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A dashpot is a mechanical device that limits the speed of an object’s movement through friction. It is commonly used on doors to prevent damage and comes in linear and rotating types. Dashpots are essential for controlling accuracy and reducing maintenance costs.
A dashpot is a mechanical device that applies friction to an object in order to limit the speed of its movement. This process is normally accomplished by a spring and some type of internal lubricant applying a resistive pressure that counteracts the force generated by the object as it is set in motion. There is also normally an adjustment present on a dashpot to set the amount of counterforce during operation. The main idea behind installing a dashpot is to prevent the parts from banging together at high speed and causing senseless damage.
One of the more common examples of a dashpot system can be found installed on doors inside homes and businesses around the world. The device allows the door to open without impediments, but once unlocked it will close very slowly thanks to the internal spring which counteracts the natural force of gravity. This type of option is especially popular on doors with fancy glass panels that could crack or shatter if the object is slammed too hard; it is also implemented on relatively inexpensive models to ensure they close properly. To better understand the physics behind a dashpot spring, individuals can try applying force to the door as it is closing to figure out how much resistance the relatively simple device can provide.
There are essentially two types of dashpots commonly available; linear and rotating. The example above describes a linear dashpot as the counter force is applied in a single pre-set direction. This type of system is popular in hundreds of everyday objects ranging from electronics that have external moving parts to shock absorbers installed inside automobiles, such as a carburetor dashboard. Rotating dashpots work a little differently as their resistive motion is in a circular pattern and they are often found inside machinery that needs to spin rapidly. An eddy current damper is another example of a less popular type of dashpot that works with magnetic fields.
Implementing dashpots on modern machinery ensures that accuracy can be controlled even when extreme amounts of force are generated from rapid movements. Without this type of technology, many household and industrial items would require much more frequent maintenance as internal parts unintentionally collide much more frequently. Linear and valved dashpots can be built for relatively little money, but typically provide an effective counterweight that lasts for several years or even decades.
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