becikeja,
Did you purchase the tri-power? It comes with the Mach III post processor CD, which you should load onto your computer. One mistake I made was to not deleate the Mill3.xml and Turn3.xml file in the Mach III software. Open your Mach III program under the windows explorer and find these two file and deleate them, then make sure you copy these two files from your Mach III CD over into the Mach III file on your computer. If you purchased the Tri power make sure you sheck out the Z axis spindle movment. Mine was very hard to move and actully jambed bending the o-ring bracket on the bottom. If you have this problem you should call john at Shopmaster and he can lead you thru the fix.
Ben