Have my new SO5 cutting through some aluminum, good clip about 2000mm/min, 1.5 DOC, 20k RPM with a fogbuster (mainly for some deep slotting). Using an Amana .25" single flute Zrn coated cutter.
However, I have noticed some surprising differences in raw material. Locally, I use Caremark Metals for aluminum stock, usually an extruded 60601 T6511 bar that is chopped off at whatever lengths I need. (usually 6x12x1"). This seems to cut very very well. I dare say like butter.
However, they are a bit more expensive than what I find on Amazon, and Amazon ships to my door, so I got some of these.
It is surprising how different the Amazon stuff is to cut. Lots more coolant, have to go slower, not as clean of a cut. From what I read, the tempers are pretty much identical T651 vs T6511, and the extra “1” is to imply it was straightened.
Sometimes I think I am crazy, but I wouldn’t have expected this much of a difference.
Just looking for thoughts on the matter, or what temper is best for machining?