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This free online PDF editor allows you to add and edit texts, images and shapes in your PDF file. Annotate PDF online for free. No registration or installation ... Of the more important advantages offered by gas lubricants, the low viscosity of gases as compared with liquids can be exploited to obtain a special benefit The extremely low static friction, which externally pressurized bearings can offer, finds applications in torque measuring equipments, dynamic balancing machinery, semiconductor positioning systems, micro or zero gravity trajectory simulators and other instruments requiring near-static conditions [13] The high averaging accuracy of gas bearings is discussed in detail by Speciality Components, one of the manufacturers of air bearings in the United States [13] The high accuracy of motion that can be obtained on using air bearings is equally important in some applications Considerable differences in motion accuracy exist between rolling element bearing supports and air bearing supports In linear slides, for example, rolling element bearings witness a noise error (or rumbling) due to the surface roughness of the ways and eccentric rotation of the rollers or balls On the contrary, air bearings do not suffer from this difficulty The reason for this lies in the absence of surface contact between the bearing parts and the averaging action of the air film over the various local surface irregularities present in the machined surfaces Even the finest of rolling element bearings are orders of magnitude less accurate than air bearings In rotating air bearings, this effect produces high orders of rotational accuracy and smoothness of travel For linear slides, pitch, roll and yaw, errors of much less than a fraction of an arc second are attainable and straightness of travel errors of the order of tenths of nanometers have been achieved The stiffness of a bearing is crucial for application in ultra-precision machines At a zero speed, air bearings provide considerably high stiffness characteristics This same effect is seen at zero or low loads For properly designed and manufactured aerostatic bearings, it is not uncommon to measure a stiffness of the order of several hundred N/ ms (several million pounds per inch) [13] The non-contact nature of hydrostatic and aerostatic bearings allows the bearings to operate at minimal wear The advantage of zero wear can be seen largely in externally pressurized or aerostatic bearings and to some large degree in self-acting or aerodynamic bearings Although some properly designed rolling element bearings can achieve practical wear rates, none can match the zero wear characteristic of aerostatic bearings In the case of aerodynamic bearings, starting and stopping cause some rubbing within the bearing clearance, but this can be alleviated by introducing a pulse of air just as the bearing begins translation [13] Furthermore, as compared with rolling element bearings, air bearings do not suffer from increased wear rates as the speed or load is increased With proper care and maintenance, air bearings can be expected to have an infinite life The use of air as a lubricant also offers certain advantages over other types of lubricants Gas lubrication has found a place of particular importance in circumstances where it is necessary to keep the environment free from contamination caused by conventional lubricants Such situations arise in semiconductor wafer handling systems In these situations, it may be costly or impractical to manufacture a system that can effectively seal off contaminants from oil lubricants used in roller slides The externally pressurized air bearing lends itself well to harsh environments where liquids, dust and contaminants are present The air bearing s great resilience stems from the fact that with a positive pressure existing inside the bearing, all foreign matter is repelled from the critical bearing surfaces [13] Externally pressurized bearings can operate even when they are completely submerged. pdf editor software online purchase: Easily Edit Metadata or Properties in PDF | Wondershare PDFelement edit pdf text online Online editor and converter - edit any document quick and easy
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Use Soda PDF Editor to easily customize your PDFs with our wide array of editing tools. Edit pages, edit content, or manipulate the size and layout of your entire ... For achieving a higher precision in the manufacture of a part using precision engineering, Nakazawa [1] and McKeown [3] have summarized some objectives and these are to: 1 Create a highly precise movement 2 Reduce the dispersion of the product s or part s function 3 Eliminate fitting and promote assembly especially automatic assembly 4 Reduce the initial cost 5 Reduce the running cost 6 Extend the life span 7 Enable the design safety factor to be lowered 8 Improve interchangeability of components so that corresponding parts made by other factories or firms can be used in their place 9 Improve quality control through higher machine accuracy capabilities and hence reduce scrap, rework, and conventional inspection 10 Achieve a greater wear/fatigue life of components 11 Make functions independent of one another 12 Achieve greater miniaturization and packing densities 13 Achieve further advances in technology and the underlying sciences scanned pdf text editor online free PDFescape - Free PDF Editor & Free PDF Form Filler
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Select a PDF file to edit by uploading it from your computer, or through a cloud storage service such as Google Drive or Dropbox. ... Split pages from your PDF into separate files, or Merge to combine different documents into one! In addition, you can also edit the content of the pages ... The increasing demand for precision manufacturing of components for computers, electronics, and nuclear energy and defence applications dates back to the early 1960s Examples of these components are optical mirrors, computer memory discs, and drums for photocopying machines, with a surface finish in the nanometre range and a form accuracy in the micron or the sub-micron range According to McKeown [3], precision engineering can be classified into two important subsets, microtechnology, in which the physical scale of the products is small (in manufacturing terms being made to dimensions and tolerances of the order of micrometers mm) and nanotechnology, in which dimensions and tolerances are of the order of nanometers (nm) (Figure 11) The historical progress of the achievable machining accuracy over the last ninety years is plotted in Figure 15 [2] It is probable that a further development of the machining processes can be achieved by extrapolation, in both the microtechnology and nanotechnology regions It is seen from the vertical axis in Figure 15 that what was considered as ultra-high-precision machining, for example, in 1928 in the developed countries is considered as normal machining in the same countries in 2000 It is certain that the need for all four classes will continue The limit for nanoprocessing will be set by the laws of science and, it is probable that this curve will get saturated in the next decade, and the other classes of machining will move parallel to this saturation curve By extrapolating the curve of ultra-high-precision machining shown in Figure 15, it can be estimated SU(2) x U(l). Summary Fig 15: Taniguchi s chart (1994) modified by the authors to show the achieved machining accuracy for decade intervals beginning 1900, FWTaylor (1907) High Speed Steel (HSS), Merchant s mechanics of machining (1944), Gilbert s economics of machining (1945) and Scattergood s theory of ultra-precision turning (1988) easy pdf text editor online free Top 5 Free PDF Editor on Windows 10 - iSkysoft
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