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 4^-; , * FOREST PRODUCTS LABORATORY 1 FOREST SERVIC 
 
 U. S. DEPARTMENT OF AGRICULTURE 
 
 ">M|\LL SAWMILL IMPROVEMENT 
 
 PRACTICAL POINTERS TO FIELD AGENCIES 
 
 75l?? pG TANKS Alfp TPUCK-IOADIITG SCAFFOLDS 
 
 Sap stained lumber loses markets in competition with bright lumber. 
 Small mills have been losing these markets because small production has not 
 warranted the installation of large boilers, kilns, or dipping vats effective 
 in stain control. The recent workof the Division of Forest Pathology, Bu- 
 reau of Plant Industry, at the Southern Forest Experiment Station, from whom 
 further information can be obtained on cold dips, has opened to the small 
 mills an opportunity to put out bright lumber. This development practically 
 means that the small mills will either have to dip or discontinue cutting 
 stain-susceptible timber as some progressive concentration yards are buying 
 only dipped lumber and every mill dipping hastens the time when the consumer 
 can completely fill his requirements from unstained lumber. 
 
 The following recommendations as to equipment and layouts for dip- 
 ping at the portable typo of mill apply where prompt trucking from saw to con- 
 centration yard is practiced. Dipping is done after the final sawing. (Fig. 1) 
 The tail edge man slides the lumber into the dip over a roller that is at- 
 tached at the same height as the top of the edger table to the end of a long 
 narrow tank containing the dip. The level of the dip is kept about 4 inches 
 from the top of the tank, that is, 24 inches from the ground. The lumber is 
 removed from the tank immediately by one man who lifts ^e end of a board 
 out of the tank, pivots the board on a roller alongside the tank, pauses an 
 instant to expedite dripping, and then slides the board over another roller 
 to a scaffold. The scaffold supports hold the lumber nigh enough for a 
 truck to be backed underneath. (Fig. l) Blocks are so fitted to the high 
 end of the scaffold supports that they can be knocked out r thus bringing one 
 end of the lumber pile down into the truck. The truck is then started and 
 the other end of the lumber pile pulled entirely free of the scaffold. The 
 whole operation requires the services of only one man beyond the tail edger- 
 man and the use of about 15 gallons of liquid to each thousand board feet of 
 lumber dipped. 7/here rehandling is practiced, such as yard drying or bulk 
 piling direct from the saw into box cars, the lumber is placed on dollies 
 instead of scaffolds. 
 
 Tank materials are 8/4-inch pl ank 17 inp 1 "^ Tijr 17 f rr t for each side, 
 one plank 16 inches by 17 feet for tpe bptto^, V^Q^A F*Y rt l end - pieces or 
 narrower plank wicking caulked at jolnnOfcttW .iftl^cMSe widths. Two 4 by 4- 
 inch by 17-foot braces held in placelby 1-inch rods clamped kt the ends rein- 
 force the sides, and strips 1 by 4 ilehes byl7 faet jailed Lo the top edge of 
 the side minimize splash waste. (Fii. 4) vhe T ^rik 'rin7 felt long, 20 inches 
 wide at the top, 12 inches wide at tile bottom, and 16 inches Ideep. A tight 
 tank is attained by bevelling the sidLs at contact with the Bottom, indenting 
 
 or grooving slightly, packing the groL^/\v§th ^TOVi^'^^J 112 the side 
 
 boards 3/8-inch deep for the ends, HTirnr'i re ~imt p i_ lh i mi - at junction 
 
 with sides and bottom, and fastening together with lag screws. (Fig. 4) The 
 scaffold dimensions apply where 1-1/2 ton trucks are used, but the blocking 
 shown in Figure 3 can be increased or decreased to suit other truck heights. 
 F899-6 Contributed by C.J.Telford, 
 
 Small-Mill Specialist, 
 Forest Products Laboratory, 
 
 t Maintained at Madison, Wisconsin in cooperation wiih the University ol Wisconsin December 1931. 
 
 • See outline in Small Sawmill Improvement Working Plan, March 1930, for explanation ol indexing system proposed. 
 
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to 
 
 f 
 
 I I MILL noon? \ || \\1 I I 
 
 — 7-6 TO 
 
 EDGER TABLE 
 
 GROUND L I HE -* 
 
 FIG. I- SIDE VIEW OF TANK AND SCAFFOLD 
 
 .D I 
 
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 I 
 
 if 
 
 : 
 
 4UJ 
 
 /W/£i FLOOR 
 
 FIG.2-T0P VIEW OF TANK AND SCAFFOLD 
 
 
 ROLL 
 
 AC SCREWS 
 ON BOTTOM 
 
 FIG. 3- SCAFFOLD DETAILS 
 
 (groove 
 FIG. 4 -TANK PE TAILS 
 
 » 
 
UNIVERSITY OF FLUKIUA 
 
 3 1262 09216 2857