This phase made it possible to reach the diameter of the holes to be machined with dimensional accuracies in the 1/100-millimeter range and the corresponding surface roughness.Ĩ. Once the roughing phase was completed, the finishing process was carried out using the same procedure as for the roughing phase, with the difference that a higher speed is achieved due to a differently selected cutting speed. After this phase, the machined hole was measured to verify the obtained diameter and the surface roughness. Rough-turning was carried out with a suitable engine speed, calculated in m/min, depending on the material in connection with the correct cutting speed. After the various parameters such as the speed of the boring bar and the feed rate were pre-set, it was possible to spindle out again. As explained above, the boring bar and the tool holder were reinstalled. Roughing and measurement (only 18 Minutes)Īfter the overlay welding phase, a roughing phase was carried out. The result was a uniformed weld bead without overlaps and interruptions.Ħ. The welding operation was accompanied by an even noise, which confirms correct processing. After setting the correct parameters, the welding application phase was triggered by actuation of the welding lever, which sets the automatic synchronization of the rotation with the feed movement.ĭuring the overlay welding process in which the welding lance applies material on the machined surface, the previously set parameters could be subsequently changed by the potentiometer provided for this purpose. The portable line boring machine BASIC was equipped with the optional kit BASIC 250. With this machining, the diameter of the hole was increased and for this reason the overlay welding was carried out. Restoration of the concentricity of the hole (only 10 Minutes)Īfter completion of all the work related to the assembly of the machine and the control unit, the user performed the restoration of the concentricity of the hole by boring to eliminate any ovalization and residues of oily materials. Thanks to the few and intuitively recognizable operating switches, the user was able to adjust the various parameters quickly and easily.Ĥ. Through an unidirectional DC controller, the electronic control unit controls the drives of the machine by regulating the speed and direction of rotation, and that of the feed of the machine. The advantage of using an electronic control unit Once the machine was attached to the machine holder, the control unit was installed on the corresponding holder.Īfter connecting the cable between the machine and the control unit, the machine and the control unit could be connected to the power supply. Installation of the electronic control unit (only 1 Minute) The appropriate tool holder required for machining was inserted and fastened in one of the bores of the boring bar.īefore starting the work, the boring bar was rotated by hand to check the correct positioning of the tool holder.ģ. The machine was then set up, locked through the threaded ring and the boring bar was inserted. Machine assembly ready to go (only 19 Minutes)Īfter centering, the brackets were positioned and welded on by a fillet weld according to DIN EN 1993 (Eurocode 3). It should be emphasized that the welding mode was preferred over other centering types, as working with this centering kit ensures higher precision for further processing.Ģ. The centering was done in traditional way, by welding the corresponding ELSA centering kit. Centering of the boring bar (only 15 Minutes)īefore starting the welding work, the surface was cleaned. The diameter of the hole to be repaired was 48.5 mm, let’s see together step by step how this repair has been developed.ġ. Optional BASIC Kit 250 for overlay welding.The repair department of the factory has repaired the bushings of a JCB rear excavator in its own workshop.įor the reparation the company SP Centro Edile decided to use following tools: The company has its own concrete plant and is engaged in the production of inert materials in the municipality of Andali (Catanzaro, Italy). Sp Centro Edile is a company that produces, pumps and transports concrete and sells building materials. Thanks to its small size and extreme versatility and precision, SP Centro Edile Srl has been able to carry out the processing directly on-site reducing time and costs compared to a conventional repair. In this case study the boring machine was used on-site to repair the bucket of a JCB back excavator. The Supercombinata BASIC is Elsa’s new answer for the earthmoving sector.
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