I like Mach 3 but for a single axis task like this you'd be much better off with a PLC and an HMI with a recipe function. PLCs get up in the morning and go to work every day for years without complaining about the need to reboot, update the firmware, software whatever. They are made for this task and you'll have your saw cutting with a PLC before you even figure out how to configure Mach 3 for this task.