Losing steps/position, again

[JAZZCNC]

Was at least 5 years ago when I was advised against using the bottom connectors for 5v. Told it's more ideal to modify a usb lead instead due to the protection circuitry.
Trying to re-find information on the net is a pig.

Not sure I'd trust that information. I wouldn't trust USB for a CNC machine, not even to provide 5V as it's notorious for dropping out. The PSU would be protected by it's own circuitry and if the BOB as protection built into the USB connection which isn't on the 5v terminal then I'd take the risk for the sake of £5. I'd rather have it blow up than keep cutting out thru power dropouts while cutting, Only takes one job and you've lost far more than £5.

[dazp1976]

Not sure I'd trust that information. I wouldn't trust USB for a CNC machine, not even to provide 5V as it's notorious for dropping out. The PSU would be protected by it's own circuitry and if the BOB as protection built into the USB connection which isn't on the 5v terminal then I'd take the risk for the sake of £5. I'd rather have it blow up than keep cutting out thru power dropouts while cutting, Only takes one job and you've lost far more than £5.

It's worked so far taking 5v from a small switched psu into a usb cable. However. I might change it round now you've convinced me on it.
If I can make enough money I'll be swapping to an ess and get a new BoB rated for 200+khz asap for axis control anyway. My current board will go to run spindle/ limits/ estop etc. Well that's once I pluck up the courage to tackle the spindle wiring