The zero point is where the burrs first touch. It is your reference for every grind setting.
Video:
(rezeroing starts around 17:30)
Tools: 2.5mm screwdriver. Time: 5 to 10 minutes.
When to rezero
After removing the front assembly for cleaning, after a burr swap, and once new burrs have seasoned. You do not need to rezero just to switch brew methods.
Steps
- Remove the wood accent piece from the front assembly. If it will not come out, see Troubleshooting: Stuck Wood Accent Piece on the Z1.
- With the grinder off, rotate the adjustment knob clockwise until the burrs touch and you feel natural resistance. Loosen it ½ to 1 full turn counterclockwise, then turn the grinder ON.
- Slowly tighten the knob until you hear the first burr "chirp," then immediately turn the grinder OFF. Running with the burrs touching can damage them.
- Hold the knob with one hand and loosen the center screw 1 to 2 full turns with the 2.5mm screwdriver. Do not remove it. If the screw will not turn, see Troubleshooting: Stuck or Stripped Zero Point Screw on the Z1.
- The micron dial now moves freely. Set it to 0 while holding the knob still.
- Tighten the center screw until snug. Do not overtighten.
- Replace the wood accent piece.
- Loosen the knob ½ to 1 full turn counterclockwise, set your grind size, and turn the grinder ON.
True chirp versus false chirp
True chirp is a sharp metal-on-metal sound. A softer rubbing sound with a stiff dial above where zero should be is usually compacted coffee. See Troubleshooting: False Chirp and Zero Point Shift on the Z1.
Dial feels stiff over time
Usually compacted grounds (see the false chirp article). Please do not clean the grease out of the adjustment mechanism; it is designed to run lubricated.