i forgot ,travell speed 5m/min(200inch/min),cut 0,7m/min. trough 2cm wood like butter, no lost steps.(woodrouter is whith leadscrew and bigger(plasma) is with rack and pinion)
Kelly says:
Step pulses from KCam can sound uneven or lost steps are suspected. Here are some things to reduce this probem:

In the KCam's Table Setup window:
Check the Hide Axis Cursor parameter
Check the Disable Position Update parameter
Check the Limit Switch Disable parameter
Change Application Priority to High
Be sure to use the Ramping feature to avoid lost steps

In MS Windows:
Disable the Local Area Connection (NIC)
Exit all other applications
Disable other applications or 3rd party tools from starting with Windows
Stop unnessary Services in Windows with an easy to use script: www.kellyware.com/anonymous/StopServicesScript.zip

it works much smoother without jerks.