Cutting apparatus and contact position specifying program

A cutting apparatus comprising:

• a rotation mechanism that rotates a spindle to which a cutting tool or to-be-cut object is attached;
• a feed mechanism that moves the cutting tool relative to a target object;
• and
• a controller that controls rotation of the spindle by the rotation mechanism and relative movement of the cutting tool by the feed mechanism, wherein
• the controller has a capability of acquiring a coordinate value when the cutting tool is moved relative to an object having a known shape to bring a cutting edge of the cutting tool into contact with a portion having the known shape of the object using detection information of a contact sensor or time-series data of a detection value related to a drive motor included in the rotation mechanism and/or the feed mechanism, and
• the controller obtains, based on coordinate values when the cutting edge of the cutting tool comes into contact with the portion having the known shape of the object at least at three positions, at least one of a nose radius of the cutting edge of the cutting tool, center coordinates of the cutting edge of the cutting tool, and an error in shape of the cutting edge of the cutting tool.

A cutting apparatus comprising:

• a rotation mechanism that rotates a spindle to which a cutting tool or to-be-cut object is attached;
• a feed mechanism that moves the cutting tool relative to the to-be-cut object;
• and
• a controller that controls rotation of the spindle by the rotation mechanism and relative movement of the cutting tool by the feed mechanism, wherein
• the controller has a capability of using detection information of a contact sensor or time-series data of a detection value related to a drive motor included in the rotation mechanism and/or the feed mechanism to acquire a coordinate value when a cutting edge of the cutting tool comes into contact with the to-be-cut object, and
• the controller specifies, based on coordinate values when the cutting tool is moved relative to the to-be-cut object subjected to cutting work by a feed capability of the feed mechanism in a movement direction not used for the cutting work to bring a cutting edge of the cutting tool into contact with the to-be-cut object at least at two positions, at least one of an attachment error of the cutting tool, an error in shape of the cutting edge of the cutting tool, and a deviation in the movement direction of the cutting tool relative to the to-be-cut object.

A cutting apparatus comprising:

• a rotation mechanism that rotates a spindle to which a cutting tool or to-be-cut object is attached;
• a feed mechanism that moves the cutting tool relative to the to-be-cut object;
• and
• a controller that specifies a contact position between the cutting tool and the to-be-cut object from time-series data of a detection value related to a drive motor included in the rotation mechanism and/or the feed mechanism, wherein
• the controller specifies the contact position based on first time-series data of a detection value acquired before contact and second time-series data of a detection value acquired after contact, the second time-series data containing a detection value greater than a predetermined threshold.

A cutting apparatus comprising:

• a rotation mechanism that rotates a spindle to which a cutting tool or to-be-cut object is attached;
• a feed mechanism that moves the cutting tool relative to the to-be-cut object;
• and
• a controller that specifies a contact position between the cutting tool and the to-be-cut object from time-series data of a detection value related to a drive motor included in the rotation mechanism and/or the feed mechanism, wherein
• the controller specifies the contact position based on an average value of first time-series data of a detection value acquired before contact and a regression equation obtained by regression analysis of second time-series data of a detection value acquired after contact.

A cutting apparatus capable of determining a relative positional relationship between a cutting edge of a cutting tool and a rotation center of a to-be-cut object, the cutting apparatus comprising:

• a rotation mechanism that rotates a spindle to which the to-be-cut object is attached;
• a feed mechanism that moves the cutting tool relative to the to-be-cut object or the spindle;
• and
• a controller that controls rotation of the spindle by the rotation mechanism and relative movement of the cutting tool by the feed mechanism, wherein
• the controller has a capability of using detection information of a contact sensor or time-series data of a detection value related to a drive motor included in the rotation mechanism and/or the feed mechanism to acquire a coordinate value when the cutting edge of the cutting tool comes into contact with a peripheral surface of the spindle, and
• the controller determines the relative positional relationship between the cutting edge of the cutting tool and the rotation center of the to-be-cut object based on coordinate values when the cutting edge of the cutting tool comes into contact with the peripheral surface of the spindle whose relative positional relationship with the rotation center of the to-be-cut object is known at least at two positions different in rotation angle position.