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I need to get very then dado on the edge of some 1/4 material. The dado will only be 1/8 thick. So it will be lip of board. I will just be using my standard kerf blade to make the waste cut. What is safest way to do this? Make the cut with blade on outside edge of board with other side riding fence? Or make sacrificial fence and run the non thru cut right up to fence? I am working with a saw stop, just inexperienced with dado cuts.

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Safest is always to make a sacrificial fence. Just clamp a straight board to the fence and raise the saw blade into it. The kickback that could happen the other way is the problem. You never want to have a situation where there is a possibility of the material binding between the fence and the blade. You then have the possibility of a projectile that could hurt you or damage things in the sop. That is something that a saw stop cannot protect against.
 

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I would use a sacrificial fence. Mark your fence the desired finish height of cut. Lower the blade. Move sacrificial fence over blade and raise blade to your mark. Reset the fence to desired finish position (as long as it doesn't exceed the width of the blade) and execute cut. You may need to fine tune your fence position, test a piece first.

I see that mbzguy & I were typing at the same time. If you can't use a clamp to hold the sacrificial fence because of stock height consider screwing the sacrificial fence to your table saw fence On mine used self tapping metal screws that were counter sink into the sacrificial fence.
 
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