Box joint cutter set and tear out

[USS-DDG2]

I've been using the Freud box joint cutter set and get lots of tear-out despite using a backing board. I'm wondering if a regular dado stack would eliminate the problem. Anyone else using this thing? Any tear-out problems?
https://www.amazon.com/gp/product/B000AS...UTF8&psc=1

[Bill_de]

I've been using the Freud box joint cutter set and get lots of tear-out despite using a backing board. I'm wondering if a regular dado stack would eliminate the problem. Anyone else using this thing? Any tear-out problems?
https://www.amazon.com/gp/product/B000AS...UTF8&psc=1

The outside blades on a standard dado set have teeth that are "Alternate Top Bevel" (ATB). That leaves the little points, or rabbit ears, in the two outside corners of the dado.

---

[MichaelMouse]

I've been using the Freud box joint cutter set and get lots of tear-out despite using a backing board. I'm wondering if a regular dado stack would eliminate the problem. Anyone else using this thing? Any tear-out problems?
https://www.amazon.com/gp/product/B000AS...UTF8&psc=1

That's one of the reasons I use the router table and fixture,  That, and it's easier than fiddling with dado blades.  

NB - use a spiral bit.

[rwe2156]

What kind of wood?  Plywood is going to tear out no matter what you do.

What kind of backerboard?  Don't use MDF or plywood.

[castguy2003]

I've been using the Freud box joint cutter set and get lots of tear-out despite using a backing board. I'm wondering if a regular dado stack would eliminate the problem. Anyone else using this thing? Any tear-out problems?
https://www.amazon.com/gp/product/B000AS...UTF8&psc=1

I use a fresh backer board each time I set up my box joint blades. I use baltic birch plywood, no problems here.+

[Alan S]

I have not noticed any tearout when cutting box joints in solid wood with the Freud box joint set.  I don't see the point of box joints cut in plywood.

[jteneyck]

Use a new backer board for each project.  No tear out as long as the work pieces are held tightly to the backer board.  

I like using box joints with Baltic birch plywood because it's an incredibly strong joint that easy to make, and it looks great to me.  



John