Cutting force measurements with rotating dynamometers (RCD) from Kistler

Rotating dynamometers with near field telemetry and piezo technology

Rotating dynamometers have the advantage of a rugged and compact design that makes handling easy. They are mounted directly via the machine spindle interface. The tool is then connected to the RCD with the help of a suitable tool holder. The RCD rotates with the spindle during operation, so the mechanical load on the tool can be quantified directly. We offer you an extensive choice of spindle adapters that open up a varied range of potential applications.

Drilling and milling with rotating dynamometers (RCD) by Kistler

Piezoelectric dynamometers display their advantages to the full in milling and drilling operations. Thanks to their high rigidity and natural frequencies, these dynamometers cope easily with high tooth passing frequencies to deliver measurement results with a precision level that other technologies cannot achieve.

Optimizing machining technology

Part quality, tool life and machining time depend on different factors. Because rotating dynamometers with cables measure the cutting forces with high precision, they provide the basis needed to assess and optimize all these factors. They include:

  • wear mechanisms
  • identification of overload situations
  • cooling and lubrication
  • material characteristics
  • workpiece clamping characteristics
  • vibrations and oscillations around the machine
  • no-load operation


The compact model: RCD Type 9170A

The Type 9170A rotating dynamometer (RCD) is the compact member of Kistler's family of rotating systems. Designed for applications in milling and drilling processes, this model was specifically developed for high-precision machining at speeds of up to 20 000 1/min. 

Because of its compact structure, the rotating dynamometer with cable is highly rigid – so its natural frequency is also very high. Thanks to these advantages, the Type 9170A achieves the very high resolution needed to measure as many as 600 edge engagements per second. 

Kistler offers you an extensive portfolio of standard commercial machine interfaces.

When placing your order, choose the machine interface you need to measure the cutting forces for your type of machining. On the tool side, the ER32 collet chuck is available as standard. Please note that you cannot replace or exchange the adapters of the 9170A due to its integrated design.

Kistler offers a wide range of standard commercial machine interfaces for the Type 9170A rotating dynamometer (RCD).

Capto is a registered trade mark of the Sandvik Group

The versatile choice: RCD Type 9171A

Do you operate machine tools with different spindle interfaces?

If so, we offer you an extensive choice of spindle adapters for our  Type 9171A rotating dynamometer (RCD). These adapters can be exchanged on the tool side as well as the machine side. They open up a variety of options to adapt the RCD flexibly to each individual measurement task.

Our Type 9171A rotating cutting force measurement system (RCD) rotating cutting force measurement system (RCD) is suitable for medium to heavy machining operations in a speed range up to 12,000 rpm. Thanks to the interface for attaching tool-side adapters, you can even develop your own specific tool systems for use together with the RCD.

You can choose from a vast range of machine interfaces and spindle adapters for the Type 9171A rotating dynamometer (RCD).

Capto is a registered trade mark of the Sandvik Group

PowRgrip and SecuRgrip are registered trade marks of Rego-Fix AG

MEGA New Baby Chuck is a registered trade mark of BIG DAISHOWA Group

TENDO is a registered trade mark of the Schunk Group

Measuring chain for rotating dynamometers with RCD, signal and data transmission, signal conditioner, DAQ and software

Flexible wireless data transmission

Transmission of measurement data and the energy supply for the Type 9170A and 9171A rotating cutting force measurement systems (RCD) are handled by wireless near-field telemetry in conjunction with a signal conditioner. The signal conditioner, which is compatible with both measurement systems, automatically detects which rotor is being used and adapts the relevant settings automatically.

Straightforward data acquisition and evaluation

Data is acquired via hardware in combination with the DynoWare software, software, so three different measurement ranges and low-pass filters can be set. The individual measuring ranges for axial forces and torque can also be selected independently of one another. The benefit: optimum utilization of the measurement ranges. As regards signal analysis, DynoWare offers measurement engineers real-time visualization of measurement curves as well as helpful calculation and graphics functions.

Max 25 MB