Doser Grinders
WHAT IS A DOSER GRINDER?
Doser grinders have a container (aka the doser) that catches the coffee after it is ground. At the bottom of that container is the doser mechanism that portions out the grounds into individual, identically-sized compartments. A flip of a lever dispenses one dose at a time into your container of choice, whether it be an espresso machine portafilter or a drip-machine filter basket.
Additionally, the doser chamber is divided into pie shaped segments that rotate with the pull of a lever to usually deliver around 7 grams of ground coffee. With each rotation a new section will move over the dispenser chute and deliver a pre-measured amount of ground coffee directly into the filter basket. This operation is found in commercial espresso grinders. The advantage of the Doser grinder is that it delivers quick pre-measured dosing which is useful in high volume environments.
Doser coffee grinders are popular in restaurants and cafes for a reason: they lend themselves well to maintaining a consistent product in high-volume venues that pull dozens or hundreds of shots a day.