The degree of quality required for the ribs must be equal to that required for the soundboard. The ribs help the soundboard distribute vibrations evenly. In addition, the ribs serve to stabilize the soundboard and help it withstand the pressure exerted by the strings.

The ribs are glued over the gluing bed of the soundboard (inner strip). The gluing surface with the soundboard is slightly planed convex to facilitate the formation of the convexity of the soundboard itself.

It is important that there are at least 8 ribs and that they extend to cover the inner strip. The ribs and the soundboard must fit perfectly with the gluing surface on the inner strip, which means that the gluing bed must have grooves for inserting the ribs. The width, height, and shape of the ribs vary depending on the manufacturer.

The total length of the ribs in a 100 cm high upright piano is about 8.50 meters. In a 130 cm high upright piano, it is about 10.00 meters, while in a 200 cm long grand piano it is about 9.60 meters. The total number of ribs varies depending on the size of the instrument, usually between 8 and 12.

The ribs are always placed orthogonally to the direction of the fibers of the soundboard. They must be glued with moisture-resistant glue and sometimes screwed onto the back of the soundboard. In new instruments, before the strings are installed, the apex of the convexity of the soundboard should be located, measuring transversely to the direction of the fiber, 5 mm higher than the edges and measuring along the direction of the fiber, 7 mm higher than the edges.

In refurbished instruments, the string pressure (load) should be 1-2 mm in the treble, 2-3 mm in the middle, and about 2 mm in the bass.

The next step is to moisten the veneer with water to promote the adhesion of the fibers to the edges. This operation ensures optimal results during the subsequent sanding of the soundboard. After the soundboard parts have been dried, sanded, and cleaned, they are sent to the equipped laboratory for surface finishing. Between each coat of varnish, the new layer of varnish is sanded.

The grill beams, the case, the soundboard, and the soundboard ribs are shaped to ensure adequate union. These parts are then glued together and the sides of the grill are cut with saws parallel to the same depth. The soundboard is purchased in the form of a square board, without ribs and bridges, and is seasoned. Wood thicknesses placed between one board and another allow air to circulate freely. Subsequently, the boards are placed in special drying rooms. The ribs are curved to promote the bulge of the soundboard and then cut to specific lengths. Each end of the ribs is tapered to ensure the elasticity of the board.

The bass and treble bridges are cut with a specific wood machine. Subsequently, the bridges are aligned in another machine controlled by a computer that makes the necessary holes for the insertion of the bridge pins, cuts the sharp profiles of the bridges, and installs the pins. This machine is extremely sophisticated and ensures uniform and precise bridges.

Next, the bridges and ribs are glued to the soundboard in a form. The bridges are placed upside down and covered with glue, and the soundboard is positioned upside down on the part of the bridges previously covered with glue. The ribs are now covered with glue and placed in the correct form for gluing to the soundboard. Each part is then pressed with a hydraulic press until the glue has completely hardened. Once the soundboard is completely dry, the bridge pin is masked and the board is spray painted after the first coat, the board is carefully sanded and painted a second time. Subsequently, it is glued to the piano grill and the cast iron plate of the frame is installed.

The plates are purchased from Parca Norrahammar, a foundry that also produces plates for other piano manufacturers. The plate is carefully drilled and spray painted before the installation of the tuning pins. A computer-controlled machine makes all the necessary holes. In the piano factory, the plate is fixed on-site, after which the tuning pin buttons are installed. A very dense felt is glued to the plate, right in front of the plate pins, and then thinned down to achieve the correct string load pressure on the soundboard.