Toolholder

A programmable toolholder, the toolholder being mounted in a tool rest of a machine tool, the toolholder having a rotary axis and a rotation axis being programmable to move to a specified position in synchronization with a movement of one of at least three mutually perpendicular linear axes, the toolholder comprising:

• a tool spindle for retaining the toolholder in the tool rest;
• an adaptor for supporting a cutting tool retained in the adaptor by a clamp, the cutting tool defining a lead angle between a leading edge of the cutting tool and a workpiece and a trailing angle between a trailing edge of the cutting tool and the workpiece,
• wherein one of the lead angle and the trailing angle remains constant by controlling the movement of one of the rotary axis and the rotation axis with respect to the workpiece independently of the movement with respect to the at least three mutually perpendicular linear axes, while at least one movement vector of the at least three mutually perpendicular linear axes is changed, and
• wherein the lead angle of the cutting tool is used to anticipate interference between the cutting tool and the workpiece.