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Miterfolding on CNC, getting proper cut depth


Good day folks,

We're looking for ways of simplifying getting proper depth cuts on miterfolding 3/4" plywood on the CNC router.

The common problem we seem to have is that we struggle at having the cut depth just a wee bit too much (cut through) or a wee bit to little (and the plywood crinkles/splits when you fold it over).

I realize every CNC out there is a little different from the next on how you index your bits, but basically speaking, how much material do you guys leave on the miterfold joint (the veneer) before folding it over?

Also. I see a lot of videos on Youtube where tape is used on the face of the miterfold joints to protect them in assembly. I'm curious, how are you flipping those over SAFELY to apply tape, without breaking one of the folds?


3/29/17       #2: Miterfolding on CNC, getting proper ...
Alan F.

We put the tape on before we make the cut, we leave about .004. Depending on the part the operator can fold and glue right when he unloads.

3/29/17       #3: Miterfolding on CNC, getting proper ...
rich c.

You are facing off your spoil board aren't you?

3/30/17       #4: Miterfolding on CNC, getting proper ...
Alan F.

We do on both pod and rail and flat table.
Either way we use a horizontal arbor.
Vertical cutters push the spoilage to the bottom of the cut so if you are using a vertical spindle you may want to do a hogging pass and then a fine pass for the last 1/8 -1/4

All the dedicated miterfold machines apply the tape as the panel feeds through the machine and use a horizontal arbor.


3/30/17       #5: Miterfolding on CNC, getting proper ...
Alan F.

A lot of machines can use an aggregate like this.

Moulder head

3/30/17       #6: Miterfolding on CNC, getting proper ...
Alan F.

Old Tooling drawing

Click the link below to download the file included with this post.


4/1/17       #7: Miterfolding on CNC, getting proper ...
katz Yaakov

with poly board +knest only software
you can do any shape any angle
simple tool
this cabinet created in last exhibition in Guangzhou last week with simple cnc without even tool change

View higher quality, full size image (1040 X 780)

View higher quality, full size image (1040 X 780)

4/4/17       #8: Miterfolding on CNC, getting proper ...

A lot of helpful answers, thanks.

Regarding facing off the spoilboard (flycutting), we don't necessarily do that immediately before doing a miterfold.

That's one of the things I'd like to mine from you guys. Do you always flycut right before doing a miterfold?

Alan, thank you especially. I have not personally seen a head like that used on the CNC but I can see why it would be helpful. I'm assuming the head you're showing me basically is a 90-degree transfer case so the you can use cutters that rotate like a saw blade. We've just been using the standard 90.5 degree V-groove shaper type tool with blade inserts.

We will try also making relief/hogging cuts, that will probably give us better results.

4/5/17       #10: Miterfolding on CNC, getting proper ...

We have a moulder head like Alan showed, but we typically don't use it for mitre folding. When cutting mitre joints, we flycut the table first so that the force of the V-groove saw or router bit doesn't force material into the void created by a previous tool path. The saw we use has a 9 inch diameter and works well. The downside is that you need extra room in a nest to drop it down and not foul another part. If the yield is too tight for the saw, or the mitre is curved, we just use a router bit. Also, we find that 2 cuts work best for out set up. Final depth = Z0.0 final cut only 0.03" in depth.

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