[Spinnetti]

So, I like the idea of an ATC, but can't justify the cost for my hobby use. I have a PDB, and looking at stuff on the web, it looks like I could make a simple holder that I bolt to the table, and could use the motion of the head itself as moves towards a tool to trigger a couple switches to activate the PDB. All that's left is some way to tell Mach where the tools are. Can anybody clue me into what's involved with that, or any reason why this wouldn't work for a simple tool changer (could use some die springs below the tool holder to make sure that the tool is fully engaged in the collet)? I'm just thinking it doesn't have to be as complicated as the "official" one.