barcode reader library vb.net Precision Engineering in Software

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Precision Engineering
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Fig 510: Precitech 4 inch vacuum chuck [4]
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Fig 511:
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Moore vacuum chuck [5]
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52 GUIDEWAYS
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In machines, guideways help to guide the tool or workpiece along a predetermined path, usually either a straight line or a circle [6] Guideways, lubrication and drive systems are discussed in the next section and form an important part of ultra-precision machines There are basically two types of guideways friction guideways and anti-friction or hydrostatic guideways Friction guideways were initially used but are now replaced by hydrostatic guideways in precision and ultra-precision machine tools A guideway should be highly accurate, durable and rigid Machine tools require guideways for guiding the movement of the workpiece and for positional adjustment The designing of guideways for tables, saddles and cross-slides involves the following aspects [7]: Shapes of the guiding elements and arrangements of their combinations Effect of material and working conditions upon the guiding accuracy (wear) Friction conditions and load carrying capacity (roller bearings and lubrication) According to Koenigsberger [7], a good guideway design is needed to satisfy the following requirements: Provision of an exact alignment of the guided parts in all positions and under the effect of the operational forces Provision of a means for compensating possible wear Ease of assembly and economy in manufacture (possibility of adjusting the alignment in order to allow for manufacturing tolerances) Freedom from restraint Necessary prevention of chip accumulation and ease of removal of any chips Effective lubrication must be possible In order to achieve a good wear resistance, the pressure distribution must be uniform The most commonly used guideway materials are cast iron and durobar steels Different types of profiles may be employed for different applications Guideways are also classified into two groups, one with external and the other with internal features The most common is the prismatic symmetric guideway, which
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Ultra-precision Machine Elements
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is well suited for obtaining a very accurate movement of parts (Figure 512) It has the characteristic of self-aligning during wear The external prismatic guideway enables easy removal of chips, while the internal type offers a good lubricant retention For uneven pressure distribution, the prismatic symmetric type can be modified into the prismatic unsymmetric (asymmetric) type for the same operating characteristics (Figure 513) The internal prismatic unsymmetric type is normally used for rotary applications These guideways are capable of automatic adjustment because of the action of gravity, which keeps the surfaces in contact [8]
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Fig 512: External and internal prismatic
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symmetric guideways [6]
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Fig 513: External and internal prismatic
unsymmetric guideways [6]
In conventional machines, internal and external flat guideways are suitable for normal accuracy requirements (Figure 514) The setting involves straight or tapered gibs Generally, it requires good workmanship and proper protection from chips On the other hand, the dovetail is used when there is a limitation on the height of the guideways (Figure 515) It is not suitable where forces tend to pull out the guides Finally, the circular guideway is well suited for axial loading and is relatively easy to manufacture (Figure 516)
Fig 514: External and internal flat guideways [6]
Fig 515: External and internal dovetail guideways [6]
In general, internal guideways are chosen when the sliding velocity is high, and it is essential to provide a good retention of the lubricant at the interface On the other hand, when the sliding velocity is not that high and it is necessary to prevent chip accumulation and to ensure its easy removal, the external guideway is preferred In ultra-precision machines, it is common to use bellows for protection against chips and dirt
Precision Engineering
These guideways require proper lubrication to avoid a high coefficient of friction between the sliding surfaces This can result in significant wear, reducing the life as well as badly affecting the machining accuracy Proper lubrication can be provided either manually or by creating a groove along the longitude and the latitude of the guideway path for auto Fig 516: External and internal circular lubrication purposes While grease and oil are guideways [6] employed in conventional machines, guideways with aerostatic, hydrostatic and even rolling elements are essential for precision applications Guideways using rolling elements are not common in ultra-precision machines but are used very effectively in the Toshiba ultra-precision machine as shown in Figure 54 (b), particularly for grinding applications Table 51 discusses the suitability of different guideway systems for various guiding element properties It has been observed that the hydrostatic system is the most suitable system for guiding elements as it has exceptional properties such as straightness, positional error, wear, load carrying capacity, static stiffness and dynamic behavior, whereas rolling elements are much more economical [3] The straightness characteristic is defined by the use of differential equations of the first, second and third orders The weakness of the rolling element guideway is thus demonstrated Wear and
Table 51 Properties of different guideways for precision application [3]
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