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peterg1000 schrieb: Hi Joe,
Welcome to the club from the UK.
You mention that you are mid build on your 840 - if you are not too far forward, might I suggest that you run a couple of extra ground wires alongside the stepper wiring so as to connect solidly to the X and Y axis metalwork. Connect these back to the 0 volts of the power supply on the electronics board.
There have been various forum reports of possible static effects causing difficulties in the past, and there is no guaranteed path to ground from either of these assemblies ( powder coating and hard anodising of guide rails). I think someone even reported getting electric shocks from their machine - not good for fragile modern electronics!!!!
Also connect the O volts to the internal metalwork - the attached picture shows how I did it. I wasn't aware of possible static problems when I built my machine, so properly grounding X and Y hasn't been done yet. Pleasures to come threading wires through X and Z cable trunking!!
When it comes to tuning, be cautious about over tightening the adjustments on the moving rollers - my experience was that following the +1/4 turn suggested in the build manual is far too much. My machine Y axis virtually locked solid with the suggested preload. I slackened everything off and then tightened each very carefully until no relative movement could be felt between roller and the guide rail when the assembly was rocked. The kinematic design in this area could definitely be improved - potentially 16 points of contact on the Y axis is not ideal.
Time spent "tuning" will be well repaid later on - in fact I did a complete mechanical assembly and initial tune before getting into the wiring.
As far as grounding is concerned, on my machine there is continuity between the mains 240V/30V power unit connector ground pin, machine Y axis metalwork though to the USB connector on the laptop computer (I'm using the UC100 + UCCNC combination) and then to the ground pin of the laptop supply. Yes it is a ground loop, but operationally everything has been solid with no unexpected events over the last year of operation
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