Identifier: scienceofsuccess01macg (find matches)
Title: Science of successful threshing
Year: 1911 (1910s)
Authors: MacGregor, Wallace F., 1874- Dingee, W. W., joint author
Subjects: Threshing
Publisher: Racine, Wis., J.I. Case threshing machine co., incorporated
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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ass in the same space between theconcave teeth, during one revolution, *five teeth trackingas it is called. The 12-bar cylinders have three teethtracking. Cracking Grain. The cut on the following page is fullsize and shows the actual distance between the concave andcylinder teeth of the Case regular cylinder. It is shown toemphasize the importance of having the cylinder properlyadjusted endwise and of keeping the teeth straight. Sup-posing all the teeth to be straight and that the cylinder bemoved 1-16 of an inch to one end. Then instead of therebeing 1-8 of an inch space between the cylinder and con-cave teeth on both sides, the cylinder teeth would be 3-16of an inch from the concave teeth on one side and only1-16 of an inch from them on the other. This conditionof affairs would allow the heads to slip through withoutbeing threshed on one side of the teeth and on the otherwould crack the grain and cut up the straw, thereby con-suming much power, increasing the difficulties of separa-
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FIG. 44. CUT SHOWING SPACE EETV/EEN TEETH—FULL SIZE. THE CYUNDER:, CONCAVES AND BEATER 159 tion and making the sieves handle a large amount of chaff.This same condition exists when all of the teeth are moreor less bent. The cylinder may be moved endwise, as al-ready explained, to give the proper spaces between theteeth, but the teeth must be kept straight. Too high speedor too many concave teeth m.ay cause cracking. Special Cylinders. To do good work in rice a specialcylinder and concave are required with a wider spacing ofthe teeth than the regular ones. This gives more clear-ance between the cylinder and concave teeth and, togetherwith a reduced speed, prevents the cylinder from crackingthe rice. A special cylinder and concaves are also madefor threshing peas, beans and peanuts. Either of thesespecial cylinders may be put in any Case separator if theconcaves and concave circles be changed also. Furtherinformation regarding threshing rice, peas, beans, peanuts,etc., is given elsewh

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