Deburring means removing burrs, the small excesses of material, slivers and sharp edges left on the edges of a part after machining, cutting, punching or moulding. A burr can injure an operator, prevent assembly, jam a valve or break loose into a hydraulic circuit.
Several methods exist. Manual deburring, with a file, a scraper or a rotating-blade tool, remains common for one-off parts and hard-to-reach areas. On the machine, combined tools or brushes break the edges at the end of the program. In bulk, vibratory or tumble finishing moves the parts with abrasive media; abrasive brushing and blasting treat the surfaces. For internal burrs and cross holes, high-pressure water jet, thermal deburring (where a gas explosion burns off the burrs) or electrochemical deburring are used. The choice depends on the material, the size of the run and how accessible the edges are.
Deburring concerns almost every part, with varying requirements: a visible part, a part for a fluid circuit, a medical device or an electronic component tolerates no burr at all. The ISO 13715 standard lets you indicate on the drawing the expected edge condition (sharp edge, rounded, or burr allowed). A chamfer or radius, defined on the drawing, remains the best way to specify the result precisely. Deburring belongs to CNC machining as much as to sheet metal and cutting.
In a quote request. Avoid the phrase “no sharp edges” on its own: state the result expected, for example “edges broken 0.2 mm maximum”, and list the areas concerned, particularly cross holes and internal burrs. Manual deburring is human time: the stricter the requirements, the more it weighs on the price, as the guide to the price of CNC machining details.