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Characteristics of guideways for high- and ultra-precise applications 1 and 2 order straightness 3 order straightness Position error (Step-response test) wear load capacity static stiffness dynamic behaviour price/cost
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dynamic behaviour are other negative factors Therefore, in ultra-precision machines, the hydrostatic guideway is often preferred Typical lathe machining operations shown in Figure 517 are a clear example of the application of guideways Guideways are used to guide the carriage and tailstock to the required position along the pathway of the lathe machine The type of the guideway used here is one that has a prismatic and one with a flat external shape The advantages of this guideway combination are that it is easy to manufacture and has a greater accuracy of travel There is another type of guideway in the cross slide-carriage application, which is of the dovetail type This arrangement is used in this application because the height of the guideways is comparatively small due to carriage height limitation The dovetail is preloadable resulting in a high stiffness in all directions Furthermore, wear occurs usually symmetrically and does not affect the alignment of the carriage [9]
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Fig 517: The conventional lathe with an inverted prismatic and flat external guideway [9]
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Figure 518 shows a typical open rectangular (T-shaped) configuration, which is commonly seen in machine tools It provides a very high stiffness and has symmetrical wear The open rectangular configuration is able to support machines with a 5 10 m repeatability [9] Figure 519 shows the possible combination of different types of guideways on the base of the machine tools Figure 520 shows a lathe bed section, showing inverted prismatic symmetric and flat
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Fig 518: An open rectangular or T-shaped configuration [9, 10]
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Fig 519: Possible combinations of different types of guideways
for conventional machines
Fig 520: A lathe bed section showing
inverted prismatic and flattype ways
type guideway combinations, and Figure 521 shows an example of a guideway employing rolling elements to reduce friction In addition, Figure 522 illustrates a precision lathe with a guideway containing foundry sand for enhanced stability
Fig 521: Friction reduction in a conventional bedway is
Fig 522: A precision lathe with a bedway
improved by using normal and cross roller bearings
containing foundry sand for an enhanced stability
Ultra-precision Machine Elements
In ultra-precision machines, the slideways utilize a fully constrained and preloaded hydrostatic oil bearing design to provide a high degree of stiffness, vibration, damping, smoothness of motion and geometrical accuracy For the Precitech ultra-precision machine discussed earlier, the slideways are capable of a slide position feedback resolution of 86 nm, which is provided by an ultra-fine pitch low expansion glass scale The slide has a horizontal straightness of between 02 m and 03 m This extreme accuracy is only achievable through the use of hydrostatic oil bearings The guideways employed in these machines are either box shaped or dovetail shaped as shown in Figure 523 and 524, respectively
Fig 523: A hydrostatic box type guideway for an ultraprecision machine [4]
Fig 524: An ultra-precision lathe with a
hydrostatic dovetail guideway [4]
53 DRIVE SYSTEMS
The purpose of the drive system is to provide motion at the required rate In this section, the evolution of the drive systems from the nut and screw transmission to the linear motor drives is clearly illustrated The conventional machines usually apply the nut and screw transmission system, which is sometimes known as a lead screw system with its improved form using recirculating balls In precision and ultraprecision machines, the friction drive and linear motor drive are more suitable
531 Nut and Screw Transmission
The most typical and popular drive system used in a machine tool is the nut and screw system The transmission and movement of this working table is subject to the rotational movement of the screw, which is converted to a linear movement on the working table The nut and screw mechanism is schematically shown in Figure 525 Both the nut and the screw have a trapezoidal form The nut moves along the screw axis, while the screw that is fixed axially is rotated If the rotation of the screw
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