[balsaman]

I think some use an indexer. I round thing similar to the revolver in a gun. A different tool in each section. The indexer moves around to select the tool, the machine moves to the indexer to pickup the tool. The machine has a mechanical gizmo to lock the tool in place.

I would love to build one for my machine. The trick is to automate the chuck somehow with a pnumatic cylinder or the like.

Eric