2.2kw spindle Heating Up

[EddyCurrent]

There's also a startup regime to protect the bearings, for my spindle this is;

4 minutes at 25% max speed
3 minutes at 50% max speed
3 minutes at 75% max speed
2 minutes at max speed
until the spindle reaches 35 deg.C

This is not a Chinese water cooled spindle it's an air cooled Italian spindle but as it's to do with the bearings it should apply to all spindles that run above 3000 rpm (so the manual says)

The routine shoild be carried out each time you start it up at the beginning of the day or if it cools to room temperature.
I wrote some simple G code and called it 'spindle_warmup', it goes through the routine above.

[Neale]

I found that I could run my 2.2kW spindle uncooled at about half-speed and light cuts for about 15-20 mins before it became hot enough that I was unhappy to continue - at that point it was still just cool enough to touch but probably somewhat warmer inside. I use a cheap caravan water pump that cost about £12 from eBay (and I'm sure that everyone else can buy them for less - story of my life...) and with a few metres of plastic pipe and a bucket, it makes a very effective cooling system. The pump instructions say do not run for more then 15mins continuously; because my control box includes an old PC power supply I have both 5V and 12V available. I fitted a two-way centre-off switch so that I can give a quick blast of 12V to purge odd air bubbles, and then go to 5V and it seems to be happy to run for hours like that.

[JAZZCNC]

My spindle will happily run for over an hour before getting slightly above luke warm and thats cutting not just spinning. That said I don't run it without water but in the past I have had too when the pumps broke etc so if yours is getting hot then somethings definately wrong.? If it's getting above warm in just a few minutes then I suggest something is wrong. Check the VFD settings to make sure the Amps or volts are correct.