Hello,

THANK YOU for all of You.

Problem is not resolved ... :(

Yesterday i tried with LinuxCNC live DVD . 2.7.

It is easy to try but the problem is the same !

I moved only one ( Y ) axe because I want to fix the problem.

I moved only in one direction .... from Y = 0 to Y = 600 ....

When I moved Y ... after 200 mm ...300 mm I am receiving that motor knock ...

In Linuxcnc - the same situation ... I tried many configurations .... for STEP pulses, driver setup ( I mean microstepping modes ... )

A little bit better on slow speeds ..... and 400 steps per / rev .... but that is not good idea ..

I have to check LPT voltage .. Also will try to drive the drivers by arduino .. to change speed and to prove driver quality ...

Any ideas are welcome ....

Thank you in advance,

Emil