The following steps can be used to set the tool in the machining center:

1. Preparation: Make sure the machining center has completed the machine startup, preheating and any related safety checks. Also prepare the appropriate tool.

2. Select reference point: Select an appropriate reference point, which will serve as the alignment reference between the tool and the workpiece. Usually, the machining center will provide some reference point options for selection, such as machine tool origin, workpiece origin, mechanical fixed point, etc.

3. Install the tool: According to the processing requirements, select the appropriate tool and install it on the tool holder. Make sure the tool is clamped correctly and tightened.

4. Set the workpiece: Fix the workpiece with the predetermined processing program on the workbench and ensure that the workpiece is firmly fixed.

5. Positioning the tool: Move the tool to the selected reference point by operating the CNC system of the machining center and record the coordinate value of the alignment point. The manual mode of the machining center can be used to align the tool using the manual operating device.

6. Measure tool length: Use a tool measuring instrument or height gauge to measure the length of the tool at the reference point. Based on the measurement results, compensate for the tool length to ensure the precision and accuracy of the processing.

7. Tool calibration: Use the CNC system of the machining center to adjust the position of the tool so that the tool tip coincides with the reference point. Ensure the accuracy of tool calibration by adjusting the tool coordinate value or workpiece coordinate system.

8. Confirm tool setting: After tool setting is completed, some simple test cuts or dry runs can be performed to verify whether the tool position and alignment are correct. If any problems are found, fine adjustments can be made.

Note: During the tool setting process, be sure to follow the relevant operating procedures and strictly follow the safety operating requirements. If you are not familiar with the tool setting operation or encounter difficulties, it is recommended that you consult the operating manual of the machining center or ask a professional for help.