This surely sounds familiar: Often the obstacle in complete machining is the absence of a good workholding device that is able to clamp on inside of a work piece. A jaw-chuck offers only limited help and mandrels currently on the market leave a lot to be desired regarding accuracy, rigidity, stroke and usability.

Unless of course you are using HAINBUCH segmented mandrels stationary. They use state-of-the-art clamping technology that is convincing, even in the most critical applications.