thanks for the reply; i will check on the other values. i think you are right though,on the wcs, because when i zoom out, it shows it up and to the rirght of my drawing. i cant seem to get the wcs to move to the corner of my part and stay there. need to learn some more on the wcs position, and how to get it to move and stay there

I have a 2 x 4 CNC Router i made ,and i amd useing mach 3 to control it. I Have the Mach 3 PST file. but when i post the gcode,it puts a - 36 in move and it hits my limit switches. Do i need to create a new Machine Defination File? of a Post Processor File? I set my WCs to lower left corner of the part stock wich is 15 in y and 20 in x I m just learning Master cam X5 router, and has me stumped. Thanks for any help