The essentials of gearing; a text book for students and for self-instruction, containing numerous problems and practical formulas . NCIPLES. 1. Constant Velocity Ratio. Motion may be transmitted between lines of shafting bymeans of friction surfaces ; and if there be no slipping of the contact surfaces, the circumferenceof the one will have the same velocity as the circumference of the other. The number of revo-lutions of the shafts will be invei-sely proportional to the diameter of the friction surfaces, andthis ratio will l)e maintained constant under the condition of no slip. Such friction
The essentials of gearing; a text book for students and for self-instruction, containing numerous problems and practical formulas . NCIPLES. 1. Constant Velocity Ratio. Motion may be transmitted between lines of shafting bymeans of friction surfaces ; and if there be no slipping of the contact surfaces, the circumferenceof the one will have the same velocity as the circumference of the other. The number of revo-lutions of the shafts will be invei-sely proportional to the diameter of the friction surfaces, andthis ratio will l)e maintained constant under the condition of no slip. Such friction surfacesand shafts are said to have a constant velocity ratio. 2. Positive Rotation. In order to transmit force, as well as motion, and to insure itsbeing positive, it will be necessary to place cogs, or elevations, on one of the friction sur-faces, and make suital»le depressions in the other surface. 3. Gearing. The study of toothed gearing is a study of the shape of these cogs, teeth, orodontoids, which are designed to produce a positive rotation while preserving the condition ofconstant velocity ratio. 1 GEARS Fig. 1. Fig. 2.
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