Please help - missing steps ... Mach3

[emilvv]

I have no more ideas for my problem ... PLEASE HELP !!!

What I want to eliminate .... When I moving Y axis by JOG ... after 10 - 20 or 30 cm of movement ... and when I hold the stepper motor by hand .. I fill strange, fast, single motor stall for very small period of time . This is as losing steps ..... When add dial indicator to the axe after some movements .... I lose 0.1 mm linear accuracy ... for 1-2 and more hours will be about 5 mm .... maybe

The sound is like a little, fast "knock" ....

What I did to eliminate the problem, noise .. losing steps ...
I tried many combinations

- 2 PC with Mach3 + LPT to the drivers. ( Acer 2 GB, 3 GHz.... Win XP .. ) and Cel 2.4 GHz, 256 MB ... Win XP
- 2 types of drivers - DQ860MA + Purelogic driver PLD8220-G2
- 2 power supplies ...
- 3 types of stepper motors - nema 23 - and 34 x 2...
- long shielded cables .. and short ...ones .
- Ground pipe in earth with cable to all shields .... cases ....
- tried all BIOS LPT modes EPP etc ..
- kernel mode - 25 and one level up KHz
- LPT direct cable to driver and thru BOB PCB card ....

With single G code - Y500 F500 .. after some mm I fill the same issue ...

When unattached motor is on the table ... the problem is the same ...

I have single phase 220 AC voltage ....

If someone have any ideas ... wiring drawings - please send it ... THANK YOU !!

Emil