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surfaces of the lens These pieces are held together with a pliable gasket material For typical ophthalmic lenses, the mould surfaces are spherical or toroidal in shape and are readily made using conventional methods, which are known to be quick and inexpensive Manufacture of aspherical glass lenses The first step in the manufacture of aspherical lenses involves the fabrication of glass moulds by grinding (Aspherical generator) The manufacture of a glass mould from a ceramic mould using the sagging method is a time-consuming procedure and can sometimes take as long as an hour Also, as these ceramic moulds are fragile, they can break easily when handled Glass, silicon and germanium moulds have been manufactured by fine grinding on a CNC 4-axis machining centre and then polished [12] There is a wide variety of ophthalmic lenses that are available In humans who require spectacles, it is seen that very rarely is the power of one eye the same as the other The automation of assembly gaskets containing the inner and outer glass moulds for making lenses, which are discrepant, has been very successfully achieved Optical flat An optical flat (Figure 118) can be categorized as a precision product and is basically a highly polished piece of material such as a plate glass, optical glass, Pyrex or fused quartz Although quartz is the most expensive among the aforementioned materials, it is the best optical material known Optical flats are cylinders with a thickness varying from 3/ 8 to 3/4 inches (953 to 19 mm) and their diameter can vary from about 2 to 4 inches (508 to 1016 mm) [15] One of the circular surfaces of an optical flat is often polished so perfectly that its surface waviness or irregularity is virtually immeasurable However, optical flats can be manufactured in such a way that both their circular surfaces are flat and Fig 118: An optical flat [15] perfectly parallel to each other By using optical flats, a simple and rapid checking of the flatness of surfaces has been done very accurately.



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1. 1.2 meters (4 feet). In the equation d (a t2)/2, a is the acceleration from gravity which is 9.8 m/s2. Time t is 0.5. 9:8 0:52 2 9:8 0:25 d 2 d 1:2 d Bonus question: First, you need to turn the equation inside out, so solve for t: r 2 d t a So, solving for t with d 3 and a 9.8 gives a travel time of 0.78 seconds: r 2 3 t 9:8 p t 0:612 t 0:78 2. This is a tricky question, since the details are spread around. The force is the mass times the acceleration, sure. But what is the acceleration of a ball being stopped in a tenth of a second Acceleration is the change in velocity over time. We know the ball was moving at 10 meters in 1 second, and once it hits the wall it is





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Figure 622 illustrates the general form of the pressure distribution within a full-film hydrodynamic sliding journal bearing In Figure 622 (a), the pressure rises as the rotating shaft draws oil into the converging wedge approaching the point of minimum film thickness where the maximum pressure occurs After this point, the pressure decreases as the space between the bearing and the journal diverges Figure 622 (b) shows the pressure distribution axially along the shaft through the line of minimum film thickness or maximum pressure The pressure is maximum at the centre of the length of the bearing and decreases as one moves towards the end of the bearing where the pressure is equal to the ambient pressure This is because the lubricant film is exposed to the environment and leakage occurs A continuous supply of the lubricant is important to ensure an adequate supply to create the pressurized film for supporting the applied load

Fig 622: Pressure distribution in the oil film for hydrodynamic lubrication [14]

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