Steel Tip - You have two options with steel tip darts. Fixed point or a moveable point. A fixed point is when the point is fixed into the dart and it does not move. This is the most common type of dart. Moveable points move. They are designed to help decrease the chance of bounce-outs.

Steel tip darts are mostly used with bristle dartboards and can only be used on electronic dart boards surfaces. Steel tip darts have a very sharp steel point to stick in the fiber of a bristle board. They can be complex with as many as five completely separate removable parts, and can be tuned for performance. Many models are available in different weights. Steel tip darts can be made of brass, nickel - silver, tungsten, and copper.

Soft Tip - Unlike steel tip, the difference is in the width of the opening of the barrel, not the action of the point. You have two choices here, either 1/4" or 2BA. 1/4" is the wider of the two choices. 2BA is much narrower and is much more common.

Soft tip darts are mostly used with electronic dart boards. Soft tip darts have a flexible, plastic tip on the end to easily lodge into the holes on electronic dartboards. Usually lighter than steel tip darts, soft tip darts can be weighted differently, and be as complex. Soft tip darts can be made of plastic, brass, nickel - silver, tungsten, and copper.

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Dimplex Flights: and other similar styles are actually hard flights which have been embossed with a texture. The bumpy or ribbed surface tends to stiffen the flight, which some darters consider desirable. The extra surface area also adds a small amount of drag to the flight, which makes the dart slightly more stable in some cases. The various embossed types of flights are generally a little harder to insert into a metal shaft, due to increased thickness. Use a dart tool or knife blade to gently spread open the slots at the back of the shaft.

Flight Protectors: are small metal or plastic devices that fit over and protect this area. The life of a set of flights may be greatly extended by using Flight Protectors. They are also reusable and may outlast many sets of flights.

Soft Flights: are made of a flexible plastic sheet, preprinted with a variety of designs and then folded into shape. Adhesive (glue) holds the layers of plastic together. If the flight is torn during use, the layers can be pressed together with fingers and the adhesive will "heal" the tear. Another benefit of this type of flight is that a Soft Flight will often flex out of the way if another dart hits it. These flights are available in hundreds of bright, attractive designs. Also known as "Reseal Flights".

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There are many materials of flights in tungsten dart.

Hard Flights: made of a stiff polyester plastic that holds shape well. The layers are permanently sealed together by heat during manufacturing. Because the plastic is harder, they don't tear as easily as Soft flights however if they do tear, they cannot be resealed and are ruined. Hard flights do not flex like Soft flights when hit, but do "pop off" the shaft when hitting another dart. This is desirable as it reduces deflection and allows tight groups. Hard flights were originally made of a clear plastic, which resulted in fairly dull colors in printed designs. During the last few years, Melinex, a type of opaque plastic, has been used for printing hundreds of brighter designs.

Nylon Flights: made of rip-stop nylon fabric. These dart flights are very hard to tear. The stiffness varies according to the weight and type of fabric used by the manufacturer, but is roughly midway between Soft and Hard flights. The most common point of wear with this flight is at the front, where it is inserted into the shaft. Since rip-stop nylon fabric is a thicker material, it is important to pry open the slots on the shaft for a properly loose fit to avoid damage to the flight. Nylon flights are extremely common and available in thousands of different designs.

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Shafts play an important role in tungsten darts. There have many materials shafts:

Plastic Shafts - Inexpensive, and available in many colors, but break fairly easily. Good shafts until you start throwing tight groups and breaking lots of shafts. Materials are usually polycarbonate or nylon, some have replaceable tops for greater longevity.

Composite Shafts - Composite type shafts, like the Alamo or Quiver, have plastic bases that thread into the darts, combined with aluminum or other metal alloy tops that hold the flight. These are excellent shafts, quite durable, and will not vibrate loose as easily as solid aluminum shafts. Generally available with replaceable tops for economy and convenience.

Solid Aluminum Shafts - More rigid and durable than Plastic or Composite shafts, in many styles, some with decorative engraved stripes, spirals, etc. They may tend to vibrate loose, especially on heavier darts. When used with thick flights, such as Dimplex or Nylon, the slots may need to be pried open slightly, with a dart tool or knife blade. Will normally bend instead of breaking when hit; just straighten for more use.

Aluminum shafts often vibrate loose when playing, so rubber O-ring lock washers are highly recommended. This only occurs when there is a metal-to-metal contact, so plastic shafts do not normally need the lock washers.

Spinning Shafts- A variety of shaft styles are now available, that allow the flights to turn out of the way when struck by another dart. Spinning shafts do nothing to improve the flight of the dart through the air, but they do allow tighter groups by letting the flights align with each other. Also, these shafts will greatly reduce torn flights.

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For everyone who serious about the game of darts, then they want to make sure that their dartboard setup is at the correct Dart Board Height and Dartboard Distance. The bull's-eye must be 5ft 8in (173cm) above the floor. This should put the bull's-eye approximately at eye level for most people. The front of the dartboard to the Oche (Throw Line) is the Dartboard Distance and must be 7ft 91/4in (237cm). This is especially important, for people who want to make sure that you have an official dartboard setup.

It’s also important to consider putting a dart mat behind the dart board. This will help keep the vibrations or the movements of the board from creating damage in the walls of home. And remember that when throw a dart there is a lot of force that is dissipated from the momentum of the dart. If someone does not have a mat behind the board, then this could cause damage to walls.

Now that understand how to appropriately have dartboard setup done in home and what the correct Dart Board Height and Dartboard Distance is, let’s take the appropriate steps to do so. It's important that consider the location of dart board so that do not damage anything or hurt anyone. It's also important that have the appropriate distance from the dart board to throw darts.

If there have tiles or laminated floors that could get damaged or do damage to darts then it would be wise to put a rubber bat or even a carpet on the floor. This will stop the dart points from getting dull and will minimize the darts sticking into the floor.

It is always a good idea to mount a black board next to the dart board to help easily keep score when you are playing darts games. The reason why black board work better than paper is when game’s over, we can just wipe away the writing and start all over again. no one can accuse others of cheating, because everyone can see clearly what have written down.

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There are large deposits of tungsten ores in the USSR (Transbaikalia, Middle Asia, Kazakhstan, Primor’e, and the Northeast), the People’s Republic ofChina, and the Korean Democratic People’s Republic. Capitalist countries prominent for their reserves and mining of tungsten ores (1966 output in tons ofWO3) include the USA (4,852), Bolivia (1,580), Australia (1,326), Portugal (1,199), Peru (437), Thai-land (336), and Burma (207).

 

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Tungsten copper contacts are made of tungsten and copper, having excellent properties, high temperature properties of tungsten is one of its most important advantages, and its conductivity improved with the increase of copper content.

Tungsten owns high melting point, high hardness, high boiling point, high strength, low thermal expansion coefficient and other characteristics.
Copper owns good electrical conductivity, thermal conductivity and good ductility characteristics.

The performances of tungsten copper contacts are listed below:
Having a high density, high melting point, high hardness, high boiling point, and high strength;
Excellent short arc performance;
Having good thermal conductivity and nice electrical conductivity;
Having a smaller thermal expansion coefficient;
It has excellent resistance to arc erosion;
Good anti-welding resistance;
With a high temperature non-softening properties;
Good workability;
It has a certain plasticity and good high-temperature strength.

At a temperature above 3000 ℃, the copper in tungsten copper alloy will liquefy, evaporate and absorb a lot of heat, thus reducing the surface temperature of the contact material, and therefore such material is also known as metallic sweat material.

 

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Endogenic deposits of tungsten are postmagmatic, pneumatolytic, or hydrothermal and are genetically associated with granite intrusions. The following types of tungsten ore deposits are differentiated: albitized, greisened, and silicified cupolas and stocks of granites or granitized porphyry, containing finelydisseminated wolframite and some-times thin quartz-wolframite veins and forming a stockwork; quartz-feldspar, quartz-topaz, quartz-fluorite, and quartzveins, often with greisen selvages containing wolframite and rarely scheelite, cassiterite, beryl, arsenopyrite, bismuthinite, molybdenite, pyrite, and othersulfides; quartz-scheelite veins, mineralized zones, and stock works, often containing sulfides; quartz-gold-scheelite and quartz-antimonite scheelite bodiescontaining ferberite, antimonite, cinnabar, and barite; and scheelite-containing scarns of garnetpyroxene-scapolite composition, containing molybdenite,chalcopyrite, galena, and sphalerite. The richest are deposits of the vein type, which often contain up to several percent WO3. The largest deposits are theskarn and stockwork types. Deluvial and alluvial placers containing wolframite and scheelite may form because of erosion of direct deposits.

 

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Tungsten copper contacts own excellent performance of copper and tungsten, such as, high melting point, high boiling point, high density, low vapor pressure, good electrical conductivity, excellent thermal resistance and arc-erosion resistance, anti-welding performance and ease of processing etc., which can be used in low and high voltage switches, other electrical appliances and some instruments, it acts as a contact material. In recent years, with the higher capacity and higher voltage requirements of switches and other electrical appliances, people have constantly improved the technical performance requirements of tungsten copper contacts. What’s more, with the rising of the cost of tungsten and copper, the costs of contacts materials also rise sharply; therefore, better production processes to reduce costs should be raised.

Tungsten copper contacts can be used not only in strong and weak electricity, but also in DC, for DC, requiring them in the DC condition, material transfer from one end of the contact to the other should be small. The maximum appliances of tungsten copper materials is in contacts, especially the content of copper is between 20% to 40% of tungsten copper materials, which is mainly used in high voltage, high current switches and other electrical appliances, such as protection circuit breaker contacts in grid and other contacts. Tungsten copper contacts containing 15% to 20% of copper can be used at a voltage of up to 500 000 V or higher on the circuit breaker.



 

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Tungsten copper contacts are fake alloy which having high electrical conductivity and thermal conductivity of copper and having a high hardness, high melting point, high density, arc erosion resistance and other excellent properties of tungsten. Because it combines the excellent properties of tungsten and copper, which has anti-welding resistance, arc erosion resistance and other properties, and it can be used as the contacts of the weak and strong electricity.

Contacts for strong electricity, the main performance requirements described as bellow:
1. In order to prevent tungsten copper contacts overheating when a rated current through the contacts, it should have a low contact resistance;
2. In order to make it have a long life, its mechanical wear rate and electrical wear rate should be smaller;
3. With good anti-welding performance, in case of failure, the contacts are able to successfully break the circuit;
4. Requests the residual current should be small and its interrupter ability should be strong, so that it can interrupter quickly when it breaks a large current, and does not cause re-ignition or continuous current.

Contacts for weak electricity, the main performance requirements described as bellow:
1. Should have low and stable contact resistance;
2. Should have a smaller electrical wear rate in order to prolong its life;
3. Have a higher minimum arcing voltage and the minimum arcing current so that the contacts can be operated without arc;
4. Because it has a small closing force, so that its mechanical wear is less.



 

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