MITUTOYO - Compact Roundness Measurement : ROUNDTEST RA-10 | JSR GROUP

Marketing JSR2 - December 08, 2025

Compact Roundness Measurement ROUNDTEST RA-10

Verification of geometrical tolerances, including roundness, is a must in today's quality-conscious environment.

Roundness measuring machines with the ability to perform product verification in conformity with ISO, JIS and other standards are indispensable to any quality control system that aspires to implementing high-grade quality assurance. Heightened awareness of production quality and higher quality goods will help enhance your corporate image with the buying public.

Roundness verification attempted using basic measuring tools involves the following drawbacks.

• Measurement is not conducted by a radiusmethod conforming to the standards, forwhich a reference axis is necessary.
• Measurement verification that meets theaccuracy required by the drawings cannot beperformed.
• Recorded profiles cannot be obtained.

Three-point method using an indicator and V-block has better resolution but is not sensitive to common lobing conditions.

• Reduction of nonconforming parts will translate into loweroverall cost of manufacture.
• Product quality will improve and the time-to-market for newproduct will be reduced.
• Corporate image will be enhanced.

High-Precision Roundness Measurement

Simple, beginner-friendly operation

• The key layout is large and simple so is easy to view and easy to understand.
• One-shot setup recall function: Complex setups are stored in advance, ready for recall when required by one-key operation.
• Zero-setting function: The detector’s level can be set to zero (0) with one single key press. This relieves the user from the chore of meticulously positioning the detector.
• The operation handles for vertical direction (Z axis) and radial direction (X axis) adjustments have been positioned on the slider for best operability.
• Because setups can only be altered in administrator mode, the machine operator can be prevented from inadvertently changing settings.

High accuracy even though a low-end machin

Despite being a low-priced model, the turntable with air bearings offers rotational accuracy as high as (0.04+6 H/10000) μm, thus assuring a precision that compares well to that of high-end models.

Large LCD panel displays measurement results and recorded profiles in an easy-to-view fashion

The built-in high-grade thermal printer prints out measurement results and recorded profiles on demand

Compact design means small installation space

The machine calls for only a small installation space as its compact body integrates the measuring unit, electronics and printer.

Options that further enhance usability

Use of a part setting jig exactly fitting the object being measured eliminates the need for the centering and leveling adjustments which would otherwise be required prior to measurement. An X-axis stop in the radial direction allows the detector to be positioned easily according to the object to be measured, eliminating the task of fine positioning when measurement is repeated.

Clamp the workpiece to the jig.

Bring the detector into contact with the workpiece.

*Combined use of the zero-setting function and X-axis stop (Optional) will result in securing even higher efficiency when identical workpieces are measured repetitively

Press the [CONDITION (setup recall)] button, as needed.

*If measurement is always conducted using the last setup, there is no need to recall this because the machine always starts up with the same settings that were effective immediately before the machine was powered down last time.

Press the [START] button.

Main Measuring Unit

Detector

Allows simple positioning of the workpiece due to its wide measuring range of ±1000 μm.

Part setting jig (Optional)

Can be selected to best suit the workpiece, which can be clamped/ released in a single action. High regripping accuracy eliminates the need for centering and leveling.

High-precision air bearings

The highest accuracy in its class, (0.04+6H/10000) μm, has been achieved

Built-in printer

Prints measurement results.

Space-saving design

The compact body integrating the measuring unit, electronics and printer poses no problem in installing the machine

Z-axis ABS scale (Optional)

When the ABS scale is fitted, positioning in the Z-axis (vertical) direction is performed with higher accuracy.

Slider

Carries the manual operation knobs positioned together for convenient X and Z-axis stylus position adjustment

Large LCD panel

Clearly displays measurement results and recorded profiles.

Simple operation panel

Large-sized buttons allow easy recall of stored measurement setups and help prevent input errors.

High-precision air bearings provide highly accurate measurement

Measurement results can be sent to the built-in printer or exported for external processing and storage

Turntable axis stability is the most critical specification of a roundness measuring machine since this axis provides the datum from which the stylus deflection is measured for every type of analysis. For this reason the RA-10 is equipped with specially designed air bearings that assure high rotational accuracy to guarantee high-precision measurements. As these bearings are inherently non-contacting they are free of any degradation arising from normal use, so the machine retains high accuracy even when used for an extended period of time.

Measurement results and recorded profiles can be sent to the highgrade built-in thermal printer or exported via the SPC and RS-232C output functions or text file output function to USB memory

e output function to USB memory

Control Panel

Measurement screen / Result screen switching

Switches between measurement screen and analysis result screen at one touch of a button.

Printer control

While automatic print is available, setting can also be made to print desired results only, thus resulting in the saving of paper resources.

Zero Set button

A potent tool for establishing optimum positioning of the detector.

Setup button

Simplified communication program for ROUNDTEST RA-10

The Roundtest RA-10 has a USB interface, enabling data to be transferred to a spreadsheet or other software.

Supports 16 languages

Japanese, English, German, French, Italian, Spanish, Portuguese, Korean, Traditional Chinese, Simplified Chinese, Czech, Polish, Hungarian, Turkish, Swedish, Dutch

Large LCD screen

Displays measurement results and recorded profiles in an easy-to understand manner.

Setup Recall

Frequently used measurement setups can be stored in advance, ready to be called up by one touch of a button.

Setup definition

Measuring range switching

Sample Measurement Screen

Sample Result Screen (Roundness)

Useful functions help setting up prior to measurement		Limaçon function compensates for eccentricity
When a high-resolution range measurement is needed, for which accurate positioning is required, the Zero Set button allows the detector to be set at the optimum position. The machine delivers the measurement results for a workpiece after automatically correcting for eccentricity and inclination.		A displacement offset between the turntable axis and that of the part under measurement results in distortion of the measured form (limaçon error) and consequentially produces an error in the calculated roundness value. The larger the eccentricity, the larger is the error in calculated roundness.The RA-10 supports accurate measurement with a limaçon error correction function, which is provided to correct such errors arising from eccentricity.
Measurement data editing function
Any part of a profile that is not to be included in the calculation can be automatically excluded from the measurement data. Therefore notches in the profile can be ignored, or data produced by scratches can be deleted while observing recorded profiles on the screen.		Notes: 1. The limaçon error correction is effective only when measuring a workpiece of larger diameter than that of the tip of the probe. 2. If the effect obtained with the limaçon error correction function is not sufficient, use the optional alignment table (to be purchased separately) to establish precise centering of the workpiece.