Dressing plates are bases made in G25 or G30 grey cast iron used in the general mechanical sector to control or mark pieces in any material and shape. The composition of the material is particularly suited to these applications since pearlitic structured lamellar cast iron has an excellent thermal stability and therefore almost constant precision, guaranteeing very moderate flatness characteristics. This is why they are used for measuring, controlling and marking mechanical components of any shape and size, in any phase of the production process.

The G25 cast iron is supplied with hardnesses ranging from 180-210 HB and a tensile strength of around 260 N/mm2 while the G30 has a hardness of between 190-230 HB and a tensile strength of 300 N/mm2.

The surface, called a plate, is perfectly flat, complying with standard DIN 876 regarding the flatness of machined surfaces; the part underneath the plate is formed by ribs which increase the rigidity of the base according to the weight the structure will have to bear. The machining of the surfaces and the side bands is planned with the customer so as to be able to obtain plates on which surface gauges or measuring elements will slide.

These plates can be produced using three types of moulding depending on the production requirements:
•full-scale pattern
•core box pattern
•EPS pattern

When the moulds have been prepared, the iron is cast.

The process ends with an accurate slow cooling of the casts in the moulding box, to obtain a good spread of the internal tensions caused by non-homogenous masses present in the casting structure (difference of thickness between ribs and plate), and therefore maximum machinability and an excellent stability of the finished part.

Dressing plate production starts from single pieces measuring from 2000x1500 mm to 7000x2500 mm.

Modularity is a fundamental characteristic in order to adapt to any construction layout.

As levelling accessories we supply support columns or electro-soldered and painted tubular steel supports in various sizes, depending on the customer’s requirements, all with the possibility of being adjusted using micrometric screws.

Our company also offers an installation and mounting service, providing, at the end of installation works, inspection certifications and certifications of conformity for each job.

As an alternative to our standard products shown in the catalogue, G.Bonanomi can also produce any size, using any material, to satisfy all the needs and requirements of the customer.

Part of a levelling trough with M55 x 2 levelling element

Dressing plate with bushing grill H 7