We've only been able to test it on wood but I was happy with the results! I dropped it off with the customer last night and if he approves, we'll try to re-make a final version out of tool steel!
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Machining AR-15 Lower Receiver: https://www.youtube.com/watch?v=svtIp2wzl1A
DIY Arduino CNC machine with GRBL: https://www.youtube.com/watch?v=1ioctbN9JV8
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