Corner offset machining is similar to constant offset machining.

However with this technique, rather than starting from an outside boundary and working in towards the centre of the part, a set of pencil milling passes are created on the features of the part, then a toolpath calculated over the whole part from those features. The toolpath maintains a constant and equidistant surface finish over the whole part. The resultant surface finish in the corner is significantly better than 3D constant offset machining depending on the shape of the part, as the toolpath follows the 3D form and features and can be used in conjunction with cutter contact angles.