Dado tearout?

Too high a feed rate. Slow it down and you should be fine. it could also be the grain of the lumber

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Any blade can tear out on exiting the board. I cut a couple hundred poplar cabinet door styles and rails today. At the shop I use a big, digital sliding table saw. I used a scrap as a backer for every single cut.

If you are using the miter gauge, then attach a piece of scrap MDF or Ply to back up the cut. If you are dadoing off the rip fence, a square of scrap pushed along behind your part will act as the backer.

The point is that the fibers of the wood need to be supported as the blade exits, or else they are likely to break along the grain lines rather than be cut. You should be using a backer for cross grain cuts with a router bit too, and even handplanes!

Hope this helps,

Ralph

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I agree with MedicKen on slowing down the feed rate on a table saw.

Even better, if you have a radial arm saw, is to dado with that tool rather than a table saw. A radial arm saw cuts the dado as the blade teeth ENTER the surface of the wood while a table saw cuts the dado as the blade’s teeth EXIT the surface of the wood.

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Thank you all I will try backing up with a scrap piece and slow down

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I like bentlyj and handi’s advice. Cutting acroos the grain will usaually cause a certain amount of blow-out. When practical, use a back-up board. That will also help.

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you could also use some painters tape on the cutline…but a backer board is better.

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