Okay...I've spent several days of my life (regretfully) looking through all of the Chinese machine forum and most of the Mach forum and haven't found a solution. I'm sure that the answer is simple. I know this because I finally found the reason Mach 3 wasn't saving the machine coordinates was because the "persistent DRO" check box wasn't checked. Only took me two day to find that. The problem is that my "WONDERFUL" Donja 3040 engraver is supposedly 300mm by 400mm. Mach 3 seems to think it is 30mm by 40mm according to the DROs. I can't get the DROs to show correctly. The soft limits have to be set up as 30 x 40. If I set 300 by 400 then the the X and Y slam into the ends of the axis. I don't even want to try to explain what the Zed does. Anybody have some suggestions (heaven forbid an actual solution) on what I have done wrong to screw up the scaling?