Hello everyone, I am not an engineer, so I apologize if this is a relatively simple question. What's the best way to turn rotational motion into linear motion under the following circumstances? 1. Rotational motion is driven by a vertical bolt. 2. When turned, the bolt will extend a bar horizontally to apply pressure to an object. 3. The bar should remain fixed unless the bolt/screw is turned (there will be constant pressure exerted against the bar). Hopefully I explained that clearly. Here's a link to a quick sketch: https://www.dropbox.com/s/djyrgydd2j59b9l/drawing.png?dl=0 (sorry it turned out kind of small) In my searches I came across a rack and pinion which looks like it could possibly work. However, it's not entirely clear to me if it can be designed to satisfy point #3? I look forward to your suggestions.