I'm cutting 3/4" ac plywood on a prt alpha, and having some difficulty controlling the smoke and burning... as well as breaking bits. I'm running 1/4" Onsurd 2-flute upsiral at 12000 rpms/1.7-2.0 ips and steping down anywhere from .1-.35. Not sure if that information is helpful, or even if I'm using the correct terms, I'm pretty new to this machine, and running a shopbot in general. Has anyone else run into this, and if so, could you offer any solutions?