The 2.2Kw Chinese Spindles - Info, Setup and Advice + More

[Jonathan]

This one is cheaper.
As far as I can see it's just luck with the bearings. The sellers on ali-express will discuss them however, so it's possible to get better ones but you do pay for it. I got my spindle from the eBay seller 'solar.jean', which was the cheapest at the time with best offer saving about £20. Turns out it has 4 bearings (H7005C TN1-2RZ and 7002CTYN) and the two big ones are a matched pair with the V markings on the outer rings, so it looks like I got lucky. Bear in mind however that was a couple of years ago, and someone on the forum got one from the same seller a week after me and received a presumably different model as his didn't have any writing on the side.

Power supply: I've got 3 of the generic 2.2kW chionese VFDs and they all work fine. I know plenty of other people who have used them without problems.

Water pump: These spindle are pretty efficient as they're induction motors, so they don't require much water to cool them effectively. The main thing is to get a pump with enough 'head' so that it can lift the water high enough to get up the pipes. A fraction of a litre per minute is probably plenty for most people, especially since the vast majority of things will never draw anywhere near the rated power of the spindle. Your calculation is fine except the assumption of dissipating 2.2kW is not reasonable. The spindle is probably about 95% efficient at full load, so maybe 110W ---> 6.3l/hour for 15° rise. You shouldn't need to spend more than about £20 on a pump, for example:
SUBMERSIBLE WATER PUMP 2200 L/H AQUARIUM FISH TANK POND GARDEN 56W NEW UK AP5100 | eBay

Radiator: I don't have one, just a reasonable size reservoir is enough... so passive cooling.

Cable: CY 4-core cable, 0.75mm^2 or greater. Connect earth wire to spindle body and VFD. Also connect shielding just at VFD end.

Tubing: Just need cheap PVC tubing, 8mm if I recall correctly. Plenty of it on eBay.

Collets: Get a set off eBay in china. They're plenty good enough for these spindles as although the runout with these collets is slightly greater then high quality ones, the spindle runout is greater than the difference so it makes virtually no difference. Make sure the spindle you get is ER20, not anything smaller, otherwise you can't use 1/2" cutters which are common for wood router bits.