thanks for the reply niclos,i have been using bobcadcam and mach3 as post processer, every thing works great.i have a demo of mastercam and noted it did not have mach3 in its system,when checking on the net users were not impressed when mach3 was used as post processer in v5.I know that it works well with earlier mastercams, i was just trying to get feed back on how to load it into the mastercam post/machine system.I can get mastercam to generate its g code and then save it to usb and then use my cnc router which has mach3 on it.just checking if others use it,thanks again for reply.