Nice looking machine you've got there....Well half of it at least.
Seems a lot sturdier in the gantry than my X6, it's really good that at least one manufacturer takes some of the wishes of the buyers to heart.
Speaking of the electronic box.
I totally redid my box, see the big X6-1500GT thread,
Posted that last week.
On the note of grounding:
I work at a big petrochemical plant, so I spoke to the electricians about grounding of VFD:s.
What they says, and all the manuals I've read.
You ground the VFD at both ends, and connect the screen at both ends to.
The screen has different purposes for different applications.
In the case of a VFD you want to keep the crap in the cable, manly because you get a lot of it from the drive and motor.
So this is not to disturb other cables and electronics by induction.
Connecting the screen to only one end is done to keep things out, if you connect both ends here it can act as an antenna and create ground loops.
I changed my spindle cables to Ölflex 4x0.75mm2, and connected both ends to ground.
By doing that I ground my machine through the spindle, which raises the safety.
Connected the spindle cable ground wire and screen to the E on the VFD, the feed cable going back to my central ground rail.
I also opted to remove the connector in the chassis of the control box, mainly to keep the grounding and screen intact all the way up to the VFD.
That they are saying that the manufacturer is wrong is probably somewhat a way to cover their own behinds.
Sure USB is really a crappy interface when it comes to real time applications, low priority and sensitive to other hardware stealing resources.
RJ45 would be a lot better here.
That being said, since I used a latency checker in my PC to get rid of things that disturbed my USB connection I haven't had a single problem with my connection.
Both before and after the rebuild of my cabinet.
I actually think that my stepper motors got a little less noisy since everything got grounded, although I did not change the cables to them.
Well those are my opinions at least.
/Patrik