[Adverse Effects]

my unit is

P4 3.0Ghz 2Gb RAM win XP SP# no internet connection so no antivirus needed

china/ebay CNC 6040 + G540 4-Axis Digital Step Drive + all cables replaced with high quality shielded cables + 700Lt p/min pond pump all earth and shielding go back to a central point

[sn0wchyld]

my unit is

P4 3.0Ghz 2Gb RAM win XP SP# no internet connection so no antivirus needed

china/ebay CNC 6040 + G540 4-Axis Digital Step Drive + all cables replaced with high quality shielded cables + 700Lt p/min pond pump all earth and shielding go back to a central point

hey mate

if you're still having issues, and haven't shot the thing yet :devious:... try getting a smooth stepper. it sounds like a mistiming from your computer to me (thoough im new to this too) I was having similar problems of missed steps, that got worse with higher feed rates.

Try also opening a new program or doing something else that will require the computers processing power while running the toolpath in mach3. if you notice more missed steps when doing so, chances are its the computer causing the issues. This is how I figured out that the computer was causing my problems, and installing a ethernet smooth stepper solved 'em completely.

[MarcusWolschon]

I would try HDD access and network load causing interrupts.
The CPU should not be the limiting factor.
(Timing is the reason why I replaced the LPT breakout board with a USB board that does the timing in hardware, getting commands instead of step+dir pulses from MACH3)