Kawasaki improves its roundness quality with Mitutoyo.

Tecnology: Mitutoyo Roundtest Extreme
Sector: Automotive


The Precision Machinery division of Kawasaki has been at the forefront of hydraulic technology and development for nearly 50 years. The Kawasaki brand is synonymous with quality and innovation in hydraulic pumps, motors, valves and complete systems across the whole spectrum of applications. Its previous roundness tester in need of replacement.

Kawasaki Precision Machinery in UK (KPMUK) is the centre for Sales, Engineering and Manufacturing for Kawasaki hydraulic components and systems, including the world-famous Staffa radial piston motor, for Europe, the Middle East and Africa.

For more than six decades the Staffa name has been synonymous with radial piston hydraulic motors, the motors’ hydraulically balanced construction combined with Kawasaki’s no-compromise approach to quality result in excellent levels of reliability and performance.

As the pistons and cylinders and other ‘round’ parts of Staffa products have extremely challenging dimensional tolerances, KPM UK recently searched for a roundform system that could enable attributes, including roundness, straightness, flatness, concentricity, coaxiality, perpendicularity and runout to be measured to extremely demanding levels of accuracy. The answer to KPM UK’s needs was found in a top of the range Mitutoyo Roundtest Extreme RA-H5200CNC, CNC Roundness Tester / Cylindricity Measuring System.


Mitutoyo offers a wide range of high-quality instruments for measuring round form geometry on the shop floor, quality control room or laboratory. Mitutoyo’s Roundtest is a sophisticated, highly accurate system capable of both form and surface finish measuring. A linear scale incorporated into Roundtest machines’ X-axis, enables measurement to be taken while tracking the workpiece surface. This capability is most effective when measuring a diameter difference involving a displacement that exceeds the detection range of the probe, or a taper that can only be measured with a slider/column movement. Semi-automatic centering and levelling of the workpiece on the air-bearing equipped turntable, via the AAT system, helps ensure easy setups. Whilst Mitutoyo’s powerful ROUNDPAK analysis software completes the comprehensive package.

The top of the range Mitutoyo Roundtest ExtremeRA-H5200CNC, CNC Roundness/Cylindricity Measuring System, as purchased by KPM UK, is an innovative measuring systems capable of automated measurement with independent/simultaneous multi-axis CNC control.

In addition to delivering outstanding measuring accuracy and reliability, Mitutoyo’s CNC models also provide excellent inspection throughput. Roundness and surface roughness measurements are both available from a single measuring system therefor workpiece resetting for roughness measurement is not required. In addition, roughness measurement is possible in the axial and circumferential directions.

Mitutoyo’s top of the range system boasts a turntable rotational accuracy of radial: (0.02+3.5H/10000) μm and is capable of measuring roundness,cylindricity, concentricity, coaxiality, axis-element, axis-axis, flatness, parallelism, perpendicularity, runout, total runout, straightness, inclination and taper.

Mitutoyo’s Roundpak software includes an off-line measurement procedure programming function. On-screen, virtual 3D simulation measurements can be performed with an integrated off-line teaching function that allows a part program to be created without an objective workpiece.

The probe and the holder unit of the Roundtest Extreme can be accurately represented in the simulation making the prediction of collision risks and warning alarms possible.

3D simulation screens (work-view windows) can be generated after entering CAD data (in IGES, DXF form) and text data.