I need to make a lot of precision cuts in brass tubing for a project I'm working on. I'm using a Dremel with a cutoff wheel and a vise. The Dremel is strapped to my workstation via a set of wooden tracks so it can slide to and fro, enabling me to cut the tubing in the vise. It's not accurate enough. I need sub-millimeter precision. I am considering re-making a jig using metal tracks so it's more rigid, but the effort may be prohibitive, since I'd need ways of securing and releasing it, and that adds complexity. My question is: does something similar exist (or something I can adapt)? I'm happy to start with a base and modify it as-needed. I'd Google it, but I'm not even sure what I might call it, except "jig".