How do you set the width of a dado blade stack on a table saw?

• A. Tighten the blade and hope for the best.
• B. Install the right dado stack, adjust the blade to the required width, align with the fence, and verify with a test cut.
• C. Use a fixed blade and estimate width by eye.
• D. Use random widths and trim later.

Answer: (B)

Setting the width of a dado blade stack is about precise setup and verification. Start by installing the correct dado set for the width you need, with the saw powered off and the insert removed so the stack sits true on the arbor. Add or remove shims between the blades to reach the exact width, then tighten everything and ensure the stack runs flat and true.

Next, align the cut with the fence. Position the fence so the dado will occur at the desired location on your stock, and make sure the fence is parallel to the blade and the stock sits cleanly against it.

Finally, verify with a test cut. Make a dado in a scrap piece, measure the groove with calipers, and adjust the stack width if needed until the groove matches the required dimension. When a test piece checks out, you can proceed with the actual workpieces. This approach yields a precise, repeatable dado size and a safer, more reliable cut.