any ground is sufficient ground. Bare piece of wire leading to an actual grounding-rod is a good example. I suppose the ground to your machine is also a good idea assuming you know for a FACT that it's grounded in the plug all the way to your electical box. It's all the same otherwise. Ground to the system, ground to earth, ground between part and sacrificial metal in the booth. As long as you get something to take stray electron flow away it's fine.
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