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 . ng a pin throughit to the center of the cam, tracing upon it, from the paper below, thepressure lines and the centers of the follower. These centers beingrotated back until coincident with the corresponding points of thetravel, a second point in each pressure line is pricked through on thepaper below. Upon the removal of the tracing cloth, each pressureline can then be quickly drawn through these pricked poin
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 . ng a pin throughit to the center of the cam, tracing upon it, from the paper below, thepressure lines and the centers of the follower. These centers beingrotated back until coincident with the corresponding points of thetravel, a second point in each pressure line is pricked through on thepaper below. Upon the removal of the tracing cloth, each pressureline can then be quickly drawn through these pricked points and thecorresponding centers of the follower, thus enabling the action of thecam to be properly judged. MACHINE DRAWING 95 Example 6. Pointed Follower Mounted on Oscillating Arm. In Fig. 84 the follower roll has been abandoned, and the originalpointed follower substituted. The motion of the follower point,however, instead of being in a straight line, is in the arc of a circleprecisely as in Fig. 83, except that the follower, being a point insteadof a roll, the points Lt, L2, L3, etc., have the outline of the camdrawn directly through them. This case is introduced merely for the. Fig. 84. Diagram of Cam with Pointed Follower on Oscillating Arm purpose of making the set of cams complete, and it is so closely acounterpart of Fig. 83 that the detail study of it is considered un-necessary. Example 7. Flat Follower with Path Perpendicular to WorkingFace. 1. Follower Positions. In this example, Fig. 85, is introduceda follower with a flat surface, its path being perpendicular to itsworking face. The length of its path 06 is the same as before, andis divided into six equal divisions. 96 MACHINE DRAWING 2. Cam Radii. The point of original contact 0 being chosen,the original radius OC is drawn .perpendicular to it; the radii CXand CB, limiting the arcs of rise, rest, and fall, are then drawn intheir proper relation to CO, and the arcs of rise and fall subdividedas before. 3. Follower
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
