Want To Learn Cnc Before I Get Mill

Have a look at Fusion360. It is full 3D CAD and has CAM built in. It is free to hobby and startups.

As to hand coding your Gcode. For very simple squares and cylinders that is fine. If you are making more complex parts that have thousands of lines of code you need a CAM program and spend the time to learn how to use it. There is a learning curve to CAD, CAM and CNC machining. I'm 67 years old and still learning it.

Dave
 
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