A zero-clearance insert is the key to a chip-free cut. This is simple enough when using a standard saw blade. But when it comes to a dado blade, it can be challenging. The various widths of different cutter and chipper combinations, plus the addition of shims, means you have to create multiple inserts.
Making the inserts isn’t difficult, but trying to remember which insert to use can lead to mistakes. That’s why I write the combination of cutters, chippers and shims on each insert so I never have to guess again. It’s a simple solution that works.