The 10 Worst Machine Espresso Failures Of All Time Could Have Been Prevented

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How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to make the coffee we love. How exactly does it work?

In order to make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, but the difference is in the pressure.

The Head of the Group

The group head is the portafilter that you place in the espresso maker when making it. It disperses water into the portafilter, and regulates the pressure of the extraction. There are several different types of group heads, each with their distinct advantages and drawbacks. Some focus on temperature stability, some on pre-infusion options, and others are designed to control the lever. Some include a combination like the E61. This is a popular choice among baristas because it offers multiple benefits in one package.

As you can see in the photo above the group head is made up of several notches where you put your portafilter, then twist it with your hands to secure it. A rubber gasket is located inside the notches, which helps create a seal when you insert your portafilter. The notches permit the precise placement of the portafilter. This is crucial for an accurate extraction.

Apart from allowing you easily insert your portafilter, the group head is also responsible to maintain an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew basin, ensuring that the temperature is constant for extraction. This is important, as even a small difference in temperature can make the difference between a excellent and great espresso.

The Pump

The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This differs from manual piston machines that use a lever. The pressure is built by pumping water through a heat exchanger and then through the ground coffee.

Pumps are generally less expensive and last longer than piston-driven machines. However, both kinds of machines are susceptible to degrading because of frequent use and insufficient cleaning. Pumps are also more complex mechanically, which can increase the cost of even simplest models.

Some espresso machines employ steam pressure instead of a pump to brew espresso. The downside is that the boiler that produces steam also increases the temperature of water until it reaches boiling, which can lead to excessive extraction. They also have to continuously rebuild their pressure between cups. This requires energy and time.

Many espresso machines make use of an rotary or vibrating pump, with a vibrating model that uses a vibrating disc to generate the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both machines produce great espresso however rotary machines tend to be more stable, quieter and less likely to fail.

The Boiler

The boiler is the component that heats water to the optimal temperature to extract. The steam that is produced will eventually reach the portafilter, which is a container for espresso grounds. It is then poured into the cup. The steam causes enough pressure to push the grounds of the coffee through. This results in a layer crema that is then poured over. This is one of the main characteristics of a great espresso.

There are three kinds of espresso makers, which differ in the type of pump they employ and how hot the espresso is. There are many ways to control the brew and the size of the cup that can be made by the machine.

The earliest espresso machines were steam type. The first espresso machines were steam types. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso machine is a semiautomatic that has an electric pump. These are the things people think of when they imagine an espresso machine. If you have a semi-automatic machine you need to grind the beans and then tamp them yourself but the pump controls the flow of water and pressure. This is a great compromise between human control and mechanised consistency.

The Filter

Espresso machines usually have a filter that separates the grounds of the coffee from hot water. The filter is also a vital component of the machine’s temp control, as it prevents overheating.

A filter also improves flavor as it allows for the beans to flower for a longer period of time. This allows the beans to release their flavor and allows for better extraction.

However it is crucial to keep in mind that even a good filter could result in a bad cup of coffee, since the quality of the beans and extraction are essential.

This is where the magic happens, it’s the thing that makes an best home espresso machine – http://arikkeu.com/g5/bbs/board.php?bo_table=arikkeu1234_&wr_id=126491 really taste good. The grouphead (also called the brewhead) is where