Northwood Dado Blade Set — and the Amazon Alternative

Northwood is a value brand with patchy distribution, so rather than chase availability, here is what actually separates dado sets — and the prior question of whether you can use one.

Can your saw take a dado stack?

Ask this first. A dado stack needs enough arbor length for the full width of the stack plus the nut, and it needs the riving knife removed.

Saws built to European and Australian machinery standards frequently have deliberately short arbors for exactly this reason, and a riving knife that is not designed to be removed. On those machines a dado stack is not merely inadvisable, it will not physically fit.

If that is your saw, a router with a straight bit and a guide does the same job, more slowly and with a cleaner result in veneered ply.

Stacked versus wobble

A wobble dado is a single blade on an angled hub, sweeping side to side. Width adjusts by turning a dial, which is convenient. Because the blade describes an arc, the bottom of the cut is slightly curved — a shelf sitting in it rocks.

A stacked set is two outer blades with chippers between. Everything runs in one plane, so the bottom is flat. That is the difference, and for housings it is the whole argument.

Shims are the useful part

Plywood is never its nominal thickness, and it varies sheet to sheet. Measure the actual sheet with a caliper, shim the stack to match, and the housing fits.

That is what turns a dado stack from a rough-cut tool into a joinery tool.

The throat plate

A standard zero-clearance insert has a slot for a thin blade. Running a stack through it destroys the insert and possibly more. A dado throat plate with a wide opening is required — buy one for your saw or make one from phenolic or MDF.