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is reversed, the direction of movement will also be reversed This gives a linear movement to the carriage, which is attached to the screw These drives have a high load-carrying capacity even though the nut and screw transmission is compact The other advantages of this drive are simplicity, ease of manufacture and possibility of attaining a slow and uniform movement on the operative member
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Fig 525: A schematic diagram of a nut and screw transmission [19]
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The speed of the operative member can be calculated as follows: sm = t K n [mm/min] where sm the feed per minute of the operative member t the pitch of the thread, mm K the number of starts of the thread n rpm of the screw Rapid transmission is achieved by having multi-start threads Thus, if K = 4, the feed increases four times Lead screws, which convert linear motion into rotary motion, are not only available at a low cost, but they are also available in a large variety of sizes ranging from 3/16 inches to 4 inches (Figure 526) The absence of a ball recirculating vibration often implies a less audible noise compared to when ball screws are used Non-corrosive materials, such as stainless steel and internally lubricated oils, make it less susceptible to particulate contamination compared to ball screws Lead screws
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provide a cost-effective solution for moderate to light loads However, for vertical applications, anti-backlash nuts should be mounted with thread or flange on the bottom However, lead screws are not suitable for a cantilevered load arrangement, which might cause a moment on the nut, which in turn can lead to premature failure Having a low coefficient of efficiency in the nut and screw transmission is a major drawback This is because this drive application has large frictional losses Because of this, the drive has a restricted feed and auxiliary motion in machine tool applications The sliding friction between the screw and the nut Fig 526: A lead screw [11] is now replaced by rolling friction Introducing an intermediate member on the screw and nut contact area, such as balls or rollers, does this An anti-friction screw and nut transmission with balls as rolling members is shown in Figure 527 (a) Various sizes are available commercially for different applications (Figure 528)
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Fig 527: A schematic diagram of a recirculation bearing nut and screw transmission [11]
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Fig 528: Various recirculating ball screw systems [11, 12]
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The ball runs along the screw and the nut threaded area and recirculates again through an external return chute as shown in Figure 527 (a) and through an axial channel drilled in the nut [Figure 527 (b)] Usually, the thread of the nut and the screw is half-round and acts as a ball race Backlash elimination on this transmission can be overcome by preloading using springs In ball screw transmissions, the screw is rotated by the motor, and the shaft is connected to the nut, or sleeve, as illustrated in Figure 529 Lubrication is done using low vapour pressure greases for clean-room and vacuum application The sliding friction transmission efficiency is as low as 02 04 compared to anti-friction nut and screws in which the transmission efficiency is as high as 09 095 The screw and nut systems are generally used in conventional and precision machines When the screw is rotated, the nut with its ball bearings moves along the screw axis to create a linear movement on the carriage table along the bedway of the machine Other applications of the screw drives can be observed in grinding and jig boring machines where the drives are largely used for feed motion of precision machine tools In cases where the backlash is extremely undesirable, especially in numerical control machines, the anti-friction nut and screw drives become a popular transmission choice
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Fig 529: Ball screw transmission [11]
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