Hey guys: I have my C-Beam Machine up and running, and have done a few test cuts in plywood. All seems to be well. My question relates to cutting bits. I have been looking around, and found several options for bits. I guess the main questions are: 1. Carbide or HSS? I have found some evidence that HSS is actually better for aluminum than carbide. Not sure why, since commercial CNC tooling is generally carbide. Also, carbide is recommended for wood and plastic. Opinions? 2. Spiral Up Cut, Spiral Down Cut, or straight cutter? I tend to use spiral down cut bits for wood, because they don't splinter the surface by tearing up wood fibers. My guess would be up cut for aluminum, to clear the chips better... 3. One flute? 2? 4? Which is the best for cutting aluminum? Why? 4. Anyone have experience with the Chinese CNC bits available on Amazon and Ebay? They are certainly cheap, I have seen 10 pcs. for well under $20, but are they just crap? 5. Anyone have experience using the 1/8" spiral bits made for RotoZip and other tools of this type? They are available in spiral up and spiral down cuts. I don't know if they have the right cutting face to do plunge cuts into aluminum, they are mainly used to cut sideways against the flutes. Again, these are cheap, I saw some in a store today for $13 for 10 pcs. 6. The g-code file that came with the c-beam software seems to use a 2mm cutter. Where do you get these, and where do you get the collet adapter to fit them? I would think these would be pretty fragile... Thanks guys.