Temperature-Compensated Stationary Dynamometer

Winterthur, 25 August 2015 – Kistler is adding a new member to its family of horizontally pretensioned stationary dynamometers: the Type 9139AA dynamometer. This instrument measures forces in the cutting process with outstandingly high signal quality, so it opens up various possibilities: accurate analysis of cutting processes or machining strategies, and optimization of auxiliary equipment such as cutting tools. The successor model to Type 9265B features a compact and extremely rugged structural design as well as a wide measuring range of 30 kN in all three directions. Even at high spindle speeds, the dynamometer's high natural frequency allows accurate analysis of the cutting process. The patented design with horizontal pretensioning largely eliminates the negative impact of heat that is typically generated during the cutting process, so signal drift is minimized. The wide force range makes the Type 9139AA ideal for high-performance cutting.

Cutting Processes: Analysis and Optimization
Type 9139AA is used for accurate analysis of highly dynamic cutting processes. High-precision measurements of all forces occurring provide a sound basis for users to optimize cutting processes, machining strategies, cutting tools and auxiliary equipment (such as coolants). Of course, Kistler's latest dynamometer is also suitable for verifying simulations. Type 9139AA is specifically designed for milling applications and flat grinding with high removal rates and correspondingly high forces. But this dynamometer can also be used for drilling, other cutting applications and force measurements in general. The Type 9139AA dynamometer will replace the existing Type 9265B.

Rugged Structural Design for High-Performance Cutting
Following on from Types 9129AA and 9119AA, Type 9139AA is the third stationary dynamometer in Kistler's family of horizontally pretensioned dynamometers. This model features a compact design and a wide measuring range of 30 kN in all three directions. An exceptionally rugged structure and a wide force range make Type 9139AA ideal for high-performance cutting.

Precise Measurements at High Spindle Speeds
Natural frequency was a key issue in Kistler's development work on the Type 9139AA. Extensive FEM analyses were carried out to optimize the design and structure so that natural frequencies of about 3 kHz are achieved despite the dynamometer's size. This minimizes negative dynamic impact on the measurement signals – so cutting processes are captured accurately even at high tooth passing frequencies.

Patented Design Minimizes Signal Drift
The thermal energy generated during the cutting process usually causes undesirable signal drift. Kistler's Type 9139AA, 9129AA and 9119AA dynamometers feature a patented design with horizontal pretensioning that largely eliminates these negative influences. The result: even processes that generate large amounts of heat or those with thermal differences can be captured accurately.

Workpieces are Simple to Mount
The large number of threaded holes make it simple to mount workpieces on the Type 9139AA. Mounting the dynamometer on the machine table is equally straightforward. The Type 9139AA dynamometer is based on the Fischer flange connector concept that is in widespread use, with the same pin assignment as all Kistler's other stationary dynamometers. It is easy to replace the measuring platform, and the existing cables and charge amplifiers can be used again.

You can find more information on this product and Kistler's solutions for cutting force measurements here.

Download Press Release (PDF)

User Contact
Manuel Blattner
Head of Business Field Cutting Force
Phone +41 52 224 12 73
E-mail: manuel.blattner(at)kistler.com

Media Contact
Tabea Zuberbühler
Media Coordination
Phone +41 52 224 12 74
E-mail: tabea.zuberbuehler(at)kistler.com

Image caption: The Kistler Type 9139AA is used to analyze dynamic cutting processes in order to optimize processes, machining strategies, and tools.

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