Chinese 2.2kW spindle - wow & flutter

[Boyan Silyavski]

-the power supply /12VDC typically min 300ma/ for the spindle 0-10v, must be separate , do not just take that voltage from somewhere else

-change the trimmer on the output of the board, the one that regulates the 0-10v, or even upgrade it with proper potenciometer

-no need for additional caps if all is working fine. reset back VFD to what it was originally and first do what i suggest above


At the end of the day a crappy BOB does that, i have seen it. So change BOB, or add additional spindle speed controller board /30-40$/

Ahhh, and dont run the spindle at 24k rpm. Or you will shorten its life considerably. In fact never run it more than 18k rpm. And then first run it for a couple of hours at slow speed so grease and bearing sets.

[Jonathan]

Depending on how you're measuring things, the difference between the electrical frequency and the spindle speed (called slip) could come into play, especially at low speeds. But if the discrepancy is there at no load, it's not that.

These spindles are high speed only and should not be run at less than 8k minimum.

Are you not getting mixed up with the air cooled version, which has the minimum speed requirement to ensure sufficient cooling?

If Doddy has a water cooled one, he can run it at lower speeds, just don't expect it be be particularly useful, due to the correspondingly low power.

Ahhh, and dont run the spindle at 24k rpm. Or you will shorten its life considerably. In fact never run it more than 18k rpm. And then first run it for a couple of hours at slow speed so grease and bearing sets.

I don't regularly run mine at 24k, but I have done a few things which have involved running it at 24k for a few hours and in one case ~20 hours. It's 5 years old now and still OK, so I wouldn't worry for occasional use. You can check the bearing spec...

[Boyan Silyavski]

I don't regularly run mine at 24k, but I have done a few things which have involved running it at 24k for a few hours and in one case ~20 hours. It's 5 years old now and still OK, so I wouldn't worry for occasional use. You can check the bearing spec...

Its a personal decision. I don't see why sb will ever need at home to run it at 24k.

[JAZZCNC]

Its a personal decision. I don't see why sb will ever need at home to run it at 24k.

Don't talk daft there are many many times when using small tools you'll need to run at 24k and even higher if possible.

[Davek0974]

I certainly intend running mine at 24k, its sold as a 24k spindle, my speeds and feeds calcs repeatedly ask for far higher rpm's sometimes up into the 40k's so 24k is pretty mediocre i think.

[Doddy]

Yes it's water cooled. My smallest end-mill is 0.2mm dia carbide - yes I'll be at 24k for some things. But not always. Other work would almost certainly be ali., and my test cut was at 10k rpm for an 8mm end-mill.


Now, if only I could get rid of the oscillation on the spindle speed!

Boyan has some reasonably good advice re. PSU, though I'll have to dig out the control box again (behind the compressor, hands-and-knees job) to check out the supply situation - I thought the BOB was on a separate supply.

If the 485 adapter pops through the door before I get to fall to hands-and-knees then I'm tempted with that as a solution (assuming I can get it to work) - the spindle controller is necessarily (physical size, as well as cooling) separate from the control box - removing the analogue side of things is no bad idea.

[John S]

If Doddy has a water cooled one, he can run it at lower speeds, just don't expect it be be particularly useful, due to the correspondingly low power.


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You have answered your own question.