Hi, I have been running my Wessel (ex pcb drill/router) as a highly accurate router for about 10 years with an AMC 4 controller (servo version) and have never had any problems. I do use WINAMC (for drip -feeding and config files to over-ride the flash memory) which I believe was a free download at some stage, but has now been removed. There is a possibilty that I can get hold of a copy if you decide to go down that route. G.