Tool radius adjusting system for boring holder, tool radius adjusting method in machine tool, and machine tool

A tool radius adjusting method in a machine tool comprising:

• a boring holder provided with a housing and a movable body supported in the housing slidably relative to the housing in a direction intersecting a rotational axis of the boring holder, the movable body having a reference portion;
• a tool tip attached to the movable body;
• a holder support for supporting the boring holder in a tool standby area which is out of a machining area of the machine tool;
• a position adjusting reference member provided in the tool standby area and being contactable with the reference portion of the movable body;
• and
• a drive mechanism for effecting relative movement between the holder support and the position adjusting reference member;
• the method comprising:
• a contact step of sliding the movable body relative to the housing to place the position of the tool tip at a predetermined position in a direction to go away from the rotational axis and of operating the drive mechanism to bring the reference portion of the movable body into contact with the position adjusting reference member with the tool tip placed at the predetermined position relative to the housing;
• and
• an adjusting step of adjusting the position of the tool tip relative to the rotational axis by moving the relative position between the housing and the position adjusting reference member in a direction to come close to each other after the contact step;
• wherein all of the steps are performed in the tool standby area.