Stacked dado heads are

• A. made up of two outer blades and inside chippers
• B. a single wide blade
• C. three blades with no chippers
• D. a combination of one outer blade and three spacers

Answer: (A)

Stacked dado heads are adjustable cutters used to create wide dado grooves by stacking blades to reach the desired width. They are built with two outer blades and one or more thin inner chippers placed between them. The groove width is changed by adding or removing these chippers (and sometimes small spacers) between the outer blades, not by using a single wide blade or by using just three blades without any chippers. This setup keeps the blades aligned and yields a clean, centered cut.