Patent ID: 8162722

Claim:
A grindstone contact sensing method of sensing the contact of the honing grindstone with the inner circumference of the work in a honing machine for honing an inner circumference of a work by moving the honing tool provided with a honing grindstone reciprocally in the direction of the axial line of the inner circumference of the work, rotating about the axial line, and moving the honing grindstone at a specified depth of cut by mechanical driving means, wherein a servo motor for driving the spindle rotation, and a servo motor for driving the depth of cut are provided and used respectively as a spindle rotation drive source for rotating and driving the spindle having the honing tool and a depth-of-cut drive source for moving the honing grindstone at a specified depth of cut, and the contact position of the honing grindstone with the inner circumference of the work is sensed from various electrical information obtained from both the servo motors.