Constant surface speed machine tool

Claim 1

IN A MACHINE TOOL, A MOTOR FOR EFFECTING ROTATION OF A WORKPIECE RELATIVE TO A TOOL, MEANS SUPPORTING SAID TOOL AND WORKPIECE FOR RELATIVE MOVEMENT TRANSVERSELY OF THE AXIS OF ROTATION OF THE WORKPIECE AND INCLUDING A SLIDE MOVABLE ALONG A PATH TO EFFECT SAID RELATIVE MOVEMENT, MEANS FOR MOUNTING SAID TOOL IN A REFERENCE POSITION WITH RESPECT TO SAID SLIDE IN WHICH THE POSITIONS OF SAID SLIDE ALONG SAID PATH CORRESPONDS TO A CORRESPONDING PREDETERMINED DISTANCE OF SAID TOOL FROM THE AXIS OF ROTATION, SAID TOOL BEING OFFSETTABLE FROM SAID REFERENCE POSITION, A CONTROL CIRCUIT FOR CONTROLLING THE SPEED OF SAID MOTOR, SAID CONTROL CIRCUIT HAVING INPUT TERMINALS, INPUT CIRCUIT MEANS COMPRISING A REFERENCE VOLTAGE SUPPLY CONNECTED TO SAID TERMINALS TO APPLY A SIGNAL VOLTAGE OF A SENSE TO INCREASE THE SPEED OF SAID MOTOR, ELECTRICAL MEANS PROVIDING AN OUTPUT VOLTAGE DEPENDENT ON MOTOR SPEED AND MEANS CONNECTING SAID ELECTRICAL MEANS TO SAID INPUT TERMINALS IN OPPOSITION TO SAID REFERENCE VOLTAGE INCLUDING A VOLTAGE DIVIDING CIRCUIT INCLUDING A FIRST VARIABLE ELEMENT HAVING A MOVABLE CONNECTION INTERMEDIATE THE TERMINALS THEREOF, SAID MOVABLE ELEMENT BEING CONNECTED TO ONE OF SAID INPUT TERMINALS FOR APPLYING VARYING PORTIONS OF SAID OUTPUT VOLTAGE TO SAID INPUT TERMINALS AND A SECOND VARIABLE CIRCUIT ELEMENT FOR VARYING THE PORTION OF SAID OUTPUT VOLTAGE APPLIED TO SAID INPUT TERMINALS, MEANS CONNECTING SAID SLIDE TO VARY SAID FIRST VARIABLE ELEMENT AS SAID SLIDE MOVES MOVES ALONG SAID PATH, AND MEANS FOR VARYING SAID SECOND VARIABLE ELEMENT IN ACCORDANCE WITH THE MAGNITUDE OF THE OFFSET OF SAID TOOL FROM SAID REFERENCE POSITION.