Bob La Londe wrote:

Ok, here we go again. The cabinet for Metal Nibblers One is complete, and I
am ready to add coolant. (Ok, I still have not made a door for it. I've
got sheet plastic spring clamped across the front.)

I've got misc accumulated hardware (pump, locline, barbs, hose) and can make
other stuff as needed.

I favor flood cooling. Mist cooling scares me for most coolants, and I
can't use water based coolants. I'm turning up to 30,000 rpm with an open
brush motor. There is a lot of air moving just from the spindle motor, and
there is a potential for sparks if a mist gets drawn into the motor. The
machine is mostly made of aluminum with some steel parts. Makes water based
a no go.


snipped


I am really pushing my speed for a small machine, and may go faster. For
small circular pockets it can really shake the work bench. I bolted it
through the cabinet through the table surface, and added full length sheets
of plywood to the sides and back to brace the table for those types of cuts.
I may have to make a different more rigid work bench for it eventually. The
plywood on the sides did make a nice place to add heavy drawer slides
though. No I have a place for all those bits, mills, and tools that I only
use on that machine. LOL.

The answer to your issue is air, not liquid. Your best option is to buy
or build a vortex tube cooler and use chilled compressed air for cooling
and chip evacuation. Ideally have a vacuum nozzle located opposite the
air nozzle so that the chips are blown into the vacuum and have less
chance of getting into your spindle motor.