Device for gear cutting, tool head and gear cutting machine

A device for machining a gear using a rotating machining tool having a first end and a second end, the device comprising:

• a motor spindle having a drive motor and a motor spindle shaft drivable by the drive motor, the motor spindle being configured to generate a rotation of the motor spindle shaft about a tool axis, wherein the motor spindle shaft is configured to be connected to the machining tool at the first end thereof for driving the machining tool to rotate about the tool axis,
• wherein the device is configured as an auxiliary spindle unit for releasable attachment to a work spindle of a tool head, the work spindle being configured to generate a rotation of a work spindle shaft about a work spindle axis to drive the machining tool or another tool to rotate about the work spindle axis,
• wherein the device comprises an attachment structure configured for releasably attaching the device to the work spindle,
• wherein the motor spindle is connected to the attachment structure, and
• wherein the attachment structure is configured such that the tool axis is parallel to the work spindle axis when the device is attached to the work spindle of the tool head.