Method and apparatus for displacing a honing tool

A method of displacing a honing tool having stones for stock removal in workpiece bores, including the steps of initially rapidly feeding said tool until the latter contacts the workpiece, and then changing over to a slower stock removal feed step;

• the improvement therewith which comprises in combination the steps of:
• effecting said rapid feeding and said stock removal feed by means of a single motor employed during said rapid feeding and said stock removal feed;
• presetting the rapid feeding speed, the stock removal feed speed, and a respective torque limit of said motor;
• introducing said honing tool into said workpiece bore, thereupon rapidly feeding the honing stones of said tool with feeding means, and in so doing operating said single motor of a continuing feed at high speed and low torque limit in conformity with said preset values;
• turning said single motor off when said honing stones come to rest against the wall of said workpiece bore, and when said preset torque limit of said single motor is reached;
• after said honing stones come to rest against said bore wall and said single motor is shut off, temporarily changing the direction of rotation of said single motor and slightly backing off said honing stones from said bore wall;
• after the conclusion of said backing-off step, automatically initiating a stroke motion of said honing tool, tool rotation and stock removal feeding, which pursuant to said presetting operates at a low stock removal feed speed and high torque limit;
• after achieving a predetermined finished size value, stopping said stock removal feeding, and briefly rotating said single motor in the opposite direction in order to back-off said stock removal feeding by a predetermined amount;
• inputting into a first input element a stock removal feeding value which in conformity with the stock removal task is necessary for the first of a series of workpieces which are to be machined;
• upon achieving this feeding value stopping said stock removal feeding;
• and storing the thusobtained position in a feed control mechanism as the finished size value;
• inputting, into a second input element of said feed control mechanism, a previously determined honing stone wearvalue which is related to a machined workpiece;
• and adding this value, in said feed control mechanism, to said finished size value to form a new finished size value, which is then stored;
• operating said feed control mechanism via pulses;
• successively inputting into a position cycle regulator, for said stock removal feeding, one pulse at a time;
• and
• utilizing said pulse in such a way that with each pulse, said single motor is rotated further by a specific angular step, thus operating said single motor also as a quasi stepping motor particularly during said stock removal feeding.