4Top BMP

4Top BMP



expensive to manufacture than corwentional bali screw assemblies. The nut in the new design can be machined in a single setup on an internal grinder.

Drakę Manufacturing's engineers defined the simple geometry of the internal threads v * v on the bali screw nut on a solid modeling system. The thread form is executed by a \ 'v' milling cutter or grinding wheel that has a special form designed to produce the nut thread.

According to Vosmik, Drakę Manufacturing is refining the manufacture of the bali nut.

The machinery is in limited use and the company is "still trying to defme manufacturing tolerances," he said. Ouestions remain over how close tolerances need to be, and how much quieter the bali nut should be when it is used in a vehicle.

KEYWORDS:

assemble, automobile, bali bearing, bearing, bali nut, compact, design, dimensional, external, friction, geometry, grinder, groove, helical, interference, internal, milling cutter, nut, prototype, reverse, revolution, screw, steering wheel, thread, vehicle


Ochrona Środowiska


GLOBAL WARMING


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Global warming, the gradual increase of the temperaturę of the earth's lower atmosphere as a result of the increase in greenhouse gases sińce the Industrial Revolution.

The temperaturę of the atmosphere near the earth's surface is warmed through a natural process called the greenhouse effect. Visible, shortwave light comes from the sun to the earth, passing unimpeded through a blanket of thermal, or greenhouse,

3    gases composed largely of water^/apor, carbon dioxide. methane,^nitrous oxide, and ^.podik^k

Cpro^trictytr-ozone: Infrared radiation reflects off the pianefs surface towar^d space but does not **z*-łu 'L rJc?^weasily pass through the thermal blanket. Some of it isftrapped and reflected    s

*J*‘i*£ >7 downward, keeping the planet at an average temperaturę śuitable to life, about 60°F    /

(16°C).

9 ^/oi^k^Growth in industry, agriculture, and transportation sińce the Industrial Revolution has


nroduced additional quantities of the natural greenhouse gases plus chlorofluorocarbons and other gajjses? augmentinu the thermal blanket. It is generally dĄ. fi-oSC accepted that this increase in the^guantity of greenhouse gases is trapping morę heat and inereasing global temperatures, making a process that has been beneficial to life potentiallyaisruptiye and harmful. During the 20th cent., the atmospheric temperaturę rosę 1.1 °F (0.6°C), and sea leye^rose several inches. SoiWprojected, 1if longer-term results of global warming includelnelting of polar ice, with a resulting rise ‘ '


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in sea level and Coastal flooding; disruption of drinking water suppliąs dependent on

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snów melts: grofound changes in agriculture due to climate change; extinction of ^ *7 ^pecies as^cological niches disappear; morę frequent tropical storms; and an ® , /increasedjncidence of tropical diseases.

-rOC^wAmong factors that may be contributing to global warming are the burning of coal and

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Petroleum products (sources ofćarborTdioxide, methane, nitrous oxide, ozone);

Zz.    ^deforestation, which iner^ses the amount of carbon djgxide in the atmosphere; zh 6 -


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! methane gas released in~animal waste; and increased"cattle production, which

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