What this is
Cut a piece of aluminium with a router and you get a clean shape — and a sharp burr along the edge that'll slice the installer's hand. Deburring is the step that takes that off. A small chamfer, just enough to dull the edge, run along every cut and drilled-hole rim. It's a quick step and we do it as standard on metal cuts; for plastics and timber it's on request and depends on the part.
On aluminium plate and sheet, deburring is non-optional from a safety standpoint and we include it on every metal cut. On ACM and other composite panels, the cut leaves a small burr at the aluminium-skin edge that needs a light deburr to be safe to handle. On polycarbonate, the cut edge can have small flashing that deburring removes. On MDF, ply and timber there's no burr in the metal sense — sharp edges are part of the cut — but light edge-break on a routed corner can be deburred to soften the feel.
For drilled holes specifically, the burr forms at both the entry and exit faces. We deburr through-hole rims as standard on metal drilling; for plastics, by request. Tapped holes always get the entry chamfer cleared so the screw threads engage cleanly.
If the finished surface is critical (anodised aluminium, painted ACM), tell us — deburring on a coated surface needs more care to avoid damaging the finish.