Originally Posted by
bucketbot
...The TiB2 coating is supposed to work up to 1500°F. I don't know yet what temp I am reaching.....
Aluminum melts around 1200F so I doubt you are at 1500.
You do need some form of lubrication/cooling/chip removal. Misting is a good approach but at those speeds you are going to create a lot of aerosol which is not good for breathing.
This is one application where a cold air nozzle might be worthwhile to get good cooling. If you can keep the temperature down the TiB2 (theoretically) will prevent aluminum adhesion to the tool.
An open mind is a virtue...so long as all the common sense has not leaked out.