Need help with unexpected/random stops on basic Parport/5 axis BOB setup

Ok, so I'm at the shop now, trying to move forward on this.

Keyboard/mouse : couldn't find a spare USB combo at the moment, and the PC (Dell Optiplex 760) has no PS/2 connections. Tried the next best thing I could think of and unplugged the USB keyboard and mouse after I launched LinuxCNC and got the spindle running idle. Machine stopped after +/- 10 minutes.

Stopped the PC and moved its power supply to a wall socket outside the CNC cabinet, replugged USB keyboard and mouse, restarted everything. I'm now waiting to see if/when it stops running...

One thought : I have added a WLAN card the Optiplex to help set it up, as I had no wired Ethernet available in the office. It's still in the machine. Can this thing create EMI ? Should I deactivate it ?

Thank you for reading me, and for your help
Laurent

Lezard wrote: ......... Can this thing create EMI ?...........

Yes it does a lot, but not powerful enough to cause any issues regarding this.

OK,
So, I also checked the neutral/phase being possibly reversed : it seems OK.

The machine has been running for a while now, with the PC powered from a wall socket outside the CNC cabinet. But again, this is random, so could stop in a few minutes, or in one hour

My friend suggested that the PC should be powered from inside the CNC cabinet, in particular because the Bob gets its 5v power from the PC USB.
I did not understand exactly why, but I trusted his judgment. What would you say ?

Lezard wrote: My friend suggested that the PC should be powered from inside the CNC cabinet, in particular because the Bob gets its 5v power from the PC USB.
I did not understand exactly why, but I trusted his judgment. What would you say ?

I never power a bob from a usb and not from a usb charger either as the smart ones control the charging current with hand shaking

Best to use a small 5V power supply

>Best to use a small 5V power supply

OK, I'll also try this as well. I should have some sort of small standard PSU used for appliances, could this be worth a try before I get a proper one ?

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I need to move now, will continue testing over the week-end and report here. Thank you all for your help )