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Calibration establishes a repeatable reference for your grinder’s adjustment scale. It is different from dialling in a new coffee. Procedures vary by model: follow the manufacturer’s instructions rather than seeking burr contact by trial and error.
Zero point is a mechanical reference used by some grinders, often related to burr contact. It is not a setting for grinding coffee. Different grinders define and mark this reference differently.
Cleaning, burr removal or replacement can alter the reference. A different grind setting for a new bag does not by itself mean calibration is wrong. Bean and roast differences also change how a coffee grinds.
Use the procedure for your exact grinder. Do not tighten the burrs together while the motor runs unless the manufacturer explicitly instructs this. Never force the adjustment or defeat an interlock.
Conical burrs are not exempt from contact damage. Some models calibrate while switched off; others use a different reference. Disconnect power before removing parts, and consult the manual before changing internal adjustment components.
Recalibrate when your manual calls for it, commonly after approved burr maintenance. Return to a brewing setting before grinding. Do not seek burr contact with every new bag; dial in by taste instead.
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