Creating gears on a 3-axis CNC milling machine involves a series of steps. Here's a simplified overview:

1. **Design the Gear:**
Use CAD (Computer-Aided Design) software to create a detailed drawing of your gear. Specify the number of teeth, pitch diameter, pressure angle, and other relevant parameters.

2. **Generate Toolpaths:**
Use CAM (Computer-Aided Manufacturing) software to generate toolpaths based on your gear design. This involves selecting the appropriate milling tools and defining the cutting paths for each tool.

3. **Material Setup:**
Secure your raw material (metal, plastic, etc.) onto the CNC milling machine's worktable. Ensure it's properly aligned and fixed in place.

4. **Tool Setup:**
Install the required cutting tools into the CNC milling machine's spindle. Make sure the tools are properly secured.

5. **Zero Reference Point:**
Establish the zero reference point for your CNC machine. This point serves as the origin for your machining operations. It's typically set at the corner of the workpiece.

6. **Run a Test Program:**
Before milling the actual gear, run a test program to check for any errors or issues. This helps ensure that your setup is correct.

7. **Start CNC Milling:**
Load the CNC program that contains the toolpaths for your gear. The machine will then start cutting the gear based on the specified design.

8. **Monitor the Process:**
Keep an eye on the milling process to ensure everything is running smoothly. Make any necessary adjustments if issues arise.

9. **Quality Check:**
Once the milling is complete, inspect the finished gear for accuracy and quality. Check dimensions, tooth profiles, and other critical features.

10. **Post-Processing:**
Depending on your requirements, you may need to perform additional processes such as deburring, heat treatment, or surface finishing on the milled gear.

Remember, these steps provide a general guideline, and the specifics may vary based on the CNC machine, software, and materials you are using. Always refer to the documentation provided with your CNC equipment and software for detailed instructions.
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