1) I'm using SheetCAM to generate G-code for my mill. I've just gotten the Z axis CNC'd, so I'm learning how to program in 3D now. SheetCAM supports ramping, but I'm not real clear on when this is advantageous, as opposed to just plunging in Z, then moving in X/Y. Ramping is kinda fun to watch, but slows things down quite a bit.
So, when/where/why should I ramp.
2) When drilling aluminum (6061), I usually end up with huge masses of "strings" wrapped around the bit. How do I prevent this? I'm generally "pecking" 1/8-1/4", but even that is enough to generate a huge quantity of "aluminum wool".
3) When cutting, for example, the perimeter of a part, I usually end up with a small "divot" in the profile at the start/end point, even when I arc in and out. I do have a small amount of backlash (under 0.001"), but this seems like more than that. How can I avoid this? Am I not doing the best kind of entry/exit?
Regards,
Ray L.