Hi everyone!

I've been driving my self nuts of late trying to fix this problem, so I thought id ask here for help please.

Ill try and put in all the info, to frame the problem correctly..

I'm a home CNC enthusiast, I like to just make stuff

CNC wood router
Old PC (HP) died of old age so got a new PC - HP medium format running Icore5 Windows 7 32bit - DB25 coming off the motherboard pins (checked voltage 3.4vdc) Fresh installation.
Gecko Drive G540 (just serviced as I thought it was at fault)

Mach3 loaded and running sweet, until randomly the machine sometimes it just does a slow x,y,z plunge which i cant stop from Mach3, I have to press the off button on the CNC Machine. This has happened whilst doing nothing or worse it's happened during a project which ruined it.

I ran the same code 6 times and it happened once (6th time) the only difference was I'm pretty sure it happened while i was going between tabs on Mach3.

I found that I could replicate the fault on demand which is a break through really, If I have everything on, M3 running and click file Entib or Merlino the machine will do a slow x,y,x dive that i can only stop by killing power to the machine.

I can also make it happen sometimes by opening another program while M3 is running at idle (autocad)

I dont think its M3 I think it might be something with the PC.

Sometimes when every thing is just sitting there doing nothing, the machine will shudder and sometimes start an x,y,z dive, while doing nothing at all, while diving the DRO dont show any movement, if i unplug the DB25 it still moves....


No idea what to do next, was hoping with lock down to get back into this.

Would be grateful for any help, happy to set up teamview session if needed.

Thanks in advance
Darian