Manufacturing mechanical precision machining

Figure 16.8 Diagram of a quadrupole. Notice the pairing of oppositely charged electrodes. This mechanically simple device requires high-precision manufacture of the rods machined to the hyperbolic shape. In many models the rods have the size of a ball-point pen. Right, graph of a series of equipotential hyperbolic lines in the central part of the filter.

At the beginning of industrialization, various designs of mechanical punch-and-die presses with single or multiple cavities, including stone presses with indexed die tables, were used, particularly for the manufacture of high-quality bricks that required dimensional precision for their application (e.g., refractory bricks). Among the earliest machines of this type was the Couffmhal press (Fig. 6.10-14, Section 6.10.2). Later, hydraulic presses were also used. 

Surface finish of the test coupon Various manufacturing processes can change the physical form of the metal s initial surface or produce surface films, either of which may influence the eharacteristies of the corrosion deposit that is developed when in contact with water. These effeets may influence or change the mechanism controlling the level of eontamination. The standard sit-and-soak test defines a machined smface that will not be representative of a cast surface, for example. In the first set of eonormative tests, aetual galvanized steel pipe was used to overcome precisely this sort of problem. 

Cox D, Newby G, Park HW, Liang SW (2001) Performance evaluation of a miniaturized machining center for precision manufacturing. In ASME conference proceedings of international mechanical engineering congress and exposition (IMECE2004), 13-19 Nov, Anaheim... 

Mass accuracy is affected mainly by the precision of machining and assembly of the electrodes of mass analyzers as well as the stability of their electronic systems. Imperfections in the construction of mass analyzers originate from mechanical errors during manufacturing and assembly of components. It is difficult to ensure an overall machining and assembly error of <10 pm even for a small mass analyzer, such as IT. Assuming one dimension of a mass analyzer is roughly 6 cm, a 10 pm error corresponds to 0.017% relative error. The... 

PPS is well suited for the manufacture of mechanically and thermally highly stressed moulded parts. In machine construction and precision engineering PPS is used for various components such as pumps, valves and piping. PPS is also applied in oil field equipment such as lift and centrifugal pump components, oil patch drop balls, rod guides and scrapers. 

Instrumanta. On the basis of combinations of strength and dimensional stability, aluminum alloys are used in the manufacture of optical telescopic, space guidance, and other precision instruments and devices. To ensure dimensional accuracy and stability in numu-facturing and assembling parts for such equipment, additioml thermal stress-relief treatments are sometimes applied at sta of machining, or after welding or mechanical assembly. 

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