Using rack and pinion for linear motion

@jremington @Paul_KD7HB
I don't have a drawing yet, I am in designing stage. Most videos I saw on youtube showed fixed pinion and moving rack, like I mean linear motion is moved to the rack and it starts to move linearly. But for my case I want the opposite so I wanted any help on how do so or just a simple real life example in very short video is more than enough.