Hello,
I can't increase the velocity value above 1114.2 mm's per min at  1500 steps per.
Why is that?
But I found a video ( https://youtu.be/e9_ye1-ISjQ?si=2RM-vy9GemApRJIv&t=368 ) where the user increases the velocity to 3000 and then to 5000 mm's per min at 1000 steps for. Why can't I do this?

If your machine, computer, motors & their drivers can handle the increased velocity then increase your Kernel Speed (Config / Ports & Pins). This will enable higher Velocity settings to be entered in Motor Tuning. Mach will need a restart to secure the change.

Tweakie.

Thanks!
But in the video I see 25000Hz. And I use ESS Smoothstepper and the manufacturer recommends not to change the frequency to 25000Hz.
Is it necessary to split the step size?