Assured performance

High-speed spindles from GMN are designed for extremely high machining speeds in machining. Their performance profile is for maximum key speed values which achieve the outstanding smoothness.

Spindle vibrations due to imbalance

Unbalanced weight distribution of rotating parts (spindle shaft, tool) create increasing, sinusoidal imbalance vibrations as speed increases, and can affect the quality of the targeted machining results.


Highest machining quality during the production of GMN spindle shafts ensures precise mass distribution and minimal unbalance vibrations at maximum speeds.


In particular, speed-intensive production processes require an imbalance test and, if necessary, a balancing of the production-relevant tools in order to ensure the maintenance of oscillation tolerances.

Precision machining has established long-term and comprehensive practical experience for imbalance vibrations, which provide maximum performance from the use of GMN spindles.

Information about the illustration:


  • Valid for short tools
  • Better balancing may be necessary with long, cantilevered tools and high quality demands for the process
  • Also valid for spindles with abrasive mandrel holders (with comparable flat position diameters)
Permissible residual imbalance 

Spindle vibrations caused by own frequencies

The own frequencies of rotating systems cause critical speeds in which extreme vibrations can occur.
The use of different tools can reduce the critical speed range of the spindle tool system, leading to a reduction in the optimum speed required for machining.

Maximum speed: Spindle 
Maximum RPM: Spindle-tool system 

Calculating vibration

GMN offers a calculation of the static and dynamic behavior of the supplied spindle tool system under operating conditions for using tools with exceptional dimensions or high weight.

Professional analysis of the calculated results provides concrete indications in selecting spindles and to optimize the tool with consideration of load-dependent bending lines, stiffness, own frequencies and bearing loads.



Monitoring vibration

Vibration monitoring devices capture operating spindle movements and switch off disruptions at critical values in order to ensure the machine systems’ operational safety.

Recognizing wear-related vibrations in spindle bearings, provides additional preventive maintenance actions to ensure sustained machine run times.

One must ensure in selection and layout that vibrations which are caused by other machine components, must not enter into account.