Maybe, but if I understand correctly this is a polisher using diamond tooling, not a saw blade (I can't get the page to come up at present to check that). Most diamond tooling in the stone industry (granite, etc.) runs at 30,000rpm upwards (correct me if I'm wrong stone guys) depending on tool diameter.
Re turbines, yes big ones run at low speed but small ones as in the case of certain turbochargers run regularly at 150k. It all depends on wheel diameter. But hey, all of this talk we're doing here is only supposition as to how they acheived 44k if, as you correctly ask, they in fact did achieve 44k at all. |