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How to grind espresso beans 
Identify your grinder. 
These grinders use small, spinning discs to shave apart each bean precisely, which produces a more consistent grind. Any grinder that comes with an espresso machine, or is attached to one, should be a burr grinder.
You can also purchase a burr grinder separately, although it may cost several hundred dollars. Low-speed burr grinders are less likely to burn the beans when grinding it fine for espresso, but may be more expensive than high-speed grinders.