If you’ve ever tried to dado with the table saw, you’ve probably realized that it’s not easy to adjust the width by making multiple passes. If we could reduce the number of passes needed, we would likely achieve greater precision, so having some kind of dado blade set would be useful. According to Matthias, they are banned in Europe (I really don’t know the current situation), and they certainly wouldn’t be cheap.
One option could be to place two or three regular blades side by side, but if we go back to the idea that dado blades are banned in Europe, I suppose we’re just feeding our fears… this seems dangerous! The truth is that after reading his article, I would say Matthias feels quite comfortable with this system and downplays the issue.
Personally, one of the things that scares me is the blades coming loose, although I believe the bolt on my saw is long enough to securely tighten two or three blades together. Also, the machine rotates in a direction where the force on the bolt is in the tightening direction, making it unlikely to come loose. Another concern is whether this would increase the risk of the dreaded kickback, although when dadoing with the table saw, we tend to be more careful than when making other types of cuts.
As always, you have the link to this Woodgears article in Spanish on the woodworking projects page of this blog, and there you can find the translations of Woodgears (no. 19).