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

[Lee Roberts]

Nice find Hank,

I thought the same as Clive last night, not seen one of them opened up so not sure about the earth...

I have asked Mark and Jonathan to have a look at this thread as i know they have worked with outrunner motors quite abit and as i think that is basically what these spindles are (i could be wrong), could be intrested in buying one as well if you do go ahead Hank bet we could get them down on price if we try !

Let me know.

.Me

[blackburn mark]

The way I see it, the only way the shaft wont be earthed is if they have ceramic bearings and I cant see them having those unless they are the cheaper ceramic coated balls but again, they would be bragging "ceramic bearings" if they did have even those so its a safe bet that they will be fine............. if not you may have to change bearings for some nice cheap ones :)


Edit: just had a though.... if that mount is anodised, that may isolate the earth as aluminium oxide is none conductive (or very poor) so you may have to leapfrog the gaps twixt your motor body and mount
Your mount and Z plate should be fine (via the fixings)
I would guess that those people having problems with the model you mention are suffering this slightly elusive isolator.

[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!)