British Association screw threads

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Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2009) crushing machines

British Association or BA screw threads are a largely obsolete set of small screw threads, the largest being 0BA at 6 mm diameter. They were, and to some extent still are, used for miniature instruments and modelling. glass grinders

They are unusual in that they were probably the most "scientific" design of screw, with a basis in metric size (the 1 mm pitch and 6 mm diameter of 0BA) and with a mathematical relationship between the 'number' (e.g. 2BA with K=2) and the corresponding pitch, major diameter, and then spanner size. Though originally defined in terms of the imperial units then in use in the United Kingdom, this was deliberately set to be exact multiples of the metric system units, rounded to the nearest thousandth of an inch. This anticipated worldwide metrication by about a century.

The British Standards Institution recommended the use of BA sizes in place of the smaller BSW and BSF screws (those below 1/4"). Generally, the 0BA size was dropped in place of 7/32" BSF in assemblies that included larger fasteners, however, in smaller equipment that was primarily electronic/electrical the 0BA size would typically be used in place of the BSF or BSW screw where it was the largest size required.

BA threads are still used in some precision instruments, such as optics and moving-coil meters, relays etc. A 2BA thread is used to connect the head of a dart to its shaft as such, it is one of the few common uses of this thread in North America.

BA thread sizes

The pitch of 0BA is 1 mm and the pitch of each higher numbered thread is obtained by multiplying the pitch of the lower number by 0.9 so K-BA has a pitch of . The major diameter is given by and the spanner jaw size as 1.75 times the major diameter.

The shortening at the crest and root is given by 0.2681683p with a radius of 0.1808346p at both crest and root. The angle of the thread is 47.5 degrees which is different from that used by Whitworth (55 degrees) and ISO Metric (60 degrees) so BA fasteners are never interchangeable with Whitworth/Metric ones even when the pitch and diameter seem similar (except 0BA - 6 mm). Standard BA sizes are defined between 0BA and 22BA. The very small sizes are not used very often and other standards tend to be used (e.g., NHS).

BA

Outer

Diameter

Threads

per inch

Threads

per mm

Tap drill

0

0.2362 in / 6 mm

25.38

1

5.1 mm / 7 gauge

1

0.2087 in / 5.3 mm

28.25

1.112

4.5 mm / 16 gauge

2

0.1850 in / 4.7 mm

31.35

1.234

4.0 mm / 21 gauge

3

0.1614 in / 4.1 mm

34.84

1.372

3.4 mm

4

0.1417 in / 3.6 mm

38.46

1.514

3.0 mm

5

0.1260 in / 3.2 mm

43.10

1.697

2.65 mm / 37 gauge

6

0.1102 in / 2.8 mm

47.85

1.884

2.3 mm

7

0.0984 in / 2.5 mm

52.91

2.083

2.05 mm / 46 gauge

8

0.0866 in / 2.2 mm

59.17

2.330

1.8 mm

9

0.0748 in / 1.9 mm

64.94

2.557

1.55 mm

10

0.0669 in / 1.7 mm

72.46

2.853

1.4 mm / 54 gauge

11

0.0591 in / 1.5 mm

81.97

3.227

1.2 mm

12

0.0511 in / 1.3 mm

90.91

3.579

1.05 mm

External links

Bolt Science writeup.

Early history of non-metric bolts including BA and Whitworth.

Table of thread dimensions.

Recommended ISO substitutions.

Spanner Jaw Sizes Additional background information and spanner jaw size table.

International Thread Standards

Categories: Drilling and threading | Mechanical standards | ScrewsHidden categories: Articles lacking sources from July 2009 | All articles lacking sources

With the public do not recommend LCD TV features (Figure) - LCD TV, TCL TV - Network Appliance Industry-hc360 HC

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Gradually increase the standard of living, people's demand for television is not limited to television programs, more beautiful, and the pursuit of television entertainment properties. And now TV is also a rational consumer choose a number, but also a cost-effective, but also fully functional. So in the end what kind of TV you can meet these demands? In this, edit the special launch of fashion

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Shopping guide series, the quest for a variety of LCD TV's new information to hand pocket of your shot accurately, buy their most favorite products. max stapler



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TCLL52S9FE LCD TV is a television entertainment have Internet capabilities, you can access network line, online movies, download movies, you can browse the network information, weather forecasts and so on, can be said that network television is the most outstanding and the most influential of a product. If you feel at home on the computer screen is too small, large or purchase This TV viewing value for money.



The exterior design, as a very stylish large screen products, TCLL52S9FE LCD TV appearance continued

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TCL L52S9FE LCD TV



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Video download function, as long as Internet access lines together via a router, this TV will be able to automatically download audio video network, the standard test environment, 2M bandwidth of up to 200k / s download speed. TCL exclusive built "MiTV download video off the engine" to bring you the thrill of surfing the Internet movie: watching TV while downloading, support for stand-download; through the shield, download the full realization of health.



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Comments: TCLL52S9FE LCD TV as an entertainment product, not only brings joy to the family, but also shortened the distance between their families. This TV currently sold only 14,999 yuan, intended to buy This TV friends you had better seize the opportunity.

Air mattress

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For sleeping

Early air mattress by the German engineer Konrad Kyeser (ca. 1405)

An air mattress, also known as an airbed is an inflatable mattress, the wide majority of which are usually made of PVC vinyl plastic although recently developed textile-reinforced urethane plastic or rubber version exist. The deflated mattress can be rolled up or folded and carried or stored relatively easily, making them a popular choice for camping trips and for temporary bedding at home for guests. They are inflated either orally by blowing into a valve, or with a manual foot-powered or more commonly inflated via an electric pump. Some are even automatically inflating (up to a certain pressure - some additional inflation is also needed) just by opening the valve. polaris sportsman 90

The three main categories for use of air mattresses are camping, temporary home use (guests) and full time permanent use (in the bedroom). Some air mattresses are specifically designed to perform both functions (camping and guest use) while others are specifically designed for one purpose alone (permanent use in the home or RV). Other air mattresses are designed in shapes with wheel well cut outs specificly intended for use in vehicles such as pickup trucks or SUV's. antique fishing reels

Lightweight, reduced-size and reduced-thickness air mattresses specifically intended for camping and backpacking are sometimes called sleeping pads, especially when a layer of foam insulation is added under the air chambers. Better quality air chambers, that are designed for permanent use in the home, are constructed of vulcanized rubber, covered in canvas or of polyurethane. These chamber(s) are then installed into a cloth shell or tic. Permanent air beds will look almost like conventional beds with the exception of having a hose (1 air chamber) or hoses (2 air chambers) coming out of the head of the bed. These hoses will be connected to an Air Inflator, with 2 outlet valves, that will have a remote control(s) so that each person can adjust the firmness of their side to ones own exact needs. The firmness can be adjusted up or down, with the simple push of a button, on the remote(s).

Permanent airbeds were originally created for medical use, but later redesigned to work without an external power source by utilizing batteries for their power source. Because there is no need for external electricity, pumps or motors, permanent adjustable air mattresses became available for consumer use.

Some government safety agencies have warned against letting infants sleep on air mattresses, because they can be too soft and suffocate smaller children (especially those below the age of 8 months) within folds or while entrapped between the mattress and the bed case. Additionally there have been several recent governmental studies and regulations enacted due to the poisonous nature of the phthalates and dioxins contained within all PVC vinyl air beds and other soft vinyl products. The European Union has made similar efforts to prevent the use of vinyl materials in toys and bedding

Air beds

Larger, more elaborate air mattresses ("air beds") have come on the market in recent years that are intended for guest use, or as permanent beds in the bedroom. Sizes range for temporary air beds range from twin to king, however few guest bed manufacturers offer king, as the majority of guest air beds are sold outside of the United States, where king size mattresses are not standard. Most permanent air beds can use conventional (standard) sheets and bedding, which are very easy to find, for purchase. California King or Western King sheets and bedding may be more difficult to find as this size was originally conceived for the waterbed industry.

Raised guest or temporary beds are typically raised off the ground to keep users away from the floor and offer a more traditional mattress experience. Though 'raised' air beds are off the ground they are not designed for full time use, as the base of the bed is an air chamber and not a solid foundation.

An air mattress in the shape of a mobile phone.

As a water toy

The term air mattress may also refer to a certain inflatable swimming pool or beach toy, which has an air-sac "pillow" and several (usually four or five) tubes running its length. Also called a "lilo" (UK), "pool air mat", "air mat", "pool lounge", or "float(ing) mat(tress)", it is used to recline on the water surface. Although it bears some resemblance to an air mattress, it is typically not built as strongly and may not reliably stay inflated all night long, making it impractical for use as a bed.

References

Look up lilo in Wiktionary, the free dictionary.

^ Air mattress (definition on Princeton WordNet. Accessed 2008-08-10.)

^ "lilo". Compact Oxford English Dictionary. Oxford University Press. 2009. http://www.askoxford.com/concise_oed/lilo. Retrieved 2009-05-10. 

^ Deadly Danger: CPSC Urges Parents To Not Place Infants on Air Mattresses (from the Consumer Product Safety Commission government website, United States. Accessed 2008-08-11.)

^ http://www.besafenet.com/pvc/government.htm

^ http://europa.eu/legislation_summaries/consumers/consumer_safety/l32033_en.htm

Categories: Beds | Camping equipment | Inflatable manufactured goodsHidden categories: Articles needing additional references from August 2008 | All articles needing additional references

Not to be outdone local firms competing LED color TV market intensified-LED TV, Skyworth TV - Network Appliance Industry-hc360 HC

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Samsung

, LG, Toshiba and other foreign brands, launched its latest LED TV; Skyworth cotton drill

Konka cotton seersucker

, Hisense large screen LED

TV

Holiday launch offer. Reporter yesterday (December 24) to the number of electronic shopping to see Huaqiang North,

Flat Panel TV

In the end the end of every end-market competition intensified, foreign brands have increased market competition for, LED

LCD TV

A turbulent time. Represented by Skyworth is a high-profile domestic brands said LED backlight modules in advance, while the project will open up the LED industry chain, to improve market competitiveness.



LED TV scramble round started



"LED TV battle has fully started." Samsung, LG and other Korean giant, fat, force this year, China's first LED TV market, and promote the traditional LCD TV to a higher level of LED LCD TV upgrade. Skyworth, Hisense and other domestic brands have also launched large-scale LED LCD TV.



"2010 years will be foreign LED TV showdown of the year." Yang Dongwen, vice president of Skyworth Group, said, according to the Consumer

Electronic

Industry general rule, LED LCD TV will replace the traditional liquid crystal into the high growth period. From the investigation agency's latest data show Displaysearch, 2008 share of the global LED backlight is only 6.7%, in 2009 has risen to 27.8%, next year for the first time over the traditional backlight, share raised to 56 %.

LED LCD TV

fancy cake, Chinese and foreign brands to enhance the layout. Yang Dongwen said Skyworth 2010 LED LCD TV shipments will reach 2 million units, accounting for Skyworth LCD TV shipments in the three percent.



Open up the LED industry chain and gain the initiative



It is noteworthy that, in the foreign LED LCD's this confrontation, foreign giants from the current situation in the field of LED LCD backlight has a certain advantage, while China's color TV giants will mainly depend on the way outsourcing LED backlight to participate in the competition, many domestic low-cost TV companies is the main way to snatch the market.



"LED LCD TV competition will undermine the competitiveness of domestic flat." Expert pointed out that in the highly competitive TV market, the lack of control of LED backlight is clearly passive domestic brands. To truly grasp the LED LCD TV market dominance, the Chinese color TV giants have to enter the LED upstream.



"Skyworth will be a breakthrough in the LED industry to win the initiative." Skyworth Group Chairman, President, said Zhang Xuebin, Skyworth LCD module layout has been completed, are currently planning to enter by way of equity participation

LCD panel

Areas in order to achieve full distribution in the LED field. "This will be Skyworth TV in their main area of another major investment." He said, will actively participate in the next LED Skyworth

Illumination

Application, or even involved in the field of LED chip package upstream.



LED TV prices will be lower



"Competition will be the biggest beneficiaries of the consumer." Experts, led to rapidly rising share of LED backlight the main reason, in fact, the decrease in price is greater than the traditional LCD TV backlight the decline . Displaysearch Hsieh, vice president of Greater China, said to the first quarter of 2010, 40 inch LED backlight module, and the same size CCFL (cold cathode fluorescent tube) spreads from 140 dollars in the third quarter dropped to 100 U.S. dollars, and to spread of both the end of 2010 will drop to 40 dollars more within. "



According to the forecast Displaysearch the next quarter the price of 40-inch LED backlight Jiangzai decreased by 50 dollars, with the decline in the price of LED backlight modules, LED LCD TV LCD TV prices and general price gap will narrow. At present, domestic brands represented Skyworth has been the first to cut prices.