Table Saw Dado Stack Shim & Blade Sizer
Determine the exact chipper and magnetic shim combination to match undersized 23/32″ plywood and non-standard stock dados. Input your digital caliper reading to calculate the required outside saw blades, 1/8″ and 1/16″ chippers, and thousandth-inch color-coded shims for airtight cabinet shelving and joinery housing dados.
How Do You Size a Dado Stack for Undersized Plywood?
Modern cabinet hardwood plywood sold as nominal 3/4″ is routinely manufactured undersized at 23/32″ (0.719 inches) or metric 18mm (0.709 inches). Sizing a standard 3/4″ dado stack (0.750″) results in a loose, sloppy joint. To achieve a piston fit, install two 1/8″ outside blades (0.250″), three 1/8″ chippers (0.375″), one 1/16″ chipper (0.063″), and a 0.034″ shim pack (0.020″ + 0.010″ + 0.004″), providing an exact 0.722″ slot with 0.003″ glue relief.
Table Saw Dado Stack Shim Calculator
Calculate the exact blade, chipper, and magnetic shim combination for precise, gap-free joints.
How to Assemble a Table Saw Dado Stack
Follow these four essential table saw setup steps to load chippers, place shims safely, and verify arbor thread engagement:
Measure the Actual Shelf Stock with Digital Calipers
Never rely on nominal dimensions stamped on panel stock. Measure the exact thickness of your shelf or drawer divider using digital calipers at three different locations to catch thickness variations.
Mount the Left Outside Blade First
Disconnect saw power. Slide the left outside blade onto the arbor shaft with the teeth pointing forward in rotation direction. Ensure the inner arbor shoulder is free of caked sawdust or resin.
Stagger Chipper Teeth in Gullets
Install required 1/8″ and 1/16″ chippers one by one. Stagger carbide teeth so they rest in the open gullets of adjacent blades. Carbide teeth must never touch or overlap each other under arbor nut pressure.
Insert Shims Between Chippers & Check Threads
Place calculated magnetic or plastic shims between chippers (never between the outer blade and the arbor washer). Install the right outside blade, thread the arbor nut, and confirm that at least one full thread protrudes beyond the nut face.
Why Calibration Shims Make or Break Cabinet Joinery
A dado joint relies on flat, parallel wood surfaces for structural glue strength. Because end-grain delivers near-zero glue bond strength, the integrity of a dado housing relies completely on friction and side-grain face contact between the shelf cheeks and dado sidewalls.
The 0.003″ Glue Line Room
A dead-flush fit forces glue to wipe off as the shelf is driven home, creating a starved joint. Introducing a 0.003″ clearance provides room for PVA glue film while retaining a firm push-fit.
Arbor Thread Safety Limits
Most 10-inch cabinet saws have a 5/8″ arbor shaft capable of supporting up to a 13/16″ (0.812″) stack. Never stack chippers so wide that the arbor nut threads do not fully engage the arbor shaft.
Magnetic vs. Plastic Shims
Magnetic shims cling directly to steel saw plate bodies, preventing them from falling into table saw dust chutes during arbor loading. Plastic color-coded shims work well but require careful alignment over the arbor threads.