Quote Originally Posted by Clive S View Post
The motor you linked to is air cooled and very noisy the water cooled one's are very quiet. You will also need a VFD to power it.
The one he linked to is not going to work anyway because his machine is just not made for these large spindles. Also, in regard of noise, I must say I disagree that it matters. I have a similar spindle, and while it may be noisier than a water cooled one, it is MUCH quieter than the one he has at the same RPM. I had a similar DC motor like he has and I know this for fact. Also, once the spindle starts cutting the cutting noise is several times more than the spindle noise. Not to mention the vac... :)

So, air cooled vs. water cooled... water cooled wins by miles when you cut air, but when you use it for cutting it makes no real difference at all.