Method of machining a thermosetting laminate

A method for planing a thermosetting laminate, the planing being an edge chamfering of the thermosetting laminate carried out by means of an apparatus comprising at least one high-frequency or ultrasonic oscillation generator and at least one dimension changing or adjusting unit having at least one piezoelectric crystal performing a linear vibration when charged with an alternating current, the linear vibration being propagated through at least one amplitude transforming unit, whereby generated high-frequency or ultrasound is transformed into a linear vibration which during said edge chamfering is propagated via at least one tiller to at least one tool attached to said tiller, said tiller being connected to said amplitude changing unit and said tool comprising at least one diamond, charging the apparatus with electric current;

• and moving the tool including said diamond into contact with the thermosetting laminate to be edge chamfered, whereby at least said tool performs a linear vibrating movement planing said thermosetting laminate resulting in a chamfer of less than 0.30 mm.