I suggest you contact maxnc direct at http://maxnc.com/
I've recently acquired an older maxnc 5 mill and have it set up and running with Mach 3.
The machine is calibrated and I have successfully cut many parts using sheetcam to generate the g code.
The maximum velocity on my drives however is roughly 80-100 mm/min before the stepper motors begin to skip and fail to properly rotate.
Is there any way of swapping the motors out for more powerful ones? Does anyone know how much current the stock boards can handle? And what size stepper motors I can safely upgrade to?
i dont suggest contacting maxnc for anything. They will talk to you if you want to spend money, but for general advice ect. Its a crap shoot.
I know you probably do not want to stick alot of money into the machine, but I have done alot of maxnc G540 retrofits. With the gecko G540 and motors, as soon as you wear out the maxnc frame, the controller and motors can be put on a new cnc frame.
The electronics on the maxnc are lame at best. Do not expect to get very long term usage out of them. At least I didnt. 2 to 3 times I had to have my box repaired. I finally said to hell with it and upgraded it.
I guess I'll just deal with it until I need to upgrade. My cutting speeds are good enough at the moment although not even close to the advertised 1500 mm/min. Oh well I guess I shouldn't expect much from the 70oz-in steppers.
Thanks for the help