He certainly seems to be pushing that endmill pretty hard - Not sure my spindle/steppers would be up to that although I think I can push them a lot harder than I currently do.

In the next couple of weeks, I'll find some time to stick a block of 6082-T6 on my machine and play with the cutting parameters - I've done that in the past to land on a set of figures that work okay with plenty of coolant. I think it is time to revisit the experiment with an aim to push my machine harder both with and without coolant.

I'd quite like to experiment with different endmill geometries too (i.e. number of flutes), but I haven't got the cash to be forking out on loads of different endmills right now, so I'm probably stuck testing with 2-flute tools.

Matt.