How do I dial in my espresso grinder?

Dialing in is the process of calibrating your espresso grinder to the specific characteristics of your coffee beans, your machine, and your personal taste. Because every coffee has a different density, roast level, and age, there is no "set it and forget it" number on the dial. Instead, you are looking for the sweet spot where the resistance provided by the coffee puck matches the pressure of your pump.

To begin, choose a standard recipe, such as an 18-gram dose yielding 36 grams of liquid espresso. Set your burr grinder settings to a range typically used for espresso—fine, with a texture similar to table salt or powdered sugar. Pull your first shot and time it. If the shot rushes out in under 20 seconds, the coffee is likely under-extracted and will taste thin or sour. Adjust your grinder finer to increase resistance.

Conversely, if the shot takes longer than 35 seconds or drips slowly, it is likely over-extracted, resulting in harsh, bitter notes. In this case, adjust your grinder to a coarser setting. Remember to purge a small amount of coffee after each adjustment to clear out the "old" grind size sitting in the chute, ensuring your next shot reflects the new setting accurately.

Consistency is your goal, not just hitting a specific time. Once the shot tastes balanced—meaning it has sweetness, acidity, and a pleasant body—you have successfully dialed in. However, keep in mind that as coffee beans age, they lose moisture and CO2, requiring you to adjust your grind finer over the life of the bag to maintain the same extraction time.

In practice, treat dialing in as a dialogue with your equipment. Make small, incremental adjustments rather than large turns of the dial. By keeping your dose weight constant and only changing the grind size, you isolate the variable and learn exactly how your grinder influences the final extraction. Over time, you will develop an intuitive sense of how different beans behave, making the daily ritual of dialing in faster and more rewarding.