This topic contains 2 replies, has 2 voices, and was last updated by 
Omega64 5 months, 1 week ago.
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Hello,
sorry for the poor quality of the video, that I quickly made with my phone. The sound is well representative of the problem though.
Is it normal? I doubt.
Surely all that play/lash doesn’t promise high precision, especially when a future hypothetical CNC miller head will be installed (one of the many marketing promises that now I see like a mirage).
Could you please grab your right (mine does the same also on the left anyway) Z axis and push it up and down to see if it moves like mine? The Y axis for example is perfectly firm, without any lash. The Z ones look pretty ugly instead. Is this “normal” or it is just another free problem that I got in my brand-new-out-of-the-box-was-supposed-to-be-shipped-well-tested Robox?
Thank you very much.
@omega64 sorry for not responding earlier - I, kind of, put Robox in a corner so I calm down a bit and decide what to do next while, like you, waiting for support ticket…
Anyway it seems that what you see is quite normal. There’s a spring at the back (red circle) which allows it.
Thank you Clicky, at least you are replying.
I leveled the gantry manually (as doing it automatically will give much worse results) and measured actual, real Z from the aluminium bed (with PEI removed, as it’s warped).
It’s not linear, for example given Y75 fixed, @X30 Z is found @ 1.9mm, @X111 Z is found @1.8mm, but @X190 Z is found @ 2.3mm
What could be the cause? Clearly the gantry cannot be leveled in any way, neither manually, as the relationship is not linear. I.e. if I leveled to have Z equal @X30 and @X190, then it would be way off @X111 anyway (which is even worse). I shall repeat and stress that this is without the PEI.. so either the aluminium bed is warped too, or it’s the horizontal rails that are bent.
Perhaps, I say perhaps, the Z axis got damaged during a banal homing operation: try to raise the Head all up to 100mm’s and then Home it, and you’ll see hell. I’m not the only one who has discovered this horrible bug (although the Robox even has a Z+ switch which could be used to prevent it!), read here for example.
It happened two times, the 2nd one the left Z axis got even stuck and instead of being horizontal, the Z axis went diagonal , for say 10 degrees, not nice to see at all. However even after removal of the side covers I cannot see any damage, besides the lash but you said that it’s by design (how can this guarantee 20 microns resolution is beyond my imagination though, as also backlash is present).With kind regards,
Fabio Bizzetti - Omega64
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