81. In Figure P8-81, the rack is driven by the pinion that has a rotational speed of 50 rpm. The diametral pitch is 12, Np 30, and the length of the rack is 7.00 ft. Find the following: (a) The pitch diameter of the pinion (b) The distance from the pitch line to the back of the rack (c) The center distance. (d) The linear velocity of the rack (e) The time required to move the rack 7.00 ft. (f) The number of revolutions of the pinion as the rack moves 7.00 ft. Pinion, Np = 30, np = 50 rpm CW Diametral Pitch = 12 Min FIGURE P8-81 Rack and pinion for Problem 8-81

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Engineering Drawing

Technical drawing has been around since ancient times. As in the ancient Renaissance, complicated drawings were created, including Leonardo da Vinci's drawing. Modern engineering drawing, including its specific orthographic projection with scale conventions, began in Europe (France) during the early stages of Industrialization. L.T. C. Rolt also made some of Marc's drawings for its block-making machinery (in 1799) that also may have contributed significantly to British engineering technology. Since he learned the art of presenting three-dimensional(3D) items in a two-dimensional(2D) plane, as we now term mechanical drawing.