The need to curb workmanship costs has led to study and design an alternative to ordinary self-centering chucks, in order for them to fully use the capabilities of machine tools.
O.M.A.P. "autofretting" face drivers were launched on the national and international market in the 70’s.
They were aimed for mass work on lathes, automatic lathes, duplicating lathes, lathes with hydraulic-thrust and revolving work support. They are also perfect for application to small serial work on center lathes.
Highly reliable, simple and sturdy, they solve remarkable workmanship problems between centers, including parts with holes, pipes, unrefined and flanged parts, etc., and avoid their sliding under manufacturing load even when very severe:
they keep manufactured shoulders at a constant distance from support faces;
they revolve partshaving unfinished faces;
they process a wide range of diameters by the use of a few scalar-quantity drivers;
they enable the replacement of pins to quickly switch from one diameter to another with no need to disassemble driver parts;
sturdily manufactured out of adequately selected and processed steel, they do not alter centering accuracy under working load.
O.M.A.P. drivers work by virtue of mechanical action and are characterized by their "autofretting" quality (under patent). An appropriate pressure set at the work support - workpiece unit induces an "autofretting" axial movement that is proportional to the required load to be chipped, owing to the twisting moment effected by the tool and the configuration of driving pins.
When machining, the unit composed of pin, ball andequaliser ring, interdependent yet free to swing, stops on any unevennes detected on the support face of the workpiece and therefore prevents slipping.
The center is inserted from a rear plug. It is capable of an independent axial movement that grants a high margin of safety under malfunctioning or false working moves. Return springs and shock absorbers recall pins to their origi- nall position after work.