Wow, very fast answer, and probabely right. No VFD, but this could 
correspond to the moment the air compressor that powers the glue pump 
starts.

Shame on me, I read "emi" on the kernel message, but this not printed 
anything in my mind... tired I guess :/



Kirk Wallace wrote:
> On Thu, 2010-08-05 at 17:15 +0200, yann jautard wrote:
> ... snip
>   
>> Aug  5 16:47:37 robot kernel: [24937.315306] hub 2-0:1.0: port 2 
>> disabled by hub (EMI?), re-enabling...
>>     
> ... snip
>
> My wild guess is that the above "EMI" means electro-magnet interference
> which might suggest that you check for electrical noise or a marginal
> connection. Do you have a VFD for your spindle, switcher power
> supply(ies), other?
>   

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