Base plate

Fig. 5. (a) Temperature isotherms in the region of a moving welding arc. (b) Heat-affected-zone thermal cycles at various locations in the base plate (see... 

Fig. 8. Vibration isolators (a) single-spring mount with base plate (b) neoprene mount (c) spring and neoprene hanger and (d) neoprene waffle pad.

The use of high purity selenium in digital imaging is considered a potential market. Selenium-based plates can be used to replace conventional silver-based x-ray film, and in 1994 the Xerox Corporation introduced a selenium-based product, Verdefilm, for use in graphic arts appHcations. 

Zinc oxide—eugenol impression pastes are used primarily as corrective washes over compound impressions, as veneer impressions, as temporary liners or stabilizers in base-plates and dentures, and as bite-registration pastes for recording occlusal relationships in inlay, crown, and bridge techniques. 

Fig. 1. ADA flow curves of dental waxes. A, impression waxes B, sheet wax C, indirect-inlay wax D, direct-inlay wax E, base-plate wax. The dashed...

Pattern Waxes. The pattern waxes, ie, inlay casting, base-plate, and sheet and shape waxes, are used to constmct the prototype or pattern from which a finished dental restoration is produced. 

Base-Plate Waxes. Base-plate waxes are used to substitute for, or be used in conjunction with, a base plate to form a pattern for the... 

Base-plate waxes are formulated for specific uses or working conditions into types 1,11, and 111. Consequentiy, the flow requirements differ. Type 1 waxes are soft waxes for building contours and veneers, type 11 waxes are medium waxes used for pattern production in the mouth in temperate weather, and type 111 waxes are hard waxes used for production in the mouth in hot weather. At 37°C, type 1 waxes have a 45—85% flow at 45°C, type 11 waxes have a 50—90% flow and type 111 waxes have a 5—50% flow. 

The linear thermal expansion of base-plate waxes should not exceed 0.8% at 25—40°C. It is desirable to invest any waxed-up case as soon after waxing is completed as possible. This minimises changes in articulation owing to tooth shift, and changes in palatal thickness owing to lifting of the palatal section by wax shrinkage caused by variations in room temperature or by the release of stress. 

Base-plate wax compositions are generally regarded as trade secrets. A substantial percentage of paraffin is usually present, probably 50—80 wt %. Beeswax [8012-89-3] camauba wax [8015-86-9] ceresin, microcrystalline waxes, Acrawax C (Glyco Products Co. Inc.), mastic gum, rosin [8050-09-7] and synthetic resins may make up the balance of the formulation. Base-plate waxes are generally sold in sheet form about 1.3 mm thick, 75 mm wide, and 140 mm long. 

The flow of sheet and shape wax is much higher than that of inlay wax and base-plate wax, reflecting increased pHabiUty, ductihty, and plasticity. At 35°C these waxes should have a flow of 10% max, and at 38°C a flow of 60% min. At 23 1° C they should not fracture when bent double. 

The suction gas which enters from the periphery is trapped by the scrolls. The closed volumes move radially inward until the discharge port is reached, when vapor is pressed out. The orbiting scroll is driven by a short-throw crank mechanism. Similar to screw compressors, internal leakage should be kept low, and is occurring in gaps between cylindrical surfaces and between the tips of the involute and the opposing scroll base plate. 

At Pump Installation Be sure the motor shaft centerline is below the pump shaft centerline so that it can be shimmed upward. Make sure the motor mount boltholes have sufficient play to allow for some lateral adjustment. Many pumps and motor assemblies are shipped from the factory on a common channel iron base plate. The manufacturer alleges that they arc already aligned at the factory. You need to verify and correct this alignment in all cases. 

The base should be sufficiently strong to withstand the machinery weight and minimize vibrations. Five times the mass is the rule. If the pump, motor, and base plate weighs 1,000 lbs, the foundation should weigh at least 5,000 lbs. 

Recommended materials are outlined in the standards. Some of the recommendations in the standard are carbon steel for base plates, heat-treated forged steel for compressor wheels, heat-treated forged alloy steel for turbine wheels, and forged steel for couplings. The growth of materials technology has been so rapid especially in the area of high temperature materials the standard does not deal with it. Details of some of the materials... 

Most turbomachinery is mounted on structural steel platforms sometimes referred to as base plates or skids. These platforms are then installed on a mass of concrete at the jobsite (either by direct grouting or mounting on sole plates) to become the machinery foundation. Platforms should always be considered as part of the foundation rather than as part of the machinery. 

Many data cells in the CCPS Taxonomy use equipment boundaries found in available generic data sets in which equipment and service is similar to that in the CPI. The boundaries established for other data cells were generally combinations of normal equipment modules—such as pump, seals, coupling, motor and base plate, or refrigeration units—and functionally interdependent basic and auxiliary components, such as motor controllers. Boundaries may change as greater amounts of equipment reliability data become available. 

Sohl-leder, n. sole leather, -platte, /. base plate, bottom plate. 

Tower Bose out of Level 1/4" Max. Measured of Extreme Outer Edge of Base Plate... 

Oil coolers for bearing oil (and often sized for turbine oil requirements when turbine is used) must be a part of the system and are usually mounted on or in the compressor-driver base plate (s). This makes a compact arrangement but is sometimes so congested as to give poor maintenance conditions. The cooler, oil filter, and regulator can also be mounted adjacent to the unit. For some sizes, the compres-... 

Maraging steel welds are somewhat less resistant than base plate. U -bend exposure of 1 240 MNm strength welds survived for up to 2 years in seawater while at 1 380 MNm failures occurred in 2-18 months. ... 

It is possible to provide cathodic protection to base plate up to 1 720 MNm yield strength, by coupling to mild steel or possibly to zinc , but zinc and metals more active than zinc tend to induce hydrogen embrittlement. Welds up to 1 380 MNm may be cathodically protected by zinc, but at impressed potentials of — 1-25V (S.C.E.) both 1240 and 1380 MNm welds fail rapidly due to hydrogen embrittlement. Neither mild steel nor zinc couples protect AISI 4340 steel . 

Bimetallic corrosion of nickel-iron alloys may be of significance in welding operations. Ni-45 Fe alloys are used as filler materials in the welding of cast irons but the favourable area relationship of weld metal to base plate... 

In another laboratory, a vacuum pump was installed on a shelf buUt into a two-foot knee-hole well above the floor level. It was out of the way, off the floor, and easy to service. Noise was substantially reduced by attaching rubber stoppers to the pump s base plate as vibration absorbers. Connection to equipment was through a hole in the work top. 

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