Hi bshahi - There are many free cam packages that will calculate toolpath time, why reinvent the wheel. Try camotics. Plus tool suppliers will provide tables with suggested DOC and feed rates for different materials. ...Your trouble will be that a tool does not have constant feed speed. The CAM velocity planner adjusts the tool velocity depending on the path curvature (eg around a 90deg turn) , acceleration settings and even jerk settings so it's not as simple as it seems...Peter