, \ \ \ \ 1 
 
 .US213( Power)* 
 
 FOREST PRODUCTS LABORATORY t FOREST SERVICE 
 U. S. DEPARTMENT OF AGRICULTURE 
 
 SMALL SAWMILL IMPROVEMENT 
 
 PRACTICAL POINTERS TO FIELD AGENCIES 
 
 Summary of 
 
 TESTS ON POWER USED ON INSERT-POINT CIRCULAR IIEADSAVfS 
 
 
 The users of insert-point circular headsaws are guided by saw manufacturers 
 plus their own experience in selecting headsaws of the diameter, gage, style, 
 and number of teeth, width of bits, operable speeds, and probable horsepower 
 requirements suited to their needs. A series of tests has been made by the 
 Forest Products Laboratory for the purpose of relating this guidance to defi- 
 nitely measurable effects. The forces used in sawing were determined by use 
 of recording instruments, and could readily be converted in terms of horse- 
 power where desired. The test results of direct interest to saw users follow: 
 
 1. Dull teeth required 8 percent more horsepower than did sharp teeth. 
 
 2. A saw having a wobble of the rim or teeth and holders out of line so as to 
 score the board face with definite ridge and groove pattern used 11 percent or 
 more horsepower than did a smooth cutting saw. These observations emphasize 
 the handicap in using a dull saw or one that visibly scores the cut faces. 
 
 3. The horsepower required varied directly with the diameter, a 5-foot 
 diameter saw requiring l/p more horsepower than a U-foot diameter saw. This 
 further substantiates the use of a saw no larger than required to reach 
 through the largest logs encountered. 
 
 U. The horsepower increased with the number of teeth (2-1/2 style) by approxi- 
 mately 1 percent for each additional tooth. 
 
 5. The E stjrle tooth required 6-1/2 percent more horsepower than the No. 3 
 style, each saw with LO teeth; the 2-1/2 style with L8 teeth required 38 per- 
 cent more horsepower than the No* 3 style with LO teeth. Other styles were 
 not tested. It seems probable that style is less important than number of 
 teeth and that in increasing the number of teeth th o hnr^fipnv'pr requirem ents 
 are increased. •»■..,,. , ._ „ 
 
 HUME LIBRARY 
 
 6. On an 8-gage saw having shanks of a maximum thickness of 0.20^ inch 
 (13/6L inch full) bits 7/32 inch in width were inad< quate, 8/^2 inch requin 
 the least horsepower, 9/32 inch used \\Z percent, anc 10/32 M£ttth«Ji*s4<$ 725 P e r 
 cent more horsepower than did the 8/32 inch bits, 'his indicates the desir 1- 
 bility of using the narrowest bits that permit ef f i< lent saw operation, 
 
 ■•r.i 1.0. ■ o,.,v. of Florida 
 
 7. An increase in horsepower developed when g 11 " 1 "* ^ + <*~™**™*- ^v.^-r] n^'j ed with 
 sawdust. Overloading developed when the gullet area was less than 2.$ the 
 wood area for oak and ash, or 2 # U for Douglas-fir. Overloading was not 
 perceptible when these relationships were 2.3 for cheny, 2.2 for bass^ood, 
 elm, and cottonwood, and 2.1 for soft maple. As mills install higher capacity 
 
 Rept. No. R899-26 
 
 -1- 
 
 t Maintained at Madison, Wisconsin in cooperation with the University of Wisconsin 
 
 •See outline in Small Sawmill Improvement Working Plan, March 1930, for explanation of indexing system proposed 
 
power units, the capacity of the gullet to chamber sawdust properly places 
 
 a ceiling on feed rates and disqualifies saws having relatively small gullets. 
 
 8. Excluding the horsepower used to run the machinery, the horsepov r er con- 
 sumed by cutting was proportionately less as speed increased* It increased 
 directly with the rate of feed at rates of fewer than 16 teeth per inch and 
 directly with the cutting depth, and density (specific gravity) of the wood. 
 
 Tables 1, 2, and 3 give definite measurements of the effects of saw speeds, 
 feed rates, cutting depths, and wood densities. The average densities 
 (specific gravity) for species when green are given in the reference listed. 
 The tests upon which the tables are based were made with a saw I46 inches in 
 diameter having UO B-style teeth with bits 9/32 inch in width. 
 
 Contributed by: 
 C. J. Telford, Small-mill Specialist 
 Forest Products Laboratory- 
 Madison £, Wisconsin 
 
 March 19h9 
 
 Rept. No. R899-26 -2- 
 
Table 1. — Cutting ho rsepowe r exclusive of m achine loss horsc pover— 
 (Speed of saw = 300 r.p.m. ) 
 
 Bite per 
 
 : Carriage feed 
 
 : Specific 
 
 
 Depth ( 
 
 jf cut — 
 
 inches 
 
 
 tooth 
 
 : for a i;0- 
 
 : gravity^ 
 
 
 
 
 
 
 
 
 
 
 
 
 : tooth saw 
 
 
 : 10 
 
 : 12 
 
 : 1U 
 
 : 16 
 
 1 
 
 Inch 
 
 : Ft. per rain. 
 
 
 ! !!£. 
 
 : Hp_. 
 
 j Hp_. 
 
 Hp_. 
 
 : [p. 
 
 0.03 
 
 i 30 
 
 i 0.3 
 
 ! i.u 
 
 I i*.i 
 
 : 6.8 
 
 I 9.5 
 
 . 12.3 
 
 •Oii 
 
 i 1-0 
 
 : .3 
 
 2.0 
 
 : U.8 
 
 : 7.7 
 
 10.5 
 
 13. 1* 
 
 .06 
 
 s 60 
 
 : .3 
 
 : 3.1 
 
 : 6.1 
 
 : 9.2 
 
 12.2 
 
 . 15.3 
 
 .06 
 
 ; 80 
 
 : .3 
 
 Jul 
 
 : 7.3 
 
 : 10.5 
 
 ! 13. C 
 
 ! 17.0 
 
 .10 
 
 : 100 
 
 > • j 
 
 : 5.1 
 
 : 8.5 
 
 : 11.9 
 
 \ 15.3 
 
 : 18.7 
 
 .12 
 
 : 120 
 
 
 6.1 
 
 ! 9.7 
 
 : 13.3 
 
 : 16.9 
 
 : 20. k 
 
 .13 
 
 : 130 
 
 s .3 
 
 6.6 
 
 10.2 
 
 . 13.9 
 
 17.5 
 
 . 21.2 
 
 .03 
 
 : 30 
 
 i .h ; 
 
 3.6 
 
 ! 6.7 
 
 : 9.9 
 
 13.0 
 
 16.2 
 
 .01; ! 
 
 : U0 
 
 ! .1* 1 
 
 5.1 
 
 i 8.5 
 
 : 12.0 
 
 : 15.U 
 
 . 13.9 
 
 ,06 
 
 : 60 
 
 : ,1* i 
 
 8.0 
 
 12.0 
 
 : 16.1 
 
 : 20.1 
 
 : 21*. 2 
 
 .08 
 
 i 80 
 
 : .h : 
 
 10.5 
 
 l5.o 
 
 : 19.6 
 
 : 2h.l 
 
 : 28.7 
 
 .10 
 
 100 
 
 : .1* > 
 
 13.0 
 
 i 18.0 
 
 : 23.1 
 
 : 28.1 
 
 : 33.2 
 
 .12 
 
 : 120 
 
 ; .1* : 
 
 
 21.0 
 
 : 26.6 
 
 32.1 
 
 • 37.7 
 
 .13 
 
 130 
 
 : .U : 
 
 16. ! 
 
 : 22.6 
 
 : 28. h 
 
 : 3U.2 
 
 : 1*0.0 
 
 .03 ■ 
 
 30 
 
 .5 ! 
 
 5.8 ; 
 
 9.h 
 
 13.0 
 
 16.6 
 
 20.2 
 
 .01* : 
 
 ho 
 
 .5 i 
 
 8.1 
 
 11.9 
 
 : 15.7 
 
 19.5 
 
 23.3 
 
 .06 ! 
 
 60 s 
 
 .5 : 
 
 12 . 8 • 
 
 17. ' 
 
 22.8 
 
 27.8 
 
 . 32.8 
 
 .08 i 
 
 80 i 
 
 i .5 : 
 
 16.S 
 
 22.7 
 
 2 jo 
 
 3U.3 
 
 1*0.1 
 
 .10 : 
 
 100 ; 
 
 .5 : 
 
 20.? : 
 
 27.5 
 
 3U.1 
 
 U0.7 
 
 1*7.1* 
 
 .12 ! 
 
 120 ! 
 
 .5 : 
 
 25.0 : 
 
 32. h 
 
 39.9 
 
 1*7.3 
 
 51*. 8 
 
 .13 : 
 
 130 ; 
 
 .5 : 
 
 27.1 ! 
 
 3U.9 
 
 : U2.8 
 
 50.6 
 
 • 56.5 
 
 •03 I 
 
 30 i 
 
 .6 i 
 
 8.0 \ 
 
 12.0 
 
 16.1 
 
 20.1 
 
 21*. 2 
 
 • 0U : 
 
 1*0 : 
 
 .6 j 
 
 11.2 i 
 
 15.9 i 
 
 20,6 : 
 
 25.3 
 
 29.9 
 
 .06 i 
 
 60 i 
 
 . .6 ; 
 
 17.6 : 
 
 23.5 
 
 29.5 s 
 
 35.h 1 
 
 1*1.1* 
 
 .08 i 
 
 60 : 
 
 .6 i 
 
 23.2 ! 
 
 30.3 
 
 37. 1* ■ 
 
 hh.5 : 
 
 51.5 
 
 .10 : 
 
 100 i 
 
 .6 : 
 
 28.8 ; 
 
 37.0 • 
 
 1*5.2 : 
 
 53. h : 
 
 61, 
 
 .12 : 
 
 120 ! 
 
 .6 : 
 
 3U.2* : 
 
 1*3.7 
 
 53.1 
 
 62. h : 
 
 71.8 
 
 .13 ! 
 
 130 : 
 
 .6 j 
 
 37.3 : 
 
 1*7.2 
 
 57.1 
 
 67.O 
 
 76.9 
 
 .03 ! 
 
 30 1 
 
 .65 ! 
 
 9.1 
 
 13.3 
 
 17.6 
 
 21. C : 
 
 26.1 
 
 .01* : 
 
 1*0 i 
 
 .65 j 
 
 12.o ; 
 
 17.8 : 
 
 22.8 : 
 
 27.8 
 
 32,8 
 
 .06 : 
 
 60 j 
 
 .65 : 
 
 20.0 : 
 
 29.3 
 
 38.6 i 
 
 1*7.9 : 
 
 57.3 
 
 .08 j 
 
 80 j 
 
 .65 j 
 
 26.1* i 
 
 36.2 
 
 1*6.0 ! 
 
 5$.i ! 
 
 oS.$ 
 
 .10 j 
 
 100 ! 
 
 .65 : 
 
 32.8 ; 
 
 1*3.0 . 
 
 53.2 : 
 
 63. h '. 
 
 13.1 
 
 .12 ; 
 
 120 ! 
 
 .65 : 
 
 39.2 ! 
 
 1*9.9 : 
 
 60.6 : 
 
 71.3 : 
 
 81.9 
 
 .13 1 
 
 130 i 
 
 .65 i 
 
 li2.U : 
 
 53.3 i 
 
 614.2 s 
 
 75.1 1 
 
 86.1 
 
 -Add idling horsepower = 1*.1*3 horsepower; add 2 horsepower for carriage pull 
 
 on the saw. 
 
 2 
 
 —Use specific gravities for oven-drj material based on volurae at tine of test 
 
 as given in U.S. Department of Agriculture Tech. Hull. No. 1*79. 
 Kept. No. R399-26 
 
Table 2 . — Cutting horsepower exclusive of machine loss ho rs epower- 
 (Speed of saw = 1*50 r.p.m. ) 
 
 Bite per 
 
 i Carriage feed 
 
 : Specific 
 
 
 Depth of cut — inches 
 
 
 tooth 
 
 : for a 1*0- 
 i tooth saw 
 
 : gravity^. 
 
 
 
 
 
 
 t- \S\J U - I 
 
 : 10 
 
 : 12 
 
 : Hi s 
 
 16 : 
 
 13 
 
 Inch 
 
 ' Ft. per min. 
 
 
 ! Hp_. ! 
 
 I H£. 
 
 : Ho. ' 
 
 Hp_. 
 
 Hj>. 
 
 C.03 
 
 ! h$ 
 
 . 0.3 
 
 ! 1.8 
 
 ! 5.5 
 
 : 9.3 
 
 13.0 
 
 16. 8 
 
 .01; 
 
 : 60 
 
 ! .3 
 
 : 2.6 
 
 : 6.5 
 
 : 10. a 
 
 1U*3 
 
 18.3 
 
 .06 
 
 ! 90 
 
 : .3 
 
 : U.U 
 
 : 8.7 
 
 : 13.0 
 
 17.2 
 
 21.5 
 
 .08 
 
 ; 120 
 
 : .3 
 
 : 5.8 
 
 : 10.3 
 
 1U.9 
 
 . 19. 1* 
 
 21*. 
 
 .10 
 
 : 150 
 
 \ .3 
 
 1 7.2 
 
 : 12.0 
 
 ; 16.8 
 
 : 21.6 
 
 26.5 
 
 .12 
 
 : 150 
 
 .3 
 
 . 8.6 
 
 1 13.7 
 
 : 18.8 
 
 : 23.9 
 
 . 29. c 
 
 .13 
 
 195 1 
 
 : .3 
 
 : 9.3 
 
 : 11*. 5 
 
 : 19.8 
 
 ! 25.0 
 
 30.3 
 
 .03 : 
 
 U5 
 
 ,u ! 
 
 U.6 
 
 ! 8.9 
 
 , 13.2 
 
 17.5 
 
 21.9 
 
 .01* ! 
 
 60 i 
 
 .1* 
 
 i 6.7 
 
 . ll.l* 
 
 : 16.2 
 
 i 20.9 
 
 25.7 
 
 .06 : 
 
 90 i 
 
 .1* 
 
 11.1 
 
 i 16.7 
 
 : 22.3 
 
 : 27.9 
 
 : 33.6 
 
 .08 : 
 
 120 : 
 
 .1* 
 
 Hi. 6 
 
 20.9 
 
 . 27.3 
 
 33.6 
 
 1*0.0 
 
 .10 : 
 
 1^0 ! 
 
 .It 
 
 18.1 
 
 : 25.2 
 
 1 32.3 
 
 : 39.3 
 
 : lt6.li 
 
 .12 : 
 
 180 : 
 
 .h ! 
 
 21.6 s 
 
 29. h 
 
 1 37.2 
 
 : U5.0 
 
 • 52.8 
 
 .13 : 
 
 195 ' 
 
 .h i 
 
 23.5 
 
 31.6 
 
 : 39.7 
 
 : 1*7.8 
 
 crcr 
 
 .03 I 
 
 u5 ! 
 
 .5 
 
 7.3 
 
 12.1 
 
 17.0 
 
 : 21.8 
 
 26.7 
 
 .01* : 
 
 60 j 
 
 .5 1 
 
 10.7 
 
 1 16.2 
 
 : 21.8 
 
 : 27.3 
 
 ; 32.9 
 
 .06 : 
 
 90 : 
 
 .5 : 
 
 17.8 
 
 . 3ii.7 
 
 31.7 
 
 : 38.6 
 
 1*5.6 
 
 .08 : 
 
 120 ; 
 
 .5 
 
 23.5 
 
 31.6 
 
 39.7 
 
 147.8 
 
 55.9 
 
 .10 : 
 
 150 : 
 
 .5 J 
 
 29.2 
 
 38.li. 
 
 1 1*7.7 
 
 . 56.9 
 
 66.2 
 
 .12 : 
 
 180 : 
 
 
 3h.9 
 
 • 1*5.3 
 
 : 55.7 
 
 : 66.1 
 
 76.5 
 
 .13 i 
 
 195 'J 
 
 .5 
 
 37.8 . 
 
 1*8.7 
 
 . 59.7 
 
 70.6 
 
 ; 81.6 
 
 .03 : 
 
 h$ ! 
 
 .6 ; 
 
 10.1 ! 
 
 15.5 
 
 20.9 ' 
 
 26.3 
 
 31.8 
 
 .01; : 
 
 60 : 
 
 .6 1 
 
 11*. 7 
 
 21.0 
 
 . 27. h 
 
 33.7 
 
 U0.1 
 
 .06 : 
 
 90 : 
 
 .6 
 
 21;. 6 
 
 32.9 
 
 1 U.2 
 
 U9.5 
 
 57.9 
 
 .08 ; 
 
 120 : 
 
 .6 j 
 
 32.5 
 
 U2.li 
 
 52.3 
 
 62.2 
 
 72.1 
 
 .10 : 
 
 150 : 
 
 .6 : 
 
 l*o.l* 
 
 51.8 
 
 63.3 
 
 7U.7 
 
 86.2 
 
 .12 : 
 
 180 : 
 
 .6 
 
 1*8.2 
 
 , 61.2 
 
 7U.2 
 
 87.2 
 
 100.3 
 
 .13 : 
 
 195 1 
 
 .6 
 
 52.1 
 
 65.9 
 
 . 79.7 
 
 93-5 
 
 107.1* 
 
 .03 i 
 
 h$ ! 
 
 .65 I 
 
 11.5 
 
 1 
 17.2 
 
 22.9 
 
 28.6 
 
 3U.3 
 
 .01| : 
 
 60 ! 
 
 .65 : 
 
 16.8 
 
 23.5 
 
 30.3 
 
 37.0 
 
 1*3.8 
 
 ,06 i 
 
 90 : 
 
 .65 
 
 25.0 
 
 37.0 
 
 i I46.O 
 
 : 55.0 
 
 : 61*. 
 
 .08 ; 
 
 120 : 
 
 .65 
 
 36.9 
 
 U7.7 
 
 i 58.5 
 
 : 69.3 
 
 80.1 
 
 .10 : 
 
 150 : 
 
 : .65 
 
 1*5.8 
 
 • 58.U 
 
 ! 71.0 
 
 O.6 
 
 : 96.1 
 
 .12 : 
 
 180 : 
 
 .65 
 
 5U.7 
 
 69.0 
 
 : 83.14 
 
 : 97.7 
 
 : 112.1 
 
 .13 I 
 
 195 
 
 .65 
 
 i 59.2 
 
 . 7U.U 
 
 1 89.7 
 
 ! 10U.9 
 
 : 120.2 
 
 —Add idling horsepower = 6.61* 
 
 pull on the saw. 
 
 2 
 
 "Use specific gravities for oven 
 
 as given in U. 5. Department 
 Kept. No. R899-26 
 
 horsepo- er; add 3 horsepower for carriage 
 
 -dry material based on volume 
 of Agriculture Tech. Bull. L'o. 
 
 at time of test 
 U79. 
 
 
Table 3 »— ■Cutting horsepowur exclusive of machine loss horsepower— 
 
 
 (Speed of 
 
 saw = 600 r 
 
 .p.m.) 
 
 
 
 
 
 Bite per 
 
 : Carriage feed 
 
 : Specific 
 
 
 Depth of cut — 
 
 inches 
 
 
 tooth 
 
 : for a 1*0- 
 
 : gravity^ 
 
 
 
 
 
 
 
 
 
 
 
 
 J tooth saw 
 
 
 s 10 
 
 12 
 
 Hi 
 
 ; 16 
 
 18 
 
 Inch 
 
 : Ft. per min. 
 • 
 
 
 : Hp_. 
 
 ; Ho. 
 
 Hp. 
 
 : Hp_. 
 
 Eg. 
 
 0.03 
 
 : 60 
 
 i 0.3 
 
 : 1.9 
 
 i 6.5 
 
 : 11.1 
 
 S 15.7 
 
 : 20.2 
 
 •01* 
 
 : 80 
 
 ! .3 
 
 : 3.0 
 
 : 7.8 
 
 : 12.6 
 
 : 17.ii 
 
 : 22.2 
 
 .06 
 
 t 120 
 
 i .3 
 
 : 5.U 
 
 : 10.7 
 
 : 16.0 
 
 : 21.3 
 
 : 26.5 
 
 .08 
 
 t 160 
 
 : .3 
 
 \ 7.1 
 
 : 12.7 
 
 i 18.3 
 
 : 23.9 
 
 : 29.6 
 
 .10 
 
 5 200 
 
 ; .3 
 
 : 8.8 
 
 : lh. 6 
 
 : 20. G 
 
 : 26.7 
 
 : 32.7 
 
 .12 
 
 : 2U0 
 
 ! .3 
 
 i 10.5 
 
 16.8 
 
 23.1 
 
 : 29.il 
 
 35.8 
 
 ,13 
 
 s 260 
 
 i t 
 
 : .3 
 
 : ll.U 
 
 17.9 
 
 2li.li 
 
 : 30.9 
 
 37.3 
 
 .03 
 
 t i 
 
 \ 60 
 
 .h 
 
 \ h.9 I 
 
 10.1 : 
 
 15.3 
 
 : 20.5 
 
 25.6 
 
 .024 
 
 I 80 
 
 
 ! 7.7 : 
 
 13. U J 
 
 19.2 
 
 : 2U.9 . 
 
 30.7 
 
 .06 
 
 5 120 j 
 
 • 4 
 
 i 13.7 : 
 
 20.6 : 
 
 27.6 
 
 : 3U.5 
 
 : ia. 5 
 
 .08 
 
 ! 160 : 
 
 .u 
 
 16.1 : 
 
 25.9 : 
 
 33.7 
 
 i 1*1.5 : 
 
 i 1*9.3 
 
 .10 
 
 I 200 i 
 
 .1* 
 
 : 22.5 : 
 
 31.1 : 
 
 39.6 
 
 : Ji-8.1i i 
 
 57.1 
 
 .12 
 
 ! 21*0 : 
 
 1, 
 
 • 4 
 
 26.9 : 
 
 36.1* : 
 
 1*5.9 
 
 : 55.1* 
 
 65.0 
 
 .13 
 
 ! 260 ; 
 
 .h 
 
 29.0 : 
 
 39. C : 
 
 19.0 
 
 . 59.0 ; 
 
 69.0 
 
 .03 
 
 \ 60 i 
 
 • 5 
 
 1 7.8 ! 
 
 13.5 : 
 
 19.3 
 
 ! 25.0 ■ 
 
 30.8 
 
 •Oli 
 
 : 80 i 
 
 .5 i 
 
 12.3 : 
 
 18.9 : 
 
 25.6 i 
 
 32.2 : 
 
 38.9 
 
 .06 
 
 : 120 ; 
 
 .5 i 
 
 22.0 : 
 
 30.6 ! 
 
 39.2 
 
 1*7.6 : 
 
 56.1* 
 
 .08 ! 
 
 : 160 j 
 
 
 29.0 : 
 
 39.0 : 
 
 1*9.0 ! 
 
 59.0 ! 
 
 69.0 
 
 .10 
 
 : 200 : 
 
 .5 i 
 
 35.0 : 
 
 1*7. U i 
 
 58.8 i 
 
 70.2 : 
 
 81. 6 
 
 .12 
 
 i 21*0 : 
 
 • 5 ! 
 
 1*3.0 : 
 
 55.6 i 
 
 68.6 i 
 
 81. 1* : 
 
 9U.3 
 
 .13 i 
 
 4 
 
 ! 260 ! 
 
 .5 i 
 
 1*6.6 i 
 
 60.1 : 
 
 73.6 - 
 
 87 . 1 : 
 
 100.7 
 
 .03 
 
 i i 
 
 I 60 : 
 
 .6 1 
 
 10.8 : 
 
 17.1 i 
 
 23.5 ! 
 
 29.0 i 
 
 36.2 
 
 .01* 
 
 ! 80 : 
 
 .6 ! 
 
 17.0 : 
 
 2h.6 i 
 
 32.2 
 
 39. C s 
 
 1*7.1* 
 
 .06 
 
 ! 120 ; 
 
 .6 : 
 
 30. U : 
 
 hO. 7 : 
 
 51.0 i 
 
 61.3 : 
 
 71.5 
 
 .08 
 
 i 160 ; 
 
 .6 : 
 
 1*0.1 : 
 
 52.3 i 
 
 6U.5 
 
 . 76.7 : 
 
 88.9 
 
 .10 
 
 ! 200 ! 
 
 .6 : 
 
 1*9.6 i 
 
 63.9 i 
 
 78.0 
 
 92.1 : 
 
 106.3 
 
 .12 
 
 : 21*0 : 
 
 .6 : 
 
 59.5 s 
 
 75.5 i 
 
 91.6 
 
 107.6 : 
 
 123.7 
 
 .13 
 
 : 260 : 
 
 .6 
 
 6U.3 i 
 
 81.3 : 
 
 98.1* 
 
 115. ii : 
 
 132.5 
 
 .03 i 
 
 60 i 
 
 .65 ! 
 
 12.3 : 
 
 18.9 : 
 
 25.6 \ 
 
 32.2 : 
 
 38.9 
 
 '.Oli : 
 
 : 80 : 
 
 .'-5 : 
 
 19. h i 
 
 27»5 : 
 
 35.6 ; 
 
 1*3.7 : 
 
 51.7 
 
 .06 i 
 
 ! 120 ! 
 
 .65 1 
 
 3);.5 i 
 
 1*5.6 i 
 
 56.7 : 
 
 67.8 : 
 
 78.9 
 
 .08 i 
 
 i 160 : 
 
 .65 : 
 
 h$.$ i 
 
 53.8 ; 
 
 72.1 : 
 
 85.1: : 
 
 98.7 
 
 .10 ! 
 
 I 200 : 
 
 .65 : 
 
 56.5 : 
 
 72.0 : 
 
 87.5 i 
 
 103.0 : 
 
 118.6 
 
 .12 ! 
 
 : 21*0 j 
 
 .65 : 
 
 67.5 : 
 
 65.2 : 
 
 102.9 : 
 
 120.6 j 
 
 138.1* 
 
 r- •«. < 
 
 260 ; 
 
 .65 : 
 
 73.1 : 
 
 91.9 : 
 
 110.7 : 
 
 129.5 J 
 
 11*8.1* 
 
 -Add idling horsepower = 6,85; add 1* horsepower as maximum for carriage pull 
 on the saw. 
 
 2 
 
 —Use specific gravities for oven-dry material based on volume at time of test 
 
 as given in U. S. Department of Agriculture Tech. Bull. No. 1*79. 
 Rept. No. R899-26 
 
UNIVERSITY OF FLOR'D* 
 
 mmg& 
 
 3 1262 08926 8543 
 
 -• -. -