What is a lawn mower? -- Part 1

Lawnmower (mower) using one or more rotating blades of grass cut into uniform height of the surface of the machine. The height of the cut grass can be obtained by the mower on the design, but in general can be adjusted by an operator, usually by a single main lever, or by each machine a lever or wheel nuts and bolts. Leaves can be powered by the muscles, mechanically connected to the cutting blade, so that when the mower is pushed forward, the blades rotate, or a machine with a battery-powered or plug-in electric motor wheels. Mower is the most common source of power is a small (typically a cylinder) internal combustion engine, particularly for large, self-propelled mower. Small mower often lack any form of propulsion, human needs, in order to move on the surface; "hands on" self-propelled mower, requiring people can only go in the back, and guide them. Larger mowers usually either self-propelled "hands on" type, or more often, is "sitting" mowers, equipped so that the operator can take the mower and control it. A robot mower ( "lawn-mowing robots", "mowbot", etc.) are designed to operate entirely or itself, or less commonly by the operator via remote control.

Many lawn mowers include other features, such as grass clippings or mulching grass clippings to collect their bags or boxes in a movable.

To be continued...

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Safety concerns of a string trimmer

Trimmer can be dangerous tool, due to the fact that they can cause debris, including rocks and stones, to fly in several directions. For this reason, it is typical of who is using a string trimmer or wear safety glasses or a visor to protect face, especially the eyes of the stone may cause eye blinded by a person for the life of the people. However, this does not provide the passers any protection, or people in the vicinity who might easily be hit by debris from a string trimming. In addition to constituting the individual human security risks, debris from the string trimmer also has to cause damage to cars and buildings, the risk of broken window glass of a particularly high potential.

Link flail rotor, metal parts and any other trimmer head with links are followed them identifiation is a serious security risk to prohibit the sale from the UK and the EU member states. This is the second fatal accident in 2010, which has become a link from such a rotor off, hitting the vicinity of workers enough speed caused fatal injuries.



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Power and emissions of a string trimmer

Gasoline engine powered trimmers usually have a minimum 21 ml displacement motor. At this size, they can easily be 2 mm (0.079 inches) and some nylon line as an attachment to the wire spools. 32 cc engine can swing 2.75 mm (0.108 inches) line, often with a metal blade parts. Most pruning and demand the use of two-stroke engines blended gasoline and oil. Since the four-stroke engine pollution laws are becoming more popular. For example, Honda, MTD and artisans four-stroke engine tuning. Other companies, such as John Deere, now with low-emission two-stroke engine trim. Steele called 4MIX production and use of hybrid technology, four-stroke engine tuning. 4MIX cut no oil. This engine is used pre-mixed gasoline, two-stroke engine lubrication.

Electric trimmer has a very light, easy to maneuver and the advantages of easy to operate the equipment. However, the deployment of power line length limit them, they are usually less powerful than gasoline engines and robustness of those on the ground. Nylon motor is generally limited to 2.5 mm (0.098 inches) in maximum diameter, because of their low power output (400 Watts to about 1200). Recently, electric trimmers offer the same performance as gasoline-powered trimmers. Battery-powered unit is recharged after each use. Charging time is usually a few hours long; when a run down of some of the first models offer to reduce the charging time is 30-2 minutes, or removable battery pack that allows users to have multiple battery ready to swap out between fast charging options. [Citation needed]

A typical two-stroke engines used in pollution on secateurs serious, due to incomplete combustion in the cylinder. This results in unburned fuel through the exhaust system and escape into the environment. US emission standards specifically limit emissions from small engines. Electric vehicles produce no emissions when in use. Battery-powered unit is usually small or large sealed lead acid, nickel metal hydride or lithium-ion battery.



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Use and maintenance of drill

Drill Caution:

1.Clean work area.

2.Do not rain, excessive moisture or flammable liquids and gases places.

3.Power cord away from heat, oil and sharp objects, the power cord is damaged must be promptly replaced, do not touch with bare conductors to prevent electric shock.

4.Tool when not in use and stored in a dry place out of reach of children.

5.Do not exceed the tool's ability to work to use, do not use small power tools to do a large work load to avoid damage.

6.Do not use this tool to do work beyond their capabilities.

7.Work wear overalls and wearing protective glasses.

8.Tool when not unplug the power cord to prevent accidental activation dangerous.

9.Be sure to replace the drill bit when the power is turned off before installation.

Drill Maintenance:

Drill due to ventilation, dust inside the long-term use very much, lubricants dust make gears and bearings (sleeve) on a dry mix deterioration increased wear, particularly the use of alternative even more. To guarantee the accuracy of the rotation of the drill, because reducing bearing (sleeve) and excessive wear of the gap, it is highly desirable to keep the interior clean and greasing lubrication.

method:

1)Loosen the outer drill a few nails or self-tapping screw; wherein the flat half shell opened; general hand drill new structure is a semi-recessed, that all mechanical and electrical components are means in the other half shell;

 

2)Carefully remove the first brush, then won the drill chuck side, then gently lift the motor rotor removed (not bruised enameled), wipe clean the commutator (in contact with the carbon brush that is) on the rotor, if dirty or badly worn first with sandpaper or emery cloth polished with water metallographic sandpaper to light.

 

3)Front rotors, rear bearing if it is sealed to the outside can be wiped clean, if the seal is broken should be promptly replaced. The helical axis of the rotor before wiped clean.

 

4)The casing of the oil clean wipe clean. The drill chuck rod helical gears and bearings at both ends (or sleeve) clear wiped clean.

 

5)Replace the removed stuff, first with the rotor; refill drill chuck helical gear lever; loaded brush, brushes if less than 7-8 mm should be promptly renewed.Brush installed to flatten, the last may seek out the grease is applied between the gears and bearings (or sleeve) to all parts installed flatten check to cover the other half is correct, tighten the screws, turned by hand feel no jamming, it can turn power on again.

 

 

Removing the hand drill is prohibited under power! No electrical basics are never hands!

Drill operation safety rules:

1.Personal protection when using power drill

 

1)When the face-up job, you want to wear a protective mask. On the cast iron drilling to wear protective glasses to protect the eyes.

 

2)Bit holder should be properly installed

 

3)When the job is in the drill burning state, it should pay attention to skin burns.

 

4)Handheld drill drill Φ12mm above should be drilled using a pistol with a side handle drilling.

 

5)Standing on a ladder or work should be prepared to work at heights falls measures ladder should be ground personnel support.

The accessories of a string trimmer

Accessories:
Many string trimmers allows the hub of the head or the lower shaft and parts replacement. Common accessories include:

Replace the blade with a metal or plastic monofilament thread.
Replace it with a small chain saw to create a shaft power pole saw.
Replace the lower shaft with a hedge trimmer.
Replace the lower shaft and practice.
Quick-release axle offers many new models in the switch does not require any tool accessories.


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The design of a string trimmer Part 2

For inclined or vertical cutting machine can cut some adjustments to allow head at different angles. Vertical cutting is not recommended near the edge of the sidewalk or other concrete pavement, because it leaves open slot, collecting water and cause damage.

Having an internal combustion engine equipped with trimmer cutting head from said opposite end of the shaft of the engine, and an electric trimmer cutting head generally has a motor, but there are also a number of other arrangements. One such is the regulator which is connected to the use of heavy machinery and power of the hydraulic motor arrangement.

Safety shield and rotating wheel head contains the user side of the hub which may also be referred to as a head or spool. Disadvantages of gasoline powered line trimmer including its greater weight and the entire apparatus carries significant vibration, both will interfere, operability, and contribute to muscle fatigue, and it is added to the oil fuel requirements (if it is equipped with two-stroke engines). Advantages include a gasoline-powered trimmers mobility (because they are not connected to a power outlet) and higher maximum power.

A large area of ​​grass trimmer big for cutting roadside, often heavy enough to require two hands to operate, and some even come with a trunk so that users have to bear a certain weight. These very large trimmer commonly referred cutters. Brush cutter type can usually be connected by a metal blade, instead of "string" (or monofilament). Metal cutting blade supports heavy woody brush.

With nylon or metal blade trimmer handle rotation shaft generally require heavy straight disks required higher torque, since the transfer from the blade and back to the drive shaft and the gearbox (ES) impact loads. Smaller cut line shaft bend, holding the cutting head on the ground more easily and with less pressure on operators.


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The design of a string trimmer Part 1

A string trimmer works by centrifugal force is turned on in this line is not fast enough to keep the shell from its (rotary) principle is very stiff. Facts have proved that the line tougher and faster. Even round section nylon line capable of cutting grass and mild, woody plants quite good. Designed for a more powerful tool. Some have a single thread extruded shape, like a star, helping the bank to cut the material being cut; this line it is possible to reduce a large woody plant (shrub), or at least very effective annular tree skin them. These lines make the disk painstaking work less necessary.

The production line is hand wrapped around a reel before the job starts, so that the two ends extending from the reel housing. Reel motor rotation, although operators swing where the plants are trimmed trimmer line extending horizontally. Operators control the cleavage occurs, and can be easily trimmed ground level height. As lines are worn or broken, the operator on the ground, knocking the reel so that the release mechanism allows to extend the number of line on the spool and replace the waste unit. Newer models have "Auto Input" operation in which the line, guard small cutter to ensure exposure does not exceed the length of the cutting line can effectively swing through the motor length. The new line extension to operate more efficiently, because of its heavy weight and surface effects. Spinning speed is usually the hub via a trigger on the handle to control.



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Install carbon brush application of electric

Electric power tools are generally series motor,carbon Brush in which is a consumable accessories.It became a big key to install correctly.Brush installation should pay attention to the following matters:

 

1.Prohibit the installation of different brands and different materials in the same brushless motor.

2.Special attention when installing the spring under the pressure is good, whether or hinder the use of brushes.

3.Note that copper fixing bolts are fixed securely and whether the manner interfere with the use of brushes.

4.Can not have oil, grease gets on the friction surface carbon brushes and rotating parts.

 

Matters instructions before use:

1.Brush the run(CW)

Brush friction surface in contact with the rotating member to the friction surface completely.The transmission will be uniform current.Failure to carry out the work of the run, there will be a spark generated when the motor is running.

Running the following ways:

1)Natural Running:

After installing the carbon brush,So that the natural run-in (different scenarios about 0.5-3 hours, depending on size)

 

2)Artificial Running:

In the case of motor power to sandpaper the run work.

 

3)Running Tools:

In Moshi maintenance tools in the start the motor running at no load running-case work, you need professional before implementation.

 

2.Removing the carbon film(FW)

Brush rotating member in frictional contact and current conduction,there will be action from electrolysis,generating carbon film,there produce carbon film of the effect is good.Generating carbon-free film will quickly wear carbon brushes, rotating parts and wear phenomena.But in places with high humidity make the carbon film is too thick,Easily lead to short-circuit the rotating member, noise, sparks, etc.,So too thick carbon film should be removed.Another situation is changed when new material brushes, due to the material composition and resistance of different carbon film makes the new material with the rotating member of the old material generated by the current transmission uneven and incomplete,easily lead to sparks, noise, wear, and so quickly.Therefore, when the device is new material brush, old carbon film should be removed.

Removing the carbon film in the following manner:

1)Artificial stripping:

In case of power failure with fine sandpaper (# 1800-2500) or fine steel wire cloth rubbed off the old carbon film.

2)Tools to film

Start the motor running at no load conditions to the grindstone and other maintenance tools to film work, we need the professionals before implementation.

3.Brush installation work be sure to carefully.

Inspection work is necessary.

When you purchase the brushes will be accompanied by easy installation checklist for you to use.

 

Brush  installation process:

1)Natural run-mode installation process:

Confirm power--Remove the old carbon brushes--Remove the old carbon film (replacement of brushes of different materials required for this operation or carbide film is too thick)--Clean the motor inside--Install the new brushes--Check the installation--Natural run-in (about 0.5-3 hours, depending on the size of the different situations)--Check the installation--complete

 

2)Tools Running mode installation process

Confirm power--Remove the old carbon brushes--Install the new brushes--Check the installation--De films (replacement of brushes of different materials required for this operation or carbide film is too thick) and run-work--Check the installation--complete