Hi Khouj,
Thank you for all your efforts on my behalf. I now have the important information to sucessfully mill aluminium on my 6040Z! You have really sorted out how to mill inexpensively. I've been buying expensive super-duper end mills from Germany (and breaking them by milling too fast) and using aerosol cans of silicon lubricant. A simple router bit and a kerosene+cooking oil lubricant is an excellent replacement. The information you have give in this topic should be made a 'sticky' for noobie CNC users like me. I'll post some photos and videos of my first attempt.
Cheers
Gary