How to Use the Z-Probe (Auto Tool Zero) – Step-by-Step Guide

Using the Z-Probe (Auto Tool Zero Device)

When machining flat plate materials, the Z-probe (also called an auto tool zero device or touch plate) helps you perform Z-axis tool setting quickly and conveniently. However, you must strictly follow the operating steps below; otherwise, the probe or the cutting tool may be damaged.

Step-by-Step Instructions

1. Insert the Z-probe and measure its thickness.
   Plug in the Z-probe cable. Measure the actual thickness of the touch plate using a caliper, and enter that thickness value into MACH3 (in the appropriate settings field).
2. Test the Z-probe (perform this test every time before actual use).
   Turn on the POWER switch. Clear the X, Y, and Z axes to zero. Click the "Auto Tool Zero" button in the software interface. The Z-axis will slowly move downward. Briefly touch the metal clip to the surface of the touch plate — the Z-axis should stop moving down and then rise by 10 mm. This confirms the probe is working correctly.
   Note: Always run this test before each formal tool setting session.
3. Perform the actual tool setting.
   Move the X and Y axes so that the tool is positioned directly above the workpiece origin. Clear the X, Y, and Z axes to zero. Place the Z-probe under the tool and clamp the metal clip onto the tool. Click the "Auto Tool Zero" button. Observe carefully: when the tool tip touches the surface of the touch plate, the Z-axis stops moving downward and then rises by 10 mm. Tool setting is now complete. Remove the Z-probe.

Troubleshooting

If your Z-probe does not function properly, carefully review and re-check Parts 10 and 11 of the MACH3 Installation and Setup Instructions document. Common issues include incorrect wiring, wrong pin assignments, or improper signal levels.