Mountings, table

As with the preparation of unoriented mounts, there have been many methods proposed to induce orientation in the mount (Table n). The relative merits of these techniques will not be discussed here, but the reader is referred to Moore Reynolds (1997), Hughes Warren (1989), and Hardy Tucker (1988) for up-to-date summaries of the most commonly used methods. 

Figure 1.22 shows the workpiece-mounting table B and the feed unit for y-axis. These two units can be incorporated together or used separately. The built-in friction free air balance in the Y-axis guarantees the level of B table to be 0.04 pm/ 200 mm, as the Y-axis moves up and down. The accuracy has currently been improved upto nanometers. 

A mold-mounting table with a clamping frame above it to hold the sheet. Both the moldmounting table and the clamping frame should move in both up and down directions. 

These basic units—i.e., heater, mold-mounting table, sheet-clamping frame, and vacuum or pressure sources—are contained in every piece of thermoforming equipment however, for highspeed continuous production, many improvements have been made. 

Sprockets should have at least 21 teeth for long drive life and smooth operation. Drives using sprockets with fewer teeth are likely to have increased vibration and noise because of chordal action (see Figure 5-2 and Figure 5-3, and the explanation used for roller chain). Each sprocket must be large enough to accommodate the bore and keyway specified for the shaft on which it will be mounted. Table 7-2 fists the maximum recommended bore and minimum hub diameter for standard silent chain sprockets with up to 33 teeth. 

The containers were subjected to the loosely stored cargo test in accordance with MIL-STD-1904. All containers were tested at hot and cold temperature. The containers were conditioned at -65TF (cold) and 165TF (hot) for a minimum of 24 hrs prior to the loose cargo test. The loaded PA154s were placed on a steel-mounting table of the loose cargo machine and subjected to a frequency of 300 Hz. The containers were vibrated unconstrained for 15 min on both of their horizontal and vertical axis (fig. 3). 

X-ray spectrometer An apparatus used in the X-ray study of crystals in which a fine beam of monochromatic X-rays impinges at a measured angle on the face of a crystal mounted in its path, and in which the intensity of the X-rays diffracted in various directions by the crystal is measured with an ionization chamber mounted on an arm of the spectrometer table, or is recorded photographically. 

The apparatus consists of a tip-position controller, an electrochemical cell with tip, substrate, counter and reference electrodes, a bipotentiostat and a data-acquisition system. The microelectrode tip is held on a piezoelectric pusher, which is mounted on an inchwomi-translator-driven x-y-z tliree-axis stage. This assembly enables the positioning of the tip electrode above the substrate by movement of the inchwomi translator or by application of a high voltage to the pusher via an amplifier. The substrate is attached to the bottom of the electrochemical cell, which is mounted on a vibration-free table [, and ]. A number... 

Portable scales generally have a platform near the floor with the indicator mounted on a column for ease of operation. These scales may be on wheels, and many are battery-powered. Capacities are generally less than 600 kg. Bench scales can be placed on a wheeled table for similar use. 

Water-cooled mold mounted on oscillating table... 

HANDLING OF BULK SOLIDS AND PACKAGING OF SOLIDS AND LIQUIDS TABLE 21-6 Screw-Conveyor Data for 50-lb/fH Material and Pipe-Mounted Sectional Spiral Flights ... 

The enclosure under test is mounted in its normal position on a turntable, the axis of which will be vertical and height variable, located near the centre of the semi-circle formed by the oscillating tube. The table is rotated to spray all parts of the enclosure equally. The enclosure should be kept under a spray of water for 10 minutes. The lesl results should be the same as for degree of protection 1. 

Only high tensile (HT) fasteners must be used for busbar Jointing and their interconnections or links not only to take care of the fault level but to also maintain the recommended contact pressure over a long period of operation as noted in Table 29.1. An ordinary fastener may not be able to withstand or sustain this torque for long. Similarly, the busbar supports, which are mounted on only two or three fasteners, should also be fitted with these fasteners. 

This is a response spectrum obtained during a test in a laboratory while exciting the shake table with ground movements as in the RRS. The test object is mounted on the shake table. The test object should respond normally during such movements. The test conditions (i.e. TRS) should closely overlap the required seismic conditions (i.e. RRS) of Figure 14.25. 

Now that it is possible to establish test facilities in a laboratory to simulate the time history of an earthquake seismic tests are conducted by creating the ground movements in the test object. Other methods, such as by analysis or by combined analysis and testing, are also available. Refer to IEEE 344 and lEC 60980 for more details. For this purpose a shake table, able to simulate the required seismic conditions (RRS) is developed on which the test object is mounted and its performance observed under the required shock conditions. Since it is not easy to create such conditions in a laboratory, there are only a few of these facilities available. The better equipped laboratories are in Japan, the USA, the UK, Greece, Germany, India and China. In India the Earthquake Engineering Department (EQD) of the University of Roorkee (UoR) is equipped with these facilities. 

The test object is mounted on the shake table and subjected to movements at the desired level and frequency in the horizontal and vertical directions simultaneously and its performance is critically observed, recorded and... 

Figure 14.24(a) Panels mounted on a shake table during seismic tests at UoR... 

Passive test The test object is mounted on the shake table and subjected to both horizontal (X and Pj movements or one cumulative orthogonal horizontal and one vertical ground movement simultaneously. Accelerometers are mounted on the shake table to measure its movements and also on the test object at its most vulnerable points. These points may be identified by the manufacturer or the user to monitor the behaviour of the object in such locations. 

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