I am finishing up my large (30hp) cnc lahe retrofit and I have a few questions about tunning for the highest possible rapids on the x and z axis with Mach . I am using 2kw, 3 phase brushless AC servo motors and matching drives from Automation Direct. Doing the math with their servo-sizer software my setup should be cabaple of rapids in excess of 1000 IPM . Using the out put signal from another machine with Yaskawa PLC I was able to easily run the x and z axis at a sustained 800 IPM with no problem , motors and drives never got above room temp
I would like to use mach3 with this machine , I have installed the c11 breakout board from cnc4pc and mach 3 , the x axis requires 90k pulse per inch and the z requires 50k pulses per inch . With the kernel speed set at 45k hz the maximum IPM that can be input x axis is 30 and the max for z that can be input is 52 IPM . The software will not allow me to type in a larger value. The machine seems to run fine at these speeds but is painfully slow. If I change the kernel speed to a higher value I can then change the IPM in motor setup to a higher value but when I try to move the machine at anything over aprox 65 IPM the motors run in pulses , pause and then run , stopping and starting at regular intervals. The motors are not stalling , its as if the drives are receiveing the steps in burst with a pause in between.
What do I need to adjust or experiment with to get rapids of at least 400IPM? Could this be an issue with the computer or memory? its a p4 2.6 ghz