Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . e third from B, Dthe fifth from C, E the seventh from D, F theseventh from E, G the fifth from F, H thethird from G; and through the points H, G, F, E,etc., draw lines parallel to Ie, cutting the line Ae at7, 6, 5, 4, etc. It is obvious that Ae is then dividedin the same proportion as AI, and if the follower wereof Dividing Line made to travel along the line Ae according to these of Travel & ? divisions, it w
Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . e third from B, Dthe fifth from C, E the seventh from D, F theseventh from E, G the fifth from F, H thethird from G; and through the points H, G, F, E,etc., draw lines parallel to Ie, cutting the line Ae at7, 6, 5, 4, etc. It is obvious that Ae is then dividedin the same proportion as AI, and if the follower wereof Dividing Line made to travel along the line Ae according to these of Travel & ? divisions, it would have uniformly accelerated andretarded motion. Practical Example of Complex Motion Cam. For the purposeof illustrating these principles, suppose it is required to design aplate cam, Fig. 90, such that the follower rises from point A to e,with harmonic motion, while the cam rotates through 120°; it is thento remain at rest during the cam movement of 60°; it is then to fallto its original position with a uniformly accelerated and retardedmotion, while the cam turns through 150°; it is then to remain atrest while the cam rotates through the remaining 30°, when the same. MACHINE DRAWING 103 cycle of movement is to be repeated as long as desired. This is briefly expressed as follows: Harmonic rise 120° Rest 60° Uniformly accelerated and retarded fall 150° 30° 1. Follower Positions. The length of travel Ae being known, it is divided for purposes of the rise, by the principles of Fig. 88, into
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
