With small CNCs, the easiest way to adjust height (and sometimes the other axes) is to use a probe block. Generally, they’re just aluminum blocks of a known size that the CNC controller sends 5 volts through. Then you connect a ground clip to your spindle bit, and as soon as it touches the probe block the controller sees that electricity is flowing and knows that the tool is touching the probe block. If you know that your block is 15mm thick and sitting exactly on the top of your material, ...
