Electrolytic grinding apparatus

Claim 1

IN ELECTROLYTIC GRINDING APPARATUS, IN COMBINATION A WORK-SUPPORT AND ROTATABLE WHEEL MEANS HAVING A CONDUCTIVE PART WHEREBY A CONDUCTIVE WORK-PIECE AND THE FACE OF THE WHEEL CONDUCTIVE PART ARE INTERRELATED FOR RELATIVE MOVEMENT THEREBETWEEN, WITH MEANS FOR SUPPLYING LIQUID ELECTROLYTE TO THE INTERFACE BETWEEN THE WORKPIECE AND SAID CONDUCTIVE PART FOR ELECTROLYTIC DECOMPOSITION AT THE WORK-PIECE FACE, A SATURABLE-CORE MAGNETIC AMPILIFER HAVING POWER WINDING MEANS ENERGIZED BY ALTERNATING CURRENT AND HAVING RECTIFER MEANS IN CIRCUIT THEREWITH TO PROVIDE UNIDIRECTIONAL CURRENT AT ITS OUTPUT TERMINALS AND HAVING CONTROL WINDING MEANS FOR AFFECTING THE CORE SATURATION THEREOF, A SATURABLE-CORE CONTROL MAGNETIC AMPLIFER HAVING POWER WINDING MEANS ENERGIZED BY ALTERNATING CURRENT AND HAVING RECTIFER MEANS IN CIRCUIT THEREWITH FOR ENERGIZING SAID CONTROL WINDING MEANS OF SAID FIRST MAGNETIC AMPLIFER AND HAVING CONTROL WINDING MEANS FOR AFFECTING ITS OWN CORE SATURATION, MEANS CONNECTING THE POSITIVE SIDE OF SAID OUTPUT TERMINALS TO THE WORK-PIECE AND THE NEGATIVE SIDE THEREOF TO SAID WHEEL CONDUCTIVE PART FOR EFFECTING ELECTROLYTIC DECOMPOSITION AT THE WORK-PIECE FACE, MEANS RESPONSIVE TO INTERFACE CURRENT, MEANS RESPONSIVE TO THE POTENTIAL ACROSS SAID INTERFACE, MEANS CORRELATING SAID TWO LAST-MENTIONED MEANS TO CONVERT THEIR RESPECTIVE RESPONSES INTO A MEASURE OF INTERFACE RESISANT, MEANS FOR ENERGIZING SAID SECOND CONTROL WINDING MEANS IN ACCORDANCE SUBSTANTIALLY WITH CHANGES IN SAID MEASURE OF INTERFACE RESISTANCE TO EFFECT RESPONSIVE AMPLIFICATION BY SAID CONTROL AMPLIFER OF THE ENERGY THE LATTER SUPPLIES TO SAID FIRST CONTROL WINDING MEANS AND THEREBY TO VARY THE CURRENT AT SAID OUTPUT TERMINALS OF SAID FIRST AMPLIFER SUBSTANTIALLY INVERSELY TO INTERFACE RESISTANCE CHANGES, FREQUENCY-RESPONSIVE MEANS ELECTRO-RESPONSIVELY INTER-RELATED WITH SAID INTERFACE OF RESPONSIVE TO ELECTRICAL FLUCTUATIONS AT THE INTERFACE OF FREQUENCY VALUES CAUSED BY INCIPIENCE OF ARCING OR SPARKING ACROSS THE INTERFACE, AND MEANS CONTROLLED BY SAID FREQUENCY RESPONSIVE MEANS FOR LIMITING CURRENT OUTPUT AT SAID TERMINALS TO A VALUE JUST SHORT OF ARC-OVER OR SPARKING AT SAID INTERFACE.