[GrizHFMinimill] CNCs (was power feed)

If you want to cut steel, its a whole different ballgame. The rigidity required goes up with depth of cut and with how much acceleration you set the machine to, so you can cut anything if you're willing to make enough passes - but hey, that's why you built a robot to do that. On 6061 aluminum, I usually use a DOC of .050 or so and use a .125 in single flute "O" type cutter made for routing aluminum. As long as making 100s of them isn't a requirement (like on the production machines you mentioned), you can finesse a lot of things.
Happy to answer questions. What voltage is your supply right now?

BTW, I fumbled the shift key before. Its www.liming.org/espcopter
and www.liming.org/orrery

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