Machining without rigidity is a Hard Problem. If someone expects to just iterate past it or trade away a bit of performance and ignore it, they are in for serio

Machining without rigidity is a Hard Problem. If someone expects to just iterate past it or trade away a bit of performance and ignore it, they are in for serious disappointment. This isn't necessarily obvious to people without CNC experience: just look at the number of people in this thread who think deflection compensation can solve rigidity problems. There's no shame in being new to CNC and not really understanding or believing the hype about rigidity, but the Polar Bear company has a financial interest in pushing people towards learning these lessons in an expensive & time consuming manner. That's exactly what they're doing. The people with CNC experience have seen this show before, have seen the burned customers, and are just trying to make sure that expectations stay in the ballpark of reality.