Choosing a Stacked Dado Blade: What to Look For
A stacked dado blade is one of the most useful accessories you can add to your table saw. With the right dado blade set, you can cut clean, accurate dadoes, grooves, rabbets, and other joints that are essential for building cabinets, drawers, shelves, and furniture.
Unlike a standard table saw blade, a stacked dado set cuts a wide groove in a single pass. This makes it faster and easier to produce consistent joinery without making multiple overlapping cuts.
But not all dado blade sets perform the same. Differences in tooth design, blade diameter, chipper configuration, and adjustment options can affect both the quality of the cut and how easy the blade is to use.
Here's what to consider when choosing a stacked dado blade for your table saw.
What Is a Stacked Dado Blade?
A stacked dado blade is a specialized table saw accessory designed to cut wide, flat-bottomed grooves in wood and plywood.
Instead of using a single blade, a stacked dado set combines multiple cutting components to create a groove of the desired width.
A typical set includes:
- Two outer scoring blades that cut clean shoulders along the edges of the groove.
- Several chipper blades that remove the waste between the scoring blades.
- Shims that allow you to fine-tune the overall cutting width.
By combining different chippers and shims, you can adjust the width of the dado to match the material you're working with.
This versatility makes a stacked dado blade especially useful for cabinetmaking and furniture construction.
Choose the Right Dado Blade Diameter
Stacked dado blade sets are commonly available in 6" and 8" diameters.
Both sizes can cut the same types of joinery, but the larger blade provides greater cutting depth.
6" Dado Blades
A 6" dado blade is a practical option for many woodworking tasks. It requires less power to operate than a larger blade and can handle most common dadoes and grooves used in cabinet construction.
However, the smaller diameter limits the maximum depth of cut.
8" Dado Blades
An 8" stacked dado blade provides additional cutting depth, making it useful for deeper dadoes, rabbets, and other joinery.
For a table saw designed to accommodate an 8" dado set, the additional capacity can be worth the investment.
Before purchasing either size, check your table saw manufacturer's specifications. Not every table saw is designed to accept stacked dado blades, and some models have restrictions on blade diameter or maximum stack width.
Look for Clean-Cutting Scoring Blades
One of the most important considerations when choosing a dado blade is the quality of the cut.
Ideally, a dado blade should leave two clean shoulders and a smooth, flat bottom. The outer scoring blades play the biggest role in producing clean edges.
Each scoring blade uses a combination of beveled cutting teeth and flat raker teeth.
The beveled teeth score the edges of the dado, while the flat teeth help create a level bottom.
Because each scoring blade cuts one side of the groove, stacked dado sets include a dedicated left and right scoring blade.
Why Scoring Blade Teeth Matter
The number of teeth on a scoring blade can affect the quality of the cut.
Some dado blade sets have as few as 12 teeth on each scoring blade, while others have considerably more.
But more teeth don't automatically mean a better cut.
A well-designed 24-tooth scoring blade can produce excellent results in both solid wood and plywood.
The quality of the carbide teeth and their cutting geometry are often more important than the total tooth count.
Understand Dado Blade Tooth Geometry
The shape and angle of the teeth also affect how cleanly a dado blade cuts.
Two important features to consider are the hook angle and tooth bevel angle.
Hook Angle
The hook angle describes the angle of the front face of a cutting tooth relative to the blade's center.
Some stacked dado blades feature a negative hook angle of approximately 5° or more.
A negative hook angle can help produce cleaner shoulders and reduce chipping, particularly when cutting plywood and other veneered sheet goods.
This is a useful feature to look for if you frequently build cabinets or work with plywood.
Tooth Bevel Angle
The bevel angle of the scoring teeth also influences the quality of the cut.
Many dado blades use a bevel angle of approximately 20°, although some feature steeper angles.
A steeper bevel can improve the scoring action and help produce clean edges.
The goal is a blade that cuts through the surface fibers before the remaining material is removed.
[IMAGE: 5349991_snip_1548387687102.png — Illustration showing scoring tooth bevel geometry.]
Why Chipper Blades Are Important
While the scoring blades establish the edges of the dado, the chipper blades remove the waste between them.
Chippers use flat-ground teeth designed to cut a smooth bottom.
The number of teeth on each chipper can make a noticeable difference in how the dado blade performs.
Less expensive dado sets may have only two teeth per chipper.
Higher-quality sets often feature four or six teeth.
Additional chipper teeth can provide several advantages:
- Smoother, flatter dado bottoms
- Less noticeable machining marks
- More consistent cutting action
- Easier feeding through the cut
If you regularly cut dadoes in plywood or hardwood, a set with four- or six-tooth chippers is worth considering.
Choose a Dado Set with Versatile Chipper Sizes
Another important consideration is the number and thickness of the chippers included in the set.
Most stacked dado blades can be configured to cut grooves ranging from approximately 1/4" to 13/16" wide, although the exact range varies by manufacturer.
The difference between dado sets is how easily you can achieve a particular width.
A basic set might include only three chippers, while a more versatile set may include six.
Higher-quality sets commonly offer several chipper widths, including:
- 1/8"
- 3/32"
- 1/16"
Having more chipper sizes gives you greater flexibility when setting up the blade.
This is especially useful when working with plywood.
Cutting Dadoes for Plywood
One of the challenges of cutting dadoes for plywood is that the actual thickness often differs from its nominal size.
For example, a sheet sold as 3/4" plywood may measure less than 3/4" thick.
If you set your dado blade to cut a full 3/4"-wide groove, the plywood may fit loosely.
A dado set with multiple chipper sizes makes it easier to match the groove to the actual thickness of the material.
For accurate cabinet joinery, always measure the plywood and make a test cut before cutting the project parts.
Use Dado Blade Shims for an Accurate Fit
Even with several chipper sizes, you won't always be able to assemble a stack that cuts the exact width you need.
That's where dado blade shims come in.
Shims are thin discs that fit over the saw arbor between components of the dado blade stack.
They allow you to make small adjustments to the cutting width without changing the main chipper arrangement.
Shims are commonly made from:
- Plastic
- Brass
- Steel
- Paper-based materials
Some dado sets include shims, while others require you to purchase them separately.
Magnetic Dado Shims
Magnetic shims are particularly convenient because they stay in position against the blade components during setup.
This helps prevent the shims from slipping into the arbor threads as you assemble the stack.
For woodworkers who frequently change dado widths, a good shim set can save considerable setup time.
Always follow the dado blade manufacturer's instructions for shim placement and minimum spacing between cutting components.
How to Set Up a Stacked Dado Blade
A quality dado blade can produce excellent results, but careful setup is essential for accurate joinery.
Before installing a dado set, disconnect the table saw from its power source.
Follow these basic steps:
- Check compatibility. Confirm that your table saw supports the diameter and maximum width of the dado stack.
- Install the scoring blades. Position the left and right scoring blades according to the manufacturer's instructions, with the correct cutting orientation.
- Add the chippers. Select the combination needed to produce the desired groove width.
- Fine-tune with shims. Use the recommended shims to adjust the cutting width.
- Check the assembly. Make sure the teeth do not interfere with one another and that the arbor nut is properly secured.
- Install a suitable dado insert. Use a throat plate designed for the dado width and your saw.
- Make a test cut. Check the width and depth of the groove before cutting your project parts.
When cutting dadoes, use appropriate workpiece support and a suitable miter gauge, sled, or other fixture. Never make a freehand cut at the table saw.
Also remember that a stacked dado blade is intended for non-through cuts. The standard blade guard generally cannot be used with a dado set, so follow the saw manufacturer's instructions for suitable guarding, hold-downs, and other safety measures.
Is an Expensive Dado Blade Worth It?
A stacked dado blade is an investment, but the right set can improve both the quality and efficiency of your woodworking.
Less expensive sets can handle basic joinery, especially when you're working primarily with solid wood.
However, higher-quality dado sets often offer advantages that become noticeable with regular use.
These may include:
- Cleaner shoulders with less tearout
- Flatter dado bottoms
- More chipper sizes for easier setup
- Smoother cutting action
- Better carbide teeth and blade construction
- More precise width adjustments
If you frequently build cabinets, furniture, drawers, or shop projects, investing in a quality stacked dado blade can save time and improve the fit of your joinery.
What to Look for When Buying a Stacked Dado Blade
When comparing dado blade sets, focus on the features that have the greatest effect on cutting performance.
The Bottom Line
A good stacked dado blade can turn your table saw into a versatile joinery station.
Whether you're cutting dadoes for cabinet shelves, rabbets for drawer bottoms, or grooves for frame-and-panel construction, the right blade makes the job easier and more accurate.
When choosing a dado set, don't focus only on price or the number of teeth. Pay attention to the scoring blade geometry, chipper configuration, and ability to make precise width adjustments.
A quality set that produces clean shoulders and flat-bottomed cuts is an accessory you'll appreciate every time you use your table saw.
Build a Custom Dado Blade Storage Case
Keep your stacked dado blade set organized, protected, and ready for your next woodworking project. This shop-made storage case holds the scoring blades, chippers, and accessories together in one convenient place. Learn how to build it with step-by-step plans from Woodsmith.
GET THE STEP-BY-STEP WOODWORKING PLANS → Build a Dado Blade Storage Case
