The string trimmer , also called "weed-whip ", " whipper-snipper ", " weed-whacker " , a "bob weed ", "barber trimmer " (in Australia) or " strimmer " (in English and Irish), is a tool that using a flexible monofilament line rather than a knife to cut grass and other plants near the object, or on steep or irregular terrain. It consists of the cutting edge at the end of the long shaft with the handle.
Video String trimmer
History
The rope trimmers were discovered in the early 1970s by George Ballas of Houston, Texas, who conceptualized the idea while watching the act of spinning a cleaning brush in automated car washing. The first trimmer is made by attaching a heavy duty fishing piece to a popcorn that can bolt into an edger. Ballas developed this into what he called "Weed Eater", because he chewed grass and grass around trees.
Maps String trimmer
Design
The rope trimmers work on the principle that the lines that are rotated fast enough to be held out of the house (spinning reels) are very rigid by centrifugal force. The sooner the line is stiff. Even the round-section nylon strip is capable of mowing the grass and a bit, the woody plant is quite good. Some monofilament lines designed for stronger cutters have extruded shapes, such as stars, which help cut lines of cut material; this line is capable of cutting large wooden crops (small shrubs) or at least barking very effectively. These lines make the disk less necessary for a difficult job.
The line is winding the hand into the coil before work begins, leaving both ends extending from the reel house. The motor rotates the reel and the line extends horizontally while the operator swings the trimmer about where the plant should be trimmed. The operator controls the height of the cutting place and can trim it to the ground easily.
Since the line is worn, or is disconnected, the operator taps the coil on the ground so that the release mechanism allows multiple lines in the roll to extend and replace the spent portion. The newer model has an 'automatic feed' operation where a small cutter on the line guard ensures that the length of the line open to the cut does not exceed the length that the motor can efficiently swing. The newly extended line operates more efficiently due to its heavier weight and surface effects. Spinning center speed is usually controlled by a trigger on the handle.
For vertical cutting the entire machine can be tilted or some trimmers allow the head to be adjusted at different angles. Vertical cutting is not recommended near sidewalks or edges of concrete and other sidewalks, because the leaves are open allowing water to collect and cause damage.
The rope cutter supported by the internal combustion engine has a machine at the opposite end of the shaft from the cutter head, while the electric rope cutter usually has an electric motor on the cutter head, but several other arrangements also exist. One is the setting where the trimmer is connected to a heavy machine and is powered using a hydraulic motor.
The head contains a user-side safety shield and a rotating hub that can also be called a head or a spool. The disadvantages of a gasoline-powered string cutter include the greater weight and significant vibrations that carry the entire device, both of which interfere with maneuverability and contribute to muscle fatigue, as well as the need that motor oil is added to the fuel (if equipped with a two-stroke engine). Benefits of gasoline-powered trimmers include mobility (because they are not plugged into an electrical outlet) and higher maximum power.
Large trimmers, used to cut grass on the roadside in large areas, are often heavy enough to require two hands to operate, and some are even equipped with bridles that allow the user's body to bear some of their weight. These very large trimmers are often referred to as brush cutters. This type of brush-cutter is usually made so that the metal blade can be attached instead of "string" (or monofilament). Metal knife allows cutting thicker wooden brushes.
Trimmers that have nylon or metal blades usually require straight driveshafts to handle the higher torque required to play the heavier disks, and because the shock loads are passed back from the blade to the drive shaft and gearbox (es). The smaller line trimers have curved driveshafts to make the cutting head handle on the ground surface much easier and with less pressure on the operator.
Accessories
Many rope trimmers allow the hub, head or bottom of the shaft to be replaced with an accessory. Common accessories include:
- replace the monofilament line with a metal or plastic strip.
- replace the lower axle with a small chain saw to make a power pole saw.
- replace the bottom axle with the hedge trimmer.
- replace the lower axis with a cultivator.
Fast release shafts are offered on many new models that do not require any tools to change accessories.
Power and emissions
Gasoline-powered trimmers typically have a displacement motor of at least 21 cc. At this size they can easily change the 2-millimeter (0.079 inch) line and some have nylon blades as accessories on the coil-lines. The 32 cc engine can swing lines 2.75 mm (0.108 inches) and often has a metal-blade accessory. Most trimmers use two stroke engines and require gasoline mixed with oil. Due to the pollution laws, the four-stroke engine became more popular with a number of commercial grass feeding models now supported by four propulsion engines. For example, Honda, MTD, and Craftsman produce four-step engine trimmers. Other companies, such as John Deere, now bring in two-step low-emission machine trimmers. Stihl manufactures a hybrid four-step machine trimmer using a technology called 4MIX. The 4MIX trimmer does not have an oil reservoir. This machine is lubricated using pre-mixed gasoline, like a two-stroke engine.
Electrical edge cutters have the advantage of being a very lightweight, easy to maneuver, and easy to operate. However, the length of power cords that can be used on the ground limit them, and they are usually less powerful and stronger than the gasoline engines. The electric engine is usually limited to 2.5 mm (0.098 in) the maximum diameter of the nylon due to lower power output (400 to about 1200 watts). Recently there is a power cord cutter that offers the same performance as a gasoline powered trimmer. The battery-powered unit must be recharged after each use. Charging time is usually several hours; some models offer quick charging options that cut charging times up to between 30 minutes and 2 hours, or removable batteries so that users can have more than one ready-to-exchange battery when the first one goes down.
The two-cycle machine commonly used on the rope cutter contaminates a lot because of incomplete combustion in the cylinder. This produces unburned fuels that go out through the exhaust system and into the environment. US emissions standards specifically limit emissions from small engines. The electrical model does not produce emissions at the point of use. Battery-powered units typically use small or large closed lead acid, nickel metal hydride, or lithium ion batteries.
Microplastic pollution
The rope cutter has long been a source of serious environmental pollution, since strings are continuously cut into microplastic
Security issues
The rope cutter can be a dangerous tool due to the fact that they can cause flakes, including rocks and stones, to fly in several directions. For this reason, it is typical for people who use rope trimmers to wear safety or protective goggles to protect the face and especially the eye as a stone in the eye can cause a person to be blind for life. This, however, does not offer protection for passersby, or those closest to whom may also be vulnerable to debris from rope trimmers. In addition to the security risks for people, debris from rope trimmers also has the potential to cause damage to cars and buildings, with a high risk of breaking the window glass.
Chain-link flail rotor, and other trimmer heads with associated metal parts are prohibited from being sold in the UK and EU member states once identified as a serious security risk. It follows a fatal accident in 2010 in which parts of the chain become separated from such rotor and hit nearby workers at high speed, thus injuring itself by shutting down.
Other uses of the string trimmer
- The machine from the rope cutter can be used to drive a DIY motor bike.
- The string trimmer can be used to support the controlled radio model.
- A 0.65mm trimmed line spin can be used instead of nibs for the Wacom image tablet pen.
- Trimmers of various thicknesses can be used as filaments for 3D printers.
See also
- Brushcutter (tool garden), heavy duty tool that can take the head of the line trimmer or various other blades
References
External links
- Media related to the string Cutter in Wikimedia Commons
Source of the article : Wikipedia
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