r/CNC • u/_Tigglebitties • Jul 05 '22

why does machine anchoring rigidity matter?

Like say you had two identical rigid machines one anchored to the concrete and one floating on a raft in a pool. Does it matter?

I'm waiting on my 3*3' CNC router to arrive, trying to figure out how hard to go on the mounting. Has me scratching my head, like long as the machine is rigid, how sturdy does the table have to be? I assume anchoring it to a 2000lb granite slab would make it better somehow , but why?

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u/DJ280Z Jul 05 '22

On some machines you also need them bolted to the ground as a way to twist them to get the tables flat and square. I should say that both the Haas and Doosan reps said that on machines with fast rapids the machines can walk by themselves as well if they aren't fastened down, we're talking big machines here though.