How To Calibrate Coffee Grinder
Coffee grinder should be calibrated the first thing in the morning on a daily basis. If the weather is changing, you have to do it again during the course of the day. If people do not follow this simple step, it results in an inconsistent espresso. Even if you have very good quality coffee beans, fantastic machine, a skilled barista etc. but do not know to calibrate the coffee grinder, it results in an inconsistent coffee brew. The coffee can turn out to be weak, watery, bitter or burned out.
In order to calibrate a coffee grinder, you just need a kitchen timer. You can purchase a kitchen timer with an adhesive back and stick it onto the front panel of the commercial espresso machine. Using this method, you will be able to check the consistency of the grind throughout the day. The optimal time is around 30 seconds to extract a single ounce of espresso. It further requires about 20 seconds for extracting a 2/3 ounce of Ristretto. In case the extractions are calibrated to be faster than this, it is difficult to extract enough flavour of coffee. The coffee in turn will turn out to be weak due to a lack of flavour.
On the other hand, if the extraction happens to take a time duration that is longer than 30 seconds, the resulting coffee will be bitter. For best results, you must grind the coffee to make it coarser. Coffee grinders will absorb moisture from the air. This in turn alters the flavour of the coffee. In order to avoid this, you must empty the chamber of commercial coffee grinder every night. You can load it with fresh coffee beans every other morning. On a humid day, the coffee grinder will absorb water more quickly when compared to a dry day.