Chinese 300W DC spindle - is the spindle shaft grounded?

[HankMcSpank]

asbo: PM sent.

The thing is I want a new spindle for PCBs.....my main requirement is actually low noise (I've cordoned off a downstairs room in our house & deemed it "man cave")...I've neighbours to consider & of course my wife will surely get more than a little p1ssed with the sound of a CNC spindle constantly whirring if its too loud....since I'm only milling FR4 & the odd bit of acrylic, a water cooled spindle seems excessive (& just adds a lot of weight to the Z axis)

the zen toolworks spindle is stupidly quiet.



(& in this video it actually sounds a bit louder than it typically does in other videos I've seen with the zen spindle)

Edit: ok, found it - Here's the video that first caught my attention about how ludicruously quiet the Zen spindle is...



(you have to do a double take to actually suss the spindle is on!)