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... ions severe enough to threaten sight. This is why it is recommended to wear appropriate safety gear. Drive Shafts Shafts are a major component of the trimmer and you must pay particular attention to their durability.
Most shafts are made of hardened steel. Flex shafts generally have been ignored by industry because of their high proliferation. As long as the shaft is labelled as a strong, reinforced unit, it should have no problems with breakage. Benefits you gain with flex shafts are the anti-vibration and shock-absorption characteristics that offer you comfort and help prevent gear and clutch wear and damage. In addition, if a drive housing on a flex shaft is bent, you can continue to operate it. However, if the drive housing gets bent on a solid-shaft unit, you must immediately replace it.
Fuel mix With 2 -cycle machines, such as trimmers, most manufacturers recommend using the highest-quality gasoline and oil in the proper ratio. However, it is also important to use only those products specified for trimmers and 2 -cycle engines. For example, although there are high-quality oils designed for outboard engines, you shouldn't use those oils for 2 -cycle engines. Another thing you should be aware of is that some manufacturers double the life of their warranties if you use oil that they sell or produce. Another benefit of higher-grade oil is that it produces fewer emissions. This issue certainly will affect all of us before the end of the next decade as new emission regulations take effect.
With regards to fuel, some manufacturers believe that you should stay away from alcohol-based petrol. They argue that this type of gasoline is hard on fuel systems and disintegrates fuel lines and petrol cap lids. It causes vapour locking. When oil is added to such fuel in 2 -cycle engines, they don't stay mixed as well and tend to separate over time. The latest trimmers have relatively similar designs but can be petrol powered or electric depending on consumer preference, such as these one made by stihl. Specifically electric trimmers are also made that have the motor mounted very low to the base having no need for a long drive shaft just the head connected straight onto the engines spindle.
Makita Electric Trimmer The materials and components: Engine: Is made up of a variety of materials, Metals: Aluminium is used in the piston of the engine as it is light and is a good conductor of heat. Cast iron is used as the cylinder face, as it is hard wearing. This cast iron is an insert that has been pressed into the Aluminium barrel. Platinum has been used in the spark plug electrode as it is very chemically inert, hard wearing and can withstand high temperatures.
However Platinum is more valuable than gold. Copper: is used in the electric motor as a coil to generate an electric field and rotate between two magnets so that rotation occurs. Iron: magnets for use in the electric motor. Ceramics: have been used in the spark plug as an insulator to keep the spark were it is wanted and to prevent heat damage to the electrode. Plastics: such as in the engine cover; is made of a thermosetting plastic since it must withstand the high temperatures generated by the motor or by sitting in the sun for long periods. Rubber: is a hydrocarbon and is used as an insulator in the spark plug lead as it is flexible and can withstand vibration.
Throttle: is made of steel or of a hard plastic depending on the model and manufacturer it really make no difference except that steel with last longer and plastic may be more comfortable to hold. Handle: Is usually made out of bent aluminium tubing covered in a coating of foam with a vinyl layer on top for good grip and comfort. Foam is basically latex that has been aerated with millions of air bubbles when being set. Polymerising vinyl chloride gas makes vinyl. Drive Shaft: Is made of hardened steel. So that it will withstand the twisting forces of the engine trying to rotate it.
The basic process of hardening steel by heat treatment consists of heating the metal to a temperature at which austenite is formed, usually about 760 to 870 C (about 1400 to 1600 F) and then cooling, or quenching, it rapidly in water or oil. Such hardening treatments, which form martensite, set up large internal strains in the metal, and these are relieved by tempering, or annealing, which consists of reheating the steel to a lower temperature. Tempering results in a decrease in hardness and strength and an increase in ductility and toughness, this is done to prevent facture's. Shaft housing: Is made of rolled Aluminium as this is very light and thus has an excellent strength to weight ratio. This is important as users do not want to have to carry around a very heavy piece of equipment nor do they want a material that will fail easily. Hans Christian Oersted, a Danish chemist, first isolated aluminum in 1825.
Aluminium is refined from bauxite. Head: The head of the trimmer is used to hold the nylon line. The head consist of several different components depending on the type of head. Plastics: a thermo setting plastic that is very resistant to abrasion and is not brittle so that fractures and wear is minimal. Sometimes melamine formaldehyde is used but wide ranges of plastics are used because of the diversity of manufacturers. Metals: Springs are used in semi automatic heads to return the bump button back to its original position.
A steel bolt is also used to attach the head to the drive shaft. Line: The cutting line is made of nylon. Nylon is a polyamide, they consist of highly ordered molecules, which give high tensile strength. Polyamides are made by reacting di carboxylic acid with diamines (carbon molecules with the ion NH 2 on each end). Other types of nylon are synthesized by the condensation of amino acids. Polyamides have mechanical properties such as high abrasion resistance, low coefficients of friction (meaning they are slippery), and tensile strengths comparable to the softer of the aluminum alloys.
Therefore, nylons are commonly used for mechanical applications, such as in lawn trimming. All these materials have improved over time due to advancements in manufacturing and design techniques such as CAD and CAM (Computer aided Design/Manufacturing) With the complexities of the internal combustion and electric engine the presence of simple machines can also be found. Lever: the way in which the trimmer is held gives the action of a third order lever when holding the trimmer stationary to keep it upright. The action of a third order lever is repeated when moving the head of the trimmer from side to side to cut the grass. The wheel action is used in the rotational motion that is created by the engine and transferred down the drive shaft through the head and rotates the nylon line at high velocity to cut the grass, pretty simple really. Bibliography web > web > web > web > web > Introduction To Materials Science SI edition, Schlenker 1983 web > web > Mr Patrick Clark Mr Ian Stones Britannica Encyclopaedia How things work, Ian Graham 1993 Collins eyewitness guides: Car, Richard Sutton 1992
Free research essays on topics related to: spark plug, cast iron, high temperatures, shaft, electric motor
Research essay sample on Spark Plug Cast Iron
