A processing method for brittle plate using a processing apparatus for brittle plate, including:
- a table which holds the brittle plate,
- a processing head having a processing wheel for processing an outer peripheral edge of the brittle plate held by the table,
- a measuring portion which measures a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, and
- a control portion which corrects a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate,
- the measuring portion including:
- a mounting plate,
- a moving base provided capable of relative movement with respect to the mounting plate in a first direction orthogonal to the axis of the processing wheel,
- a moving portion for moving the moving base in the first direction, and
- a rotating portion provided on the moving base and having a shaft member including a distal end portion, and
- the processing method for brittle plate, comprising:
- a positioning process of positioning the shaft member to a predetermined position,
- a first measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in a first rotating direction around a shaft thereof and of measuring a first position on the processing surface of the processing wheel with which the distal end portion is brought into contact,
- a second measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in a second rotating direction which is a direction opposite to the first rotating direction and of measuring a second position on the processing surface of the processing wheel with which the distal end portion is brought into contact,
- a calculating process of calculating a first distance in the axis direction of the processing wheel from a predetermined processing reference position to the first position, of calculating a second distance in the axis direction of the processing wheel from the predetermined processing reference position to the second position, and of calculating the positional shift amount in the axis direction of the processing wheel on the basis of the first distance and the second distance,
- a correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and
- a processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process the outer peripheral edge of the brittle plate.