. Farm machinery and farm motors. THRESHING MACHINERY 207 tions. These operations and the parts that are called uponto perform them in most machines may be enumerated asfollows: First, shelling the grain from the heatl. The partswhich do the shelling or the threshing are the cylinder andthe conca\es with their teeth. lig. 157 shows these ])arts. Second, separating the straw from the grain and i)arts which perform this operation are the grate, thebeater, the checkboard, and the straw rack, or FIG. 157—THE CYLINDER AND CONCAVE Third, separating the grain from the chafT and dir
. Farm machinery and farm motors. THRESHING MACHINERY 207 tions. These operations and the parts that are called uponto perform them in most machines may be enumerated asfollows: First, shelling the grain from the heatl. The partswhich do the shelling or the threshing are the cylinder andthe conca\es with their teeth. lig. 157 shows these ])arts. Second, separating the straw from the grain and i)arts which perform this operation are the grate, thebeater, the checkboard, and the straw rack, or FIG. 157—THE CYLINDER AND CONCAVE Third, separating the grain from the chafT and dirt, per-formed by the shoe, fan, windboard, screens, and taijingselevator. Fourth, delivering the grain to one place and the strawto another, which is accomplished by the grain elevatorand the stacker or straw carrier. Other attachments, as the self-feeder and weigher, areoften provided. These parts vvill now be discussed somewhat in detail. 284. Cylinder.—The cylinder is usually made by at-taching parallel bars to the outer edge of spiders mountedon the cylinder shaft. The whole is made very rigid by 208 FARM MACHINERY shrinking wrought-iron bands over the bars. A solidcylinder may be used instead of the bars. The bars in somemakes are made of two pieces, and hence are calleddouble-barred cylinders. The teeth are held in place bynuts or wedges, and are often provided with lock bars may be placed under the nuts and act as acushion, preventing the teeth from loosening as readilyas othe
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