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The Roller Blades
Roller CategoriesTo assist readers who wish to make their own imprinters, specifications are given in U.S. Customary (English) units. The structural steel used to fabricate imprinters is available in these units. Conversion factors are given for the convenience of those working in countries where steel has metric dimensions.
Six categories of imprinting rollers result from various combinations of 2 angle sizes (6"x 6" & 8" x 8"), 2 angle shapes (straight and bowlegged) and two cylindrical core diameters (20" & 24"). Category specifications are given in the table below. Angular teeth are welded radially around the core to form 6 or 8 pointed star rings. Tooth length is 10 inches and the spacing between rings is about 2 inches. Thus, there is one star ring for each 12 inches of imprinting roller length. Points on adjacent star rings are staggered to suppress gully formation. The radial basal spacing of imprinting teeth is also about 2 inches. This 2-inch gap around the base of each tooth improves penetration into the soil while providing a dam between adjacent imprints for safe storage of collected rain or irrigation water until it infiltrates. All six categories of imprinting rollers make imprints or microwatersheds about 12 inches square in size and shape. These small isolated watersheds provide excellent control of infiltration and the microclimate, thereby greatly accelerating revegetation processes. A sample imprinting roller is pictured in Figure 2.
Table 1. Imprinter Roller Dimensions In Inches
Footnotes: D = Diameter & C = Circumference, 1" = 1 inch = 2.54 cm, 1 foot @ 30cm, sketches for Table 1 follow:
Category II, 7-foot imprinting roller designed for revegetating steep slopes.
Click on the Seeder Diagram / Tow Frame pictures at right to learn more about
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