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Blowout from dado

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Everytime I try to use my dado set on pine it blows out. The blades don't look bad but couls that be the problem? With 2 x 4's or 1 x 6's , it doesn;t matter.

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Is the material milled true? The irregular surfaces of construction lumber combined with the true plane of a tablesaw’s blade spin do not marry well together. A rough reference surface yields a rough result.

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Welcome to the forums!

To add to Gee-Dub's post, is the blade sharp and set up properly for the saw?  

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Applying tape can reduce tearout some but clean sharp blades, zero clearance throat plates and backer boards are important too.

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I'm doing the Steve Ramsey project where you make a step stool out of a 2 x 4. Most of it is 15 degree angles.. I sent out my blades yesterday so maybe that will work. I had the same problem when I made a box joint glove box. The backer board didnt help so we'll see when I get the blades back.

Thanks to everyone

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If you're cutting box joints on the long grain, chances of blow out are very high even on hardwoods even with a backer board and a new blade. And even if you succeed, you will be making a weak joint.

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I did a large pine chest years ago with box joints and had some blowout also even with a sharp dado blade and backer board. I no they make a box joint dado blade set and often wondered if that would help.

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It is a pain but with tear out prone material, clamping the stock to the backer board/fence will cure the blowout. Clamp,  cut, un-clamp, move, clamp, cut, etc. Despite how strong you think your hands are, they’re not that strong.

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