Originally Posted by
dmalicky
Sorry for the slow reply. I've not done any optimization for aluminum cutting with it, as the potential is just not there. Our machine chatters even with moderately heavy cuts in hardwood. To see some ballpark capabilities, try searching youtube for "k2cnc aluminum" -- almost everyone is using 1/8" cutters or smaller. One person cuts steel at 0.001" DOC.
I've also looked for an economical and stiff 2x4 machine but there isn't much out there. XZero makes a machine with thick frame members, but still uses 1 bearing per rail. With K2, if you ordered the current "HD" option with 2 bearings per rail, and reinforced the gantry plate and side plates, it should be much better for aluminum. Or DIY.