Water cooled chinese spindle collets, Advice from owners please

[JAZZCNC]

Hey guys, I have ordered a chinese cnc 3040 with a 1.5kw spindle.

I am wondering from owners of the watercooled 0.8kw 1.5kw and 2.2kw could tell me if you have ever dismantled one?

The one i bought comes with an ER11 collets, but there seems to be replacement collet system for spindles from ER11 ER16 and ER20 and i am wondering if they are actually interchangeable?

Would anyone be able to supply detailed pictures and if possible show one dismantled and/or confirm they are changeable?

Yes I have striped one and no they wont because of the way the rotor is part of the collet shaft.
The different spindle KW and ER sizes etc make them completely different so therefore not interchangable.

The ER shafts you link to are not replacenments but more extensions and adapters for drilling machines etc or building your own spindle. One of them is MT2 to ER adapter used on mills and lathes.

Here's some pics of a 2.2KW I killed.!!

[Ali Kat]

I can confirm Jazzcnc statement. The chuck is integral with the main motor shaft. I have noth 0.8 kw and 2.2 kw and you just use whatever is on the end.

Hey Jazz, How did you kill that 2.2?

[GMCNC]

Hiya, Will the suppliers not supply you with a larger collet system if you specify it?

[Ali Kat]

As these items are mass produced I would doubt that a special would be considered. Even if it was, I would expect a hefty premium to produce a one off. It's not quite as simple as putting a larger shaft into to smaller motor casing as it simply doesn't fit.

Ali Kat

[JAZZCNC]

Hey Jazz, How did you kill that 2.2?

My own silly fault, I'd had the spindle off a few times to check fit for some mounts I'd made for someone and didn't fasten the cable guide correctly, So over time the connector was bending and snapped wire inside main connector at the spindle causing dead short and great big blue flash.!!!!!. . . . . Killed both spindle and ABB350 VFD stone dead. .

[Ali Kat]

Whoa - expensive smoke!!!! Let me know if you want to part with the dead bits as it may be useful to have a couple of bearing housings on the spares shelf for my own 2.2.

Ali Kat

[JAZZCNC]

Whoa - expensive smoke!!!! Let me know if you want to part with the dead bits as it may be useful to have a couple of bearing housings on the spares shelf for my own 2.2.

Ali Kat

Nope sorry. It's going to be modified to belt drive then used either has a secondery slow running spindle for steel work or be used for the spindle of a mini lathe.?

Just don't ask when.!!

[Ali Kat]

Very good idea Jazz. The spindles seem to be fairly well built and certainly they are mechanically robust. Should make a good spindle with, perhaps, a multi step pulley to give speed variances etc. Put up some pics when it's done as I'm sure that you won't be the only owner to "kill" one of these spindles!

Ali Kat

[Jonathan]

Very good idea Jazz. The spindles seem to be fairly well built and certainly they are mechanically robust.

I wouldn't be so sure. They're well built for high rpm use...

I don't think it would make that good a spindle for a lathe, unless the lathe is very small, since it uses angular contact bearings. Most lathes use tapered roller bearings since their load ratings are much much higher. Angular contact bearings are the only bearings suitable for high speed and axial loads, but you don't need that high a speed on a lathe (unless it's something special) so why compromise the rigidity so much by using the wrong bearing type. Same is probably true for a spindle for cutting steel since again that's low rpm and you need higher rigidity for cutting steel.