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

[asbo]

I have one I'd like to sell, never been used, still in its original packaging.
I just stuck the multimeter on it and there is 100% resistance between the shaft and the body. There is no earth wire, just Red and Black. The top of the shaft has the cooling fan(?) attached to it, but its level and I'm not sure how you'd attach an earth to it. Would you like some photos?

[blackburn mark]

I have one I'd like to sell, never been used, still in its original packaging.
I just stuck the multimeter on it and there is 100% resistance between the shaft and the body. There is no earth wire, just Red and Black. The top of the shaft has the cooling fan(?) attached to it, but its level and I'm not sure how you'd attach an earth to it. Would you like some photos?

that is odd?
I would love to know where the break is... there must be one between the shaft bearing and body and I just cant see it being ceramic bearings?
maybe there is more plastic in there than you would have thought?

[Swarfing]

I have just checked mine and i have continuity between spindle and body. Does that answer the question?

[Clive S]

I have just checked mine and i have continuity between spindle and body. Does that answer the question?

But is this the same type as spindle? ...Clive

[Swarfing]

300W 12V-48V DC High-speed air-cooled Spindle Motor for Engraving Milling | eBay

this is the same type as the one i have.

[asbo]

OK here are some pics of mine.
I've checked again and there is still no continuity between the body and shaft. Although maybe I've lost a few more marbles
There are two screws under the plastic fan thingy on top which presumably would allow it to be disasembled, but I'm not sure you'd get the plastic thingy off without breaking it.
Here is the listing I bought mine from CNC Spindle 300W Motor ER11 collect & Mount bracket Set-in Machine Tool Spindle from Industry & Business on Aliexpress.com

[HankMcSpank]

I've already PM'ed asbo the video, but I'll post it here to so other can have a laugh...



should be ideal for milling 0.5mm pitch pcb packages!

Swarfing - do you use yours? (or have you used it?)

[HankMcSpank]

I have just checked mine and i have continuity between spindle and body. Does that answer the question?

yes & no...it goes to show that there are some Chinese 300W spindles out there that have continuity & others that don't - thanks for checking though!

These ones on ali express (which seems to be a tad cheaper place to buy vs. ebay) all look much of a muchness, this one looks like yours...

http://www.aliexpress.com/item/Free-...666996832.html

another variant (quite similar)...

http://www.aliexpress.com/item/DC-12...677456541.html


Speaking of importing, I'm probably gonna buy this CNC machine (just the machine & steppers only - no drivers, spindle or VFD etc)....

http://www.alibaba.com/product-gs/82..._for_wood.html

....as I prefer a moving table machine (quieter...the moving gantry machines seemed to be designed like an acoustic guitar - i.e. a big 'soundbox' below the table to amplify the vibrations!) & nobody seems to sell moving table CNC machines anywhere in the UK (Premiersigns did have a similar model - one of which fivetide bought - but even they don't show one on their site now). The Chinese supplier is quoting $1000 delivered by sea which is about £650 + taxes, which for a 3020 ballscrew/ballnut machine constructed from Aloominum(!) seems reasonable.

[GEOFFREY]

Hi, I was at premier in Nottingham a month or so ago and saw what I think was a used small fixed gantry hiding in the corner. I think it may have needed some work to get it going, but I would suggest it would be worth a call to Collin (forum member) to see if he wants to sell it. G.

[HankMcSpank]

Thanks I'll follow that up