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For many, many years there has been a long-held belief that Zero Clearance Table Saw Throat Plates give better quality cuts on the underside of the material being cut than non-zero clearance throat plates, and I too, have been a perpetrator of this theory. Many Years ago, before carbide tipped tables became popular and we were still using steel blades, I tested this theory and ... yes, zero clearance inserts did improve the cut.
For some reason, lately, I wondered that with the much better quality of saw blades if this theory is still true or not so I decided to try out a few of the blades I have and see if do cut better with zero clearance or not.
Watch it on Youtube: https://www.youtube.com/embed/h7PpHpZyhKA
I started off by trying some of my crosscut blades on some very dry, fine grain fir. I Set up my table saw first with a Freud 90 tooth cross cut blade and with the zero clearance insert I had made and made my first cut .. they replace the zero clearance insert with the factory non-zero clearance insert and made the second cut ...