OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 6 1 4 To control the electrochemical processes during the investigation, the test bench was additionally fi tted with the proprietary current polarity control board and relay block, which were coordinated with the existing step motor control board of the machine. Such confi gured device was housed inside the integrated control unit casing made by additive manufacturing, see in fi g. 4. At the side of the integrated unit, there are “IN” and “OUT” terminal blocks. The purpose of these blocks is to supply DC to the integrated control unit and transmit current pulses of the appropriate polarity to the material to be machined and the grinding wheel. To start the investigation, fi rst, the step motors were calibrated. For this, proximity switches were used. Using these switches, the initial position of the machine slides in the machine’s coordinate system was set for correct execution of the process sequence. The process sequence programmed with the G and M codes is conveyed from the PC memory to the Arduino control board via USB connection. The process sequence controls the machine drives and current polarity of the circuit comprising the current source, current switching unit, conductive grinding tool and the material to be ground. Fig. 2. CNC machine control circuit using Arduino Fig. 3. Experimental stand: 1 – machine table; 2 – connecting terminal; 3 – device for installing the workpiece; 4 – diamond wheel; 5 – brush device; 6 – stepper motor; 7 – integrated control device; 8 – display unit Fig. 4. Integrated control device
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