: Specifies the minimum and maximum allowable movement for each axis to prevent over-travel.
Without the correct MTD file, your PowerMill simulation is essentially "flying blind." You risk generating toolpaths that collide with the machine head, exceed axis limits, or damage the spindle. powermill mtd file download
: C:\Program Files\Autodesk\PowerMill \file\examples\MachineData . : Specifies the minimum and maximum allowable movement