The requirements of tungsten points’ material on switches and appliances are shown as follows:

1. Mechanical properties requirements: High temperature resistance, high hardness, good ductility and excellent toughness and other performance requirements.

2. Physical properties requirements:
With low resistivity, high boiling point, low vapor pressure,  good thermal stability, large heat capacity,  high melting point, good thermal conductivity, a high electron work function and other performance requirements .

3. Chemical properties requirements:
With good corrosion resistance; not easily oxidized in the atmosphere, curing, carbonization and difficult to form conductive compounds, if the phenomenon appears, it should have high volatility.

4. The electrical contact properties requirements:
With arc erosion resistance, welding and small metal transfer tendencies, low and stable contact resistance and other performance requirements

5. Processing performance requirements:
With easy brazing and welding performance requirements and others.



 

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The following are some main points of the performance requirements of tungsten contacts material on switches and appliances:

1. Mechanical properties: High temperature resistance, high hardness, good ductility and excellent toughness and other performance requirements.

2. Physical properties: A high melting point, high boiling point, low vapor pressure, low resistivity, good thermal conductivity, large heat capacity, good thermal stability, a high electron work function and other performance requirements .

3. Chemical properties: Good corrosion resistance and they are not easily oxidized in the atmosphere, curing, carbonization and they are difficult to form conductive compounds, if it occurs, they are required to have a high volatility.

4. The electrical contact properties: A low and stable contact resistance, arc erosion resistance, welding and small metal transfer tendencies and other performance requirements

5. Processing: With easy welding performance requirements, brazing and other methods can be used.



 

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6. Overhaul the capacity of capacitor.
Placing the capacitor flatly on the cylinder head and grounding the housing, and then aligning the high voltage bus with capacitor wire head about 5mm. Then you should strike the tungsten points of the distributor, so the high-voltage current can charge in the capacitor by 4-5times. You should move the head of capacitor wire into the housing of 3mm around. If the following phenomenon appears: Flashover, with weak, dark red spark and small sound, it shows that the capacity of the capacitor is small and you should replace it; if the capacity of the capacitor is large, the following phenomenon will appear, and it shows that you don’t need to change it. Phenomenon: flashover, with louder sound and blue sparks.

7. Overhaul the connection of battery wire.
You should eliminate the oxide of each wire connector and tighten the wires.

8. Overhaul the generator.
In order to avoid the situation that the engine is operating in a low speed for a long time, you can increase the contact gap of tungsten points appropriately.



 

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4. Overhaul tungsten points’ ablation on tungsten contact spring arm in distributor.

Check the gap of tungsten points when there are no spring balances. It is a normal value if the gap is bigger than 0.37mm. Close the tungsten points, and then strike tungsten points by hand to test fire. If the tungsten contact spring arm is too soft, there will be a strong high voltage spark.

Or use a spring balance, if you have one, to hook one side of the active tungsten contacts arm. If the indication on the spring balance does not satisfy the standard of tungsten contacts of the car model when the contact is opened, it should changed; On the contrary, it doesn’t need to.

5. Overhaul capacitor ground.

Fastening the capacitor case and tightening the wire point orderly.



 

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2. Overhaul tungsten points’ ablation on riveting loose or bracket set screw loose.

Opening the distributor lid, inspecting the situation of tungsten rivet and points bracket set screw loose condition, then pulling the two tungsten points back and forth. And then removing tungsten points, and re-riveting to make it no loose, or changing tungsten points directly when the tungsten points are loose.
Tightening the tungsten points’ bracket set screw when they are loose.

3. Overhaul the skew and offset situation of contact surface.

Opening the distributor lid, the first thing is to inspect the offset and skew situation.
Adjusting the gasket of active tungsten contact arm when the contact surface offset.
Using pliers for twisting tungsten points frame to correct them when the contact surface of tungsten points has skew or excursion.



 

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Founded in 1973, THE BRITISH DARTS ORGANIZATION (BDO) is recognised globally as the world’s leading darts organization with over 1,000 officials and a calendar that produces in excess of EIGHT HUNDRED darts events annually.
 

The BDO is firmly established as governing body for the sport of darts in Britain, and as such is fully committed to regulating, organizing, promoting, staging, administrating and fostering darts nationally, internationally and worldwide for men, women, boys and girls to ensure the on-going growth of the sport for all participants irrespective of gender, age or ability.
 

The BDO represents darts from grass roots right through to professional standard. As such it is all-inclusive and representative of the sport. The BDO comprises sixty-six member counties in Britain, and has sixty-nine associate countries worldwide. Each BDO county stages its own domestic events, with some staging open events for men, women and youth. Each county has a Super-League for men and women and some have their own youth sections.
 

The BDO is administered by a board of directors, democratically elected annually at its AGM. It is funded by subscription from its member counties, and also receives revenue from various sponsors, etc.
 

As for professional game of dart, we recommend tungsten dart, tungsten is an extremely dense metal. It is also very durable, so a high-density tungsten dart resists wear and the knurling will last much longer.

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1. Overhaul the contact gap of tungsten points in distributor.

Firstly, opening the cover of the distributor, then shaking and rotating the engine, overhauling whether tungsten points of the distributor is in good state, and checking the contact gap, if the gap is less than 0.37mm, you need to check the degree of tungsten points ablation, if not, you don’t need to.

If the degree of tungsten points ablation is severe, then:
putting on the gloves and removing the tungsten points, and placing them on a flat stone;
pouring some oil in your hand, and pulling back and forth to polish tungsten points and to prevent partial wear, besides, you must not swing it .

If the degree of tungsten points ablation is not severe, then:
smoothing ablation by using platinum sand bar or fine sandpaper. If you use fine sandpaper, you can turn it over, so its sand finish is outwardly to polish tungsten points, then turn it back, and erase the dirt left by milling until tungsten points are clean.



 

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Tungsten polymer (also known as tungsten poly) is a composition of various resins and tungsten powder which are mixed together through special metallurgical technology. The resins may include ABS (acryloynitrile butadiene styrene), PP (polypropylene), PBT (polybutylene terephthalate), PA (polyamide), PU (polyurethane), and TPE (thermoplastic elastomer), etc.

Properties of tungsten polymer include:
• High density ( ≥ 11.34 g/cm^3)
• Improved radiation shielding performance
• Improved flexibility properties
• Easily malleable
• No toxic constituents
• Resistance to corrosion by weather elements
• Resistant to corrosion by chemical and organic solvent resistance
• Insoluble in water
• No harmful effects when handling or processing

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Tungsten polymers are being introduced as an effective lead alternative in a variety of applications for which lead has traditionally been used. This push for alternatives is due to the threat that lead poses to the environment and to human health. Recent studies show that the heavy usage and poor disposal of lead products for decades has caused irreversible effects to the environment and as such lead is now ranked as the second most hazardous substance by the United States government. Due to tungsten polymer has high density (13g/cc), excellent radiation attenuation properties, and environmental friendly, it is widely used to produced radiation shielding to replace lead.

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In most cases, high-density materials are more effective than low-density alternatives for blocking or reducing the intensity of radiation. However, low-density materials can compensate for the disparity with increased thickness, which is as significant as density in shielding applications. While lead is the most suitable element for the prevention of the movement and penetration of the radiation there is also a better solution. Tungsten polymers are the next big thing.

The popularity of tungsten polymers is slowly rising due to the fact that tungsten is disposable unlike lead which has become an environmental hazard of late. Lead is not biologically degradable whereas tungsten is and thus the decrease in popularity. Tungsten polymers also do not pose any health risks associated with lead. The primary application of tungsten polymers is in replacing lead, for which these polymers are already being utilized extensively.

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