Jazz,

At last a man after my own heart. All this 10,000mm / sec is just dick slapping. Think about it your part is programmed to run at say 600mm / min the only time this high speed comes into effect is on rapid moves and unless you are belting 4 holes into the corner of an 8 x 4 board any long rapids usually means you are not cutting / programming efficiently.

Even when you ar look at the sceen and see if the actual speed ever gets close to what's' allowed for rapids given that it has to accelerate to speed then slow.
Most time it never gets close to max rapid given the short distance it has to travel.

All insane rapids do is wear a machine out, put undue stress on parts probably not capable of handling them and more chances of loosing steps.

I say dick slapping because a beginners reads all this on here, CNCZone etc and thinks that's what he has to do, most are on small machines that can never, ever reach these speeds and even if they get close how fast can someone get to an Estop ?

When we were first doing the X3 CNC conversions we tried to see what the max they would run at before loosing steps and it was nearly 5 1/2m /min.
We then dropped this back to 4 m/min but it was still scary on such a small machine so finished up at 2m /min.

As a test the machines were sent out with a Sieg Logo badge so the punter could engrave a plate to cover the defunct Z axis handwheel hole as a first job.
There was 4 seconds difference in running at 4m /min and 2m /min