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FIGURE 1434 Cylindrical cam for intermittent motion (eight-station indexing)
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Returning to the cam-follower action, experience has shown that rapid wear due to a large amount of sliding (spalling) is evident as the rollers withdraw from large cams Furthermore, the rollers tend to skew, owing to the end thrust Short rollers are suggested to minimize this detrimental action Some improvement may be made by employing conical rollers with the apex at the axis of the drum, but they are often troublesome to install Another hindrance of this cam mechanism is that it is often dif cult to maintain locking under dwell conditions A positive lock such as a wedge-shaped block that engages a pair of rollers during the idle period, relieving the shock load from the cam, is sometimes employed Shock and vibration may be caused by the backlash or clearance between the rollers and their groove
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14263 Grooved Concave Globoidal Cam for Intermittent Motion The concave globoidal cam is often referred to as the concave barrel cam When used for indexing, it is an improvement over the barrel cam or the cylindrical cam, Fig 1435a The concave globoidal cam has been successfully used in the paper industry where a 1000lb wheel, 50 inches in diameter, operates 16 hours per day, 100 indexes per minute, for two years without noticeable wear The follower has rollers that ride in grooves of the cam, giving positive-drive action during both indexing and dwell periods There rollers remain at a constant depth as com-
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FIGURE 1435 Grooved concave globoidal cam for intermittent motion (8-station)
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pared to the previous cylindrical cam, allowing a smaller follower wheel and thus reduced inertia The only shortcoming of this type of groove cam follower is that the backlash between the roller and groove sides may produce noise, wear, and vibration Generally, no auxiliary members, such as locating pins or wedge locks, are necessary during the dwell periods The number of index stations on the cam-follower turret should be eight or more, to give reasonable cam and follower wheel proportions Experience has shown that a dwell into the index period is desirable, the chordal distance being about 08 of the cam diameter and the follower diameter about twice the cam diameter An average pressure angle of about 30 and a maximum pressure angle as high as 50 have been successful In Fig 1435b we see a development of this cam track For more information refer to Jacobs (1953), who utilized turrets from 24 to 60 inches in diameter weighing 200 to 2000 pounds For small quantities, SAE 4140 forged steel billets with a cam track ame-hardened to Rock C50-60 were chosen
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14264 Spider Cam for Intermittent Motion The spider cam (Richards, 1940, 1941) derives its name from the appearance of the follower This mechanism requires a follower having four or more indexing rollers One of its former applications was the feeding of the lm in motion-picture projectors In Fig 1436 we see the drive cam rotating clockwise at a constant speed driving a four-roller follower also clockwise In Fig 1436a the roller a is being moved in its slot, indexing the follower a quarter revolution with positive-drive action In Fig 1436b, we see the dwell cycle in which the rollers are positively xed between two contours The spider cam mechanism offers more accurate control of the dwell action than do the other indexing mechanisms shown However, the limitations of backlash in the roller groove described may offer dif culty at high speeds, giving wear, noise, and vibration in the same manner as intermittent-motion cams The design of this mechanism may vary somewhat in that the follower pivot B may be located outside the cam ring farther from the cam center A With this construction, the follower will rotate in a direction opposite that of the cam
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