Method of machining parallel grooves in the underside of a floor panel

A method of machining parallel grooves (17, 21, 22, 28) in an underside (12) of a floor panel (2), using a device (1) with rotary machining units (3, 4) in a form of cutting heads (10, 11, 27), the method comprising:

• inserting the floor panel (2) between a lamellar retaining transport assembly (7) and a lamellar pressing transport assembly (8, 9);
• clamping the floor panel (2) between the lamellar retaining transport assembly (7) and the lamellar pressing transport assembly (8, 9) and subjecting the floor panel (2) to a feed motion through linear movement;
• putting the cutting head (10, 11, 27) into a rotary motion around the axis of rotation (X1, X2, X3;
• Y1, Y2), and
• machining the parallel grooves (17, 21, 22, 28) in the underside (12) of the floor panel (2), using the feed motion imparted to it by the lamellar retaining transport assembly (7) and by the lamellar pressing transport assembly (8, 9),
• wherein
• machining of the parallel grooves (17, 21, 22, 28) in the underside (12) of the floor panel (2) is performed with the cutting head (10, 11) comprising a set of axially separated profile disk cutters (33.1, 33.2, 33.3, 33.4, 33.5, 33.6, 33.7;
• 39.1, 39.2, 39.3, 39.4, 39.5, 39.6, 39.7) with stepped diameters (D1, D2, D3, D4, D5, D6, D7), and wherein the machining of the parallel grooves (17, 21, 22, 28) takes place at the inclination of the axis of rotation (X1, X2;
• Y1, Y2) of the spindle (23, 24) of the cutting head (10, 11) at an angle (+α, α) relative to the plane of the underside (12) of the machined floor panel (2).