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Log and Tree Sawing Times for Hardwood Mills by Everette D

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Log and Tree Sawing Times for Hardwood Mills by Everette D by Everefte DmRast -a 3 z4 Log and Tree Sawing Times 1 for Hardwood Mills USDA FOREST SERVICE RESEARCH PAPER NE-304 1974 NORTHEASTERN FOREST EXPERiMENT STATiON FOREST SERVICE, U.S. DEPARTMENT OF AGRICULTURE 68 16 MARKET STREET, UPPER DARBY, PA. 19082 F. BRYAN CLARK, STATION DIRECTOR The Author EVERETI'E D. RAST received his bachelor of science degree in forestry from the University of Missouri in 1960 and his master of science degree in agricultural economies from Ohio State University in 1970. He joined the U.S. For- est Service in 1960 as a forester on the Mendoclino National Forest and in 1966 transferred to the Northeastem Forest Experiment Station. He has served since that time as a re- search forest products technologist on the project studying quality and grade of hardwood timber at Golmbus, Ohio. ~/~~USCMPTREC FOR P~WCATION27 FDRUARU1974 ERRATA SHEET Log and Tree Sawing Times for Hardwood Mills by Everette D. Rast USDA Forest Service Research Paper NE-304 1974 Page 3, Table 2 Under Log sawing time (min.) the independent variable D should be D SQ. The regression coefficient is correct as well as Tables 5 and 6. The SQ term was omitted during printing. Under Log sawing time per Mbf. (min), the regression coefficient for the last independent variable SD > 25% is wrong. It should be 15.87645 instead of 15.51666. Therefore, Tables 8 and 10 are slightly off (see Tables 8 and Examples : Table 8 dib Log length 8 feet 12 feet 16 feet old new old new old new Log and Tree Sawing Times for Hardwood Mills ABSTRACT Data on 6,850 logs and 1,181 trees were analyzed to predict saw- ing times. For both logs and trees, regression equations were derived that express (in minutes) sawing time per log or tree and per Mbf. For trees, merchantable height is expressed in number of logs as well as in feet. One of the major uses for the tables of average saw- ing times is as a bench mark against which individual mills can make comparisons. This publication is based on a paper originally presented at the 27th Annual Meeting of the Forest Products Research Society, June 26, 1973, in Anaheim, California. sirrtrod~arctiorr log deck ready for the next log. Any delay of 20 seconds or more during the sawing of a leg Most sawmill operations are centered is recorded and deducted from the sawing around the headsaw, The headsaw is the hub, time. Sawing time is broken down into two for all other sawmill operations are geared to categories and each is analyzed from two dif- the speed with which logs are sawn. Yet many ferent standpoints. The two categories are mill owners and foremen do not know how log-sawing time and tree-sawing time, and much time it takes to saw logs of different di- each is expressed as sawing time (in minutes) mensions. Information on average log-sawing per log or tree and per Mbf. time allows mill owners to evaluate their pro- duction, to use available computer programs Before analysis, the sawing time data were to determine the dollar worth of sawlogs, to split into three groups. The first group was evaluate the time saved by a resaw, and to de- used to develop the model, the second group temine the effeet of a change in average log to obtain the coefficients for the model, and size. This infomation will also be useful in the third group to test the final model. timber appraisal. Profit is a major incentive for mill owners and it is directly related to cost (profit = rev- The factors affecting sawing time can be enue - eost); anything that reduces cost in- grouped into three main categories: creases profits. Sawing is one of the eost items; therefore, reducing the average sawing 1. Characteristics of the log or tree. time per log or per thousand board feet will 2. Type of sawmill equipment. increase profits. 3. Method of sawing and thickness pattern used. Sample Data Log or tree characteristics include species, The data on log-sawing times were collected diameter or dbh., length or merchantable during 4'7 studies conducted at 20 different height (either in feet or in number of logs), mills, of which 7 used circular saws and 13 grade, volume, form class, and scalable de- used bandsaws. Eight of the mills had resaws. fects. Some of these variables are expressed as The data cover 18 different species and 6,850 combinations of other variables; for example, logs. The data on tree-sawing times came from volume is a function of diameter, length, and 24 studies at 11 mills, of which 3 used circular form. saws and 8 bandsaws. Four of the bandsaw Under type of sawmill equipment, the pri- mills had resaws. The sample data covered 8 mary variable was type of headsaw, band or different species, 1,181 trees and 3,570 logs. circular. Other variables considered were the presence or absence of a debarker, a resaw, Procedure and a chipper. Sawing time, as used in this study, comm- Under the last category, method of sawing ences when the log is rolled oilt, onto the car- and thickness pattern, only the latter was riage and continues until the. log is c.omplrtely tested because all sawyers sawed for grade, sawn, the dog board or. i.at~tis r.t.lt~~st~t,and turning the log when the grade dropped and the carriage returns and stoils in Irt,rlt of Ihtx :~lsosetting out taper. Table I .-independent variables Logs Trees Diameter DBH Diameter breast height Length FT Merchantable heirrht in feet ,t Diameter squared NL " " no. of logs Length squared DBH SQ Diameter breast height squared FT SQ Merchantable height in feet squared NL SQ tt "no. of logs squared DBH SQ x FT DBH SQ x NL 1/DBH as dummy variable GR Giade fP tf It l/DSW SQ UD Unsound defects tr PP tt 1/FT SQ t? 11 t? N SD Soundness %/NL SQ AD All scalable defects IP ?? t9 I/DBH SQ x ET B-C Band or circular saw lf I? t? %/DBH SQ x NL TP Thickness pattern N ?I I? FM Form class IP I? I? R Presence or absence of resaw SP Species Ip tP I@ II t? I? f? IP It DB I' " debarker GR Grade CH ,I ?' ,' chipper fP I? )I UD Unsound defects N I) II SD Soundness tr I? I? AD All scalable defects ti. t? I? B-C Band or circular saw a; dyyvar!~ble TP Thickness pattern R Presence or absence of resaw tt H ?? DB Presence or absence of ,, ,, debarker t# CH Presence or absence of ,, ,, chipper U (The interaction 4erms between the dummy variables (The interaction terms between the dummy variables and a11 other variables were also formed) and all sther variables were also formed) Table 2,-Regression coeficients and associated T-values (Log sawing time) The data selected for developing the model were analyzed using the least-squares principle Independent variable T-value for fitting a multiple linear regression model. Log sauing time (rnin.) The initial selection of independent variables Intercept was made by compiling two simple correlation D matrices, one for the log data and one for the DSQxL tree data. These matrices were made up of the SQ R x L log, tree and mill characteristics (table I), Some of the variabf es are transformations and combinations of other variables and others are Log sawing lime per ,%fbf. (min.) dummy variables. Also all the interaction Intercept 14.87645 17.14"" terms between the dummy variable and all l/D SG! 619.15918 2.93* * 1/B SQ x 23624.93360 10.llx* other variables were used. With the correla- I/L SQ 844.20239 8.79" * tion matrix as a guide, the variables to be used R -8.18146 13.82" " It x 1/D SQ x -8607.90625 8.60" * in the model searching were selected. A step- SD > 25% 15.51666 19.48" * wise regression fitting procedure was used to select those independent variables that had a *: Significant at the 1 percent probability level. Significant at "ce 5 percent probability level. significant effect on the dependent variable, "" Although not significant, this term is retained sawing time. In the tree sawing time models, in the equation because its presence prevents the equations were developed using merchantable values at the sawing times of the 8 to 10-inch dia- meter logs in the 13 to 16 foot range from decreasing height both in feet and in number of logs, in value. The variables found to be significant, their regression coefficients, and the associated T- values are given in tables 2 and 3. Some of the more important factors that add variation that cannot be accounted for ad- equately are : 1. DiAFerences among the 20 mills. Table 3.-Regression coefficients and associated I-values (Tree sawing time) Merchantable height in no. of logs Merchantable height in feet Independent variable Regression Regression coefficient coefficient Tree sawing time (min.) Intercept DBH S0 DBH SQ x NL (FT) 1/DBH SQ x NL (FT) - IZ x DBH SQ R x NL (FT) Tree sawing time per Nbf. (min.) Intercept 1IDBP-I SQ * * Significant at the 1percent probability level. 3 2. Differences among the one to three dif- Sawing "e"ie~bcs!Resullt~, ferent sawyers per mill. Tests, and Discussion 3, Diflerent capacities of mills. The equations predict sawing time per log or tree better than sawing time per Mbf. In 4. Vastly different power plants, some up the log sawing time equations, the adjusted to standard and others way below.
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