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« on: July 20, 2011, 09:58:32 AM »
The combination of Kernel speed and steps per unit will determine the max velocity you can theoretically achieve.
The kernel sets the max pulserate for each axis so at 25KHz that is the max that Mach will put out per axis. If you have 1638.4 steps per unit then you could achieve max Velocity of 25,000/1638.4 = 15.26mm/second so 915.53mm/min.
Increase the Kernel to 45KHz will give you a max theoretical Vel of 45,000/1638.4 = 27.46mm/s = 1647mm/mim
So as you can see it is the relation of the kernel speed to your steps per unit that will determine the max Velocity you will achieve.
Setting to 45KHz should not be a problem for most computers and some can reliably run at the max 100KHz but it is best not to set it higher than you actually need.
If you need even more, for example I need 666KHz for one machine then you need an external pulsing device, I use the SmoothStepper, it can pulse up to 4MHz
Hood