Arrive on time. It's important that you are on-time for an interview. By doing so, you're showing that you are mindful and respectful of the interviewer's time. Arriving late can negatively impact your chances of landing the job, as it shows a sense of apathy and indifference.
There are two types of lever machines; manual piston and spring piston design. With the manual piston, the operator directly pushes the water through the grounds. In the spring piston design, the operator works to tension a spring, which then delivers the pressure for the espresso (usually 8 to 10 bar; 116 to 145 psi). Steam-driven A steam coffee machine
A normal single cup of espresso is approximately 1 to 1.5 ounces of beverage, using approximately 7grams (1 tablespoon) of ground coffee and brewed over about 25 seconds (25 to 30 seconds). A normal double cup is between 2 and 3 ounces, using double the volume of coffee grounds (the same time - 25 to 30 seconds).