Please Help? I am building a machine and am stuck on one issue. I am using custom made nylon nuts and 3/8'' threaded rods. This is my first try at this so i am keeping it simple ... My question is how will the stepper motors know how many times to step or pulse for a given distance? Or how do I set the ratio's up for getting this done? For instance if i want to cut a 2'' square, how will the machine or steppers convert the G-code to translate this info into correct and accurate motion?