A lawn mower is basically a machine using one or more spinning blades to cut a moving grass surface to a desired height. The height of the finished cut grass can be pre-determined by the style of the mower itself, but in most cases is customizable by the owner, usually by either a master switch or by some simple lever or screw on each of its wheels. The cutting blades are enclosed in a trolley attached to the mower. Some models are mowers that only operate in one direction while others will cut in both directions.
The cutting blades will rotate either clockwise or counterclockwise, depending upon what is needed for the application. There are some blade styles that are designed to aid driving snow or ice, thus rendering the blades less effective in clearing snow from driveways. The blades themselves will rotate in an enclosed assembly with hydraulics and gears at the base of the blade.
Blades of lawn mowers are available in different shapes, sizes and materials. For example, blades of a push lawn tractor are generally made of heavy steel for extra durability and life. Blades of an electric mower on the other hand, are typically made of plastic due to their weight, which is also their weakness. Blades intended for use on soft ground may have an inner layer of epoxy, rubber or plastic to provide traction, while blades intended for hard ground are made of metal with steel teeth for added strength.
Mower wheels come in a variety of shapes as well. Some models of mowers will have a series of slots to keep the blade rotation horizontally, while others are designed with slots that allow the blade to spin horizontally. The wheel spindle is located between the cutting blades, and it rotates at a high speed, usually in excess of 120 rpm. Spindle drive mechanisms are more efficient than belt-driven mechanisms for most applications, though some lawn maintenance companies still prefer belt drive because of its quieter operation.
Lawn mowers are designed to be able to stand up to wear and tear for many years, as well as being able to cut through various types of snow and ice. However, even with regular maintenance, some types of blades will need to be replaced every year or two due to the wear and tear that is normal between seasonal usage. The blades of today are designed to be much sharper and tougher than those blades of decades ago.
Lawn mowers that are powered by electricity run on a 12 volt battery system, which are recharged by plugging into an external outlet. To ensure that the batteries are properly charged, lawn mowers should always be plugged into a power outlet when operating, and the blades should always be properly sharpened before usage. However, in order to keep the blades sharp, they should be sharpened at least once a year. Many electric mowers come with an automatic sharpening feature that allows the user to manually dull the blades as needed. Some mowers come with an adjusting screw that can be used to make the blades of a mower very sharp or very blunt.
Most electric lawn mowers have a cutting plate that holds the grass cutting blade and other smaller tools like weed whackers. This plate is typically made of steel or plastic and is mounted to the lawn mower’s engine, much like a radiator on a car. This plate is subject to chipping and cracking, so it is important to be careful when using it. If the blade should become damaged by a sharp object, a new blade must be purchased or sharpened immediately. Curing the steel or plastic blade in place can cause a problem.
Changing the blades in a lawnmower is quite simple, especially if there is only one sharp blade. Simply remove the old blade and replace it with a new one. It is usually very simple to do and only takes a few moments. Many people like to sharpen their blades manually, but automatic sharpening systems can eliminate this problem because the blade is always being sharpened automatically. Many models are equipped with a second setting that will sharpen the blades without human intervention.
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