Quote Originally Posted by Jonathan View Post
Don't - you can't use very low speeds with the air cooled ones, otherwise they overheat. They're also going to be much noisier, which will add to the total noise when cutting. Also what's to suggest the bearings in an air cooled one will be any better?
I've never seen a warranty seal on one, but equally I wouldn't recommend dismantling one just for kicks...since knowing which bearings you have doesn't really change how you use it.
Hi Jonathan, well I think there have been changes since the first square ones came out.

I spent the day with a friend and he was cutting most of the day with his square one, it is noisey ill give you that, but not as noisey as i thought it was going to be, as for not being able to cut at lower speeds, his one was an 18000rpm model and he ran that all day at 8500rpm and yes it got hot but nothing to speak of.

As i said, like the round ones, things have come a long way since they came out.

He killed two square ones and a round one in 2011 and he has had this square one since may 2012 so something has changed and its not his supplier, admittedly he dosnt run it 8hrs at a time but 4-5hrs a day is not unusual, I understand that none of these spindles (square or round)runs well at low speeds because the lack of torque at lower speeds is prohibitive, so ive had to make a decision based on what ive seen, if there are round spindles out there in that price bracket (including mount,pump, tank, piping, and inverter of course) that can be seen working then point me to it ill have a look. My friends one has a warranty seal on it, must be the supplier used.
As you say it is a gamble, because its so far away, you could get anything. Ive actually asked for a price with ceramic bearings, on both the square and the round.

Rick