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What are the types of burr?

Shop for Deburring Tools

Different types of burr can be produced during manufacturing. The type of burr depends on how the workpiece is machined.

There are four main types:

Poisson burrs

Poisson burr, where the material spreads sideways With poisson (pronounced ‘pwahs-soh’) burrs, the machined material bulges outwards when the tool is applied to the workpiece under a downward force.

This burr can also occur on the edge of the workpiece when the tool removes a layer from the surface laterally.

Wonkee Donkee says: 'The name ‘poisson burr’ derives from ‘Poisson’s ratio’, which accounts for the lateral deformation of materials.'

Roll over burrs

Roll over burr, where the material is rolled ahead of the cutting tip Roll over burrs are typically produced when a cutting tool exits a material. The sharp tip of the tool pushes the material rather than cutting through or chipping it, thus creating a burr.

Tear burrs

Types of burr; tear burr; burr caused by drilling or punching A tear burr is created when material is torn away from a workpiece, rather than being sheared. This usually occurs during punching or drilling.

Cut off burrs

Cut off bur is when the material is torn away before the cutting process is complete Cut off burrs are produced when a portion of material falls away from the main workpiece, tearing it and leaving a burr behind.