Smooth Plywood Cuts with CNC Equipment
You might want to try a different species of plywood core. Maybe poplar core, or apple ply. The Baltic birch is difficult to cut without fuzzing.
Is the edge of the off cut a nice finish? If so, cut in the other direction.
How large are the parts you are cutting? If you can get enough VSA (vacuum surface area), you should be able to cut the parts without tabs or secondary sanding.
You should be cutting at 18,000 rpms and climb cutting. With that small of a diameter and with a down shear, the chips are not going to evacuate, thus they are being recut. If you can't use an upshear, try a straight flute solid carbide.
We cut 12 mil and 15 mil Baltic at 500 inches/minute using a 3/8" down spiral (57-325 Onsrud Cutter) at 18000 rpms, and the edges are smooth, with no fuzz. This may be pointing out the obvious, but this kind of bit only cuts well on one side. In our case, the inside, going in a counterclockwise motion. Make a full circle around the part, or go to a point and come right back to where you started to make it smooth on both sides of the cut.
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