Form Measurement

Compact Roundness Measurement

ROUNDTEST RA-10

Catalog No.E15019(2)We have a reason for proposing you introduce
roundness measuring machines to your business.

High-Precision Roundness Measurement

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

Simple, beginner-friendly operation

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 toimplementing high-grade quality assurance. Heightened awareness of production quality andhigher quality goods will help enhance your corporate image with the buying public.

• 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 machine
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 aprecision that compares well to that of high-end models.

Roundness verification attemptedusing basic measuring tools involves
the following drawbacks:

Large LCD panel displays measurement results and recorded profiles inan easy-to-view fashion• Measurement is not conducted by a radius
method conforming to the standards, forwhich a reference axis is necessary.
• Measurement verification that meets theaccuracy required by the drawings cannot be
performed.
• Recorded profiles cannot be obtained.

The built-in high-grade thermal printer prints out measurement results
and recorded profiles on demand
Diameter measurement using a
micrometer cannot detect an oddnumber lobing condition and resolution
is marginal.

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

Compact design means small installation space
The machine calls for only a small installation space as its compact body integrates themeasuring unit, electronics and printer.

Options that further enhance usability
Use of a part setting jig exactly fitting the object being measured eliminates the needfor 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 thetask of fine positioning when measurement is repeated.

Once roundness measuring machines are
introduced into quality control:* For details on the options, see pages 3 and 8.

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

Four easy steps to measurement

Definition of RoundnessfRoundness of a profile or contour (C) is the difference in radius (f)of two concentric circles that enclose
C when the separation of these circles C
is a minimum, and is indicated as‘roundness xx mm’ or
Rmin‘roundness xx μm’.
Rmax

Clamp the workpieceto the jig.

Bring the detector
into contact with theworkpiece.
*Combined use of the zero-setting function andX-axis stop (Optional) will result in securing evenhigher efficiency when identical workpieces aremeasured repetitively.

2

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

Press the [START]
button.

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

3

Main Measuring Unit

Control Panel

Detector

Z-axis ABS scale (Optional)

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

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

Part setting jig (Optional)

SliderCan be selected to best suit theworkpiece, which can be clamped/
released in a single action. High regripping accuracy eliminates the needfor centering and leveling.

Carries the manual operation knobs
positioned together for convenient Xand Z-axis stylus position adjustment.

High-precision air
bearings

Large LCD panel
Clearly displays measurement results andrecorded profiles.

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

Supports 16 languages
Japanese, English, German, French, Italian,
Spanish, Portuguese, Korean, Traditional
Chinese, Simplified Chinese, Czech, Polish,
Hungarian, Turkish, Swedish, Dutch

Measurement screen / Result
screen switching
Switches between measurement screen
and analysis result screen at one touchof a button.

Large LCD screen
Displays measurement results andrecorded profiles in an easy-tounderstand manner.

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

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

Zero Set button

Setup definition

A potent tool for establishing optimum
positioning of the detector.

Measuring range switching

Setup button

Built-in printerSimple operation panel

Prints measurement results.

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

Space-saving design
The compact body integrating the measuring unit, electronics andprinter poses no problem in installing the machine.

Simplified communication program for ROUNDTEST RA-10
The Roundtest RA-10 has a USB interface, enabling data to be transferred toa spreadsheet or other software.
Measuring posture
Measuring height
Comment input

Tolerance
Number of measured cross-sections(Max. 5)High-precision air bearings provide highly accurate
measurement

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

Turntable axis stability is the most critical specification of aroundness measuring machine since this axis provides the datum
from which the stylus deflection is measured for every type ofanalysis. For this reason the RA-10 is equipped with speciallydesigned air bearings that assure high rotational accuracy toguarantee high-precision measurements.
As these bearings are inherently non-contacting they are free of any
degradation arising from normal use, so the machine retains highaccuracy 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.

Rotational accuracy (µm)

Graph of rotational accuracy versus height above table surface.
0.14
0.12

Display magnification

FilterCutoff

0.08
0.04
0.02
0

20

100
60
80
40
Measuring height (mm)120

Cutoff

Filter

Display magnification

Calculation method

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 thedetector 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 thepart under measurement results in distortion of the measured
form (limaçon error) and consequentially produces an error in thecalculated roundness value. The larger the eccentricity, the larger isthe error in calculated roundness.
The RA-10 supports accurate measurement with a limaçon error
correction function, which is provided to correct such errors arisingfrom eccentricity.

Measurement data editing function

0.06

Calculation method

Sample Measurement Screen

0.10

0.00

4

Sample print by built-in printerNotching conditions
None
Specified level
Specified angle

Displayed profiles
CircularDeveloped

Any part of a profile that is not to
be included in the calculation canbe automatically excluded fromthe measurement data. Therefore
notches in the profile can be ignored,
or data produced by scratches canbe deleted while observing recorded
profiles on the screen.

Notes:
1. T he limaçon error correction is effective only when measuring a workpiece oflarger diameter than that of the tip of the probe.
2. If 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.

5Types of Analysis with the RA-10

Optional Accessories

FeatureCharacteristic

Interchangeable Styli
12AAL021
Standard stylus

Roundness

Unit: mm

*Standard accessory(stylus tip: ø1.6 carbide ball)

12AAL022
Stylus for notched workpieces(stylus tip: ø3 carbide ball)
Useful for notched workpieces

For standard applications

52.5

In ID measurement
Dia.: ≥7.5mm, Depth: ≤50 mm

12AAL024
Stylus for corners (stylus tip: R0.25 sapphire)
For inside-corner applications

For stepped applications

ø4

ø4

66

66

ø4

Example52.5

Roundness (MZC)
Roundness (MZC definition) of a profile is the difference inradius of two concentric circles that enclose the profile when theseparation of these circles is a minimum.

12AAL023
Stylus for grooves (stylus tip: R0.25 sapphire)ø466

Explanation

ExampleExample52.5

Sample Result Screen

66

Measurement Method

52.5

Characteristic
Symbol

30°

Form
5.5

For extra small hole applications
Dia.: ≥1 mm, Depth: ≤2.5 mm

Flatness of a profile is the distance between two planes enclosing
the profile when this distance is a minimum.

Enlarged image

Concentricity of a profile is twice the shortest distance between
the center of the profile and the datum.

ø1

ø0.5 carbide ball

66
52.5

66

40

18

10

ø0.6

ø1.5

ø0.8 carbide ball

12AAL027
12AAL032
Stylus for small holes (stylus tip: ø1 carbide ball) Cranked stylus (stylus tip: ø0.5 carbide ball)

ø1.2

ø3

ø1.6 carbide ball

12AAL033
Cranked stylus (stylus tip: ø1 carbide ball)

ø1.2
ø3
ø1.6 carbide ball

12AAL034
Stylus for flat surface
68

67.5

67.5

For small hole applications

Location

ø4

12

3

2.5

52.5

52.5

66

66

ø4

Enlarged image

ø4.5

20

Enlarged image

ø0.3

Concentricity

For small and deep hole applications
Dia.: ≥3 mm, Depth: ≤38 mm

For small and deep hole applications
Dia.: ≥3 mm, Depth: ≤18 mm

For small hole applications
Dia.: ≥1.5 mm, Depth: ≤10 mm

Enlarged image

ø4

Concentricity

12AAL028
Stylus for small and deep holes(stylus tip: ø1.6 carbide ball, L=40)

12AAL030
Stylus for small and deep holes(stylus tip: ø1.6 carbide ball)

12AAL026
Stylus for small holes(stylus tip: ø0.8 carbide ball)

12AAL029
Stylus for extra small holes(stylus tip: ø0.5 carbide ball)

7.5

52.5

Flatness

11.7

7

38

Flatness

5

ø4

66

5.5

ø4

66

2.5

Coaxiality

ø1 carbide ball

66

0.5

R1

ø4

ø2
ø0.5 carbide ball

52.5

66

ø4

Coaxiality
Coaxiality of the axis of a profiled surface is twice the shortest
radial distance between the axis and the datum at the measured
positions.

ø0.8

ExampleNote: This stylus cannot be
used for OD/ID measurement.

ø1 carbide ball

12AAL025
Stylus for filtering asperities (machining marks)

12AAL031
Disk stylus

12AAL043
M2 tapped shank for CMM styli

12AAL044
M2 tapped shank for CMM styli

Circular runout

R1

0.5

Machining marks

ø12

52.5

66
68.5

ø4

0.5

10
R 15

ø4

56

66

5°

ExampleFor narrow groove
applications

42.5

52.5

Exampleø2

Circular runout (radial) of a profile is the radial distance between
two circles enclosing the profile and concentric with the datum
when this distance is a minimum.

ø4

ø4

66

RunoutCompatible with CMM styli
with M2 threaded shankCompatible with CMM styli
with M2 threaded shank

Filtering out the effects ofasperities by tracing with R15
tipped stylus

52.5

Circular runout(radial)For upper/lower surface in a narrow groove

22.7

8.2°

ExampleM2 depth 5

M2

3.5

* portion shows stylus except for the cranked stylus and stylus for flat surface.
*Customized special interchangeable styli are available on request. Please contact any Mitutoyo office for more information.

6

7

Optional Accessories

Various Clamping Jigs

• Other accessories

For direct mounting on the turntable

X-axis stop

Centering chuck

Collet chuck

Order No.
211-052
Part holding range O.D. (Internal jaws) 1–36 mm
O.D. (External jaws) 25 – 79 mm
I.D. (Internal jaws) 16 – 69 mm
Centering error
Within 150 μm*1
Mass
2.5 kgOrder No.
Part holding range
Centering error
Mass

When measuring a small-sized workpiece, the chuckprovides good operability andthe knurled ring allows theworkpiece to be clamped easily.

Provides high clamping
repeatability due to the use of
optional precision collets.
(See table below.)

These collets are acquired to match
the workpiece diameter range
required.

211-051
O.D. ø0.5 –10 mm*2
Within 50 μm*3
1.4 kg*2: Optional collets to match the workpiece size range are required.
*3: When measured with ø5 mm pin gauge at measuring height of 30 mm.

*1: When measured with ø10 mm pin gauge at measuring height of 30 mm.

V-block jig A [Semi-custom product]

The cylindrical surface of the workpiece is held against
the V-block and secured with the screw-type clamp.
This is a semi-custom-made product (ø10 to ø100 mm)
that is shipped out after adjusting the position of the
V-block according to the workpiece size. This jig allows
workpieces of the same size
to be measured without
having to center each one.
211-053: for ø50 mm

Allows the user to returnthe detector rapidly andeasily to a fixed positionon the X axis.

Individual collets*4

V-block jig B [Semi-custom product]

The cylindrical surface of the workpiece is held against
the V-block and secured with the screw-type clamp.
This is a semi-custom-made product (ø10 to ø100 mm)
that is shipped out after adjusting the position of the
V-block according to the workpiece size. This jig allows
workpieces of the same size
to be measured without
having to center each one.

Order No.
12AAH402
12AAH403
12AAH404
12AAH405
12AAH406
12AAH407
12AAH408
12AAH409
12AAH410
12AAH411
12AAH412
12AAH413
12AAH414

Part Holding Range (O.D.)
ø0.5 – 1.0 mm
ø1.0 – 1.5 mm
ø1.5 – 2.0 mm
ø2.0 – 2.5 mm
ø2.5 – 3.0 mm
ø3.0 – 3.5 mm
ø3.5 – 4.0 mm
ø4.0 – 5.0 mm
ø5.0 – 6.0 mm
ø6.0 – 7.0 mm
ø7.0 – 8.0 mm
ø8.0 – 9.0 mm
ø9.0 – 10.0 mm

Order No.
Mass

12AAH320
65 g

SD scale for Z axis*

Vibration damping stand

Order No.
Mass

Order No.
211-013Vibration damping system Diaphragm type air spring
External size
615 × 515 × 51 mm
Max. loading
150 kgScale unit for accurate
positioning of the slider in
the Z-axis direction (ABSscale used).

12AAH318
450 g* Shipped out attached to the RA-10 machine, or will be installed onsite by Mitutoyo service personnel.

• 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.
We also provide a program that lets you create inspection record tables using a Microsoft Excel* macro.

*4: A collet cannot be mounted on the turntable without a collet chuck.

211-054: for ø50 mm

OD/ID mating jig [Semi-custom product]These jigs are specially made to locate plain sections of a workpiece so thatloading/unloading is very quick. Workpiece centering is automatically provided byjust one initial centering operation on the jig, when first installed, so measurement
can be started as soon as the jig is loaded with a workpiece. No clamping is used
so the workpiece must be heavy enough to remain stable during measurement.

211-055: for ø10mm*An OD/ID master mating part to match the workpiece diameter is required separately [(available to special
order (max. ø30 mm)].

Alignment table

Order No.
Centering adjustment range
Leveling adjustment range
Maximum loading
Mass

When installed on the turntable, this accessory enables theuser to efficiently perform centering and leveling adjustments
in synchronization with the adjustment Navi DAT.

12AAH425
±3 mm
±1 °
3 kg
7 kg

12AAH426±3 mm/.12”
±1 °
3 kg
7 kg

Required environment:• OS: Windows XP-SP3
Windows VISTA
Windows 7 (32bit/64bit)
Windows 10*With mechanical micrometer head type (12AAH427) is available.

Options that can be installed on the alignment table
Centering chuck (knurled ring operated)

When measuring a small-diameter workpiece, thechuck provides good operability and the knurled ringallows the workpiece to be clamped easily.
Order No.
Holding range
External size (D x H)
Mass

8

211-032
O.D. with internal jaws ø1– ø36 mm
I.D. with internal jaws ø16 – ø69 mm
O.D. with internal jaws ø25 – ø79 mm
ø118 × 41 mm
1.2 kg• Spreadsheet software: Microsoft Excel 2010, Microsoft Excel 2016
Note: Windows OS and Microsoft Excel are products of Microsoft Corporation.

Microchuck

For clamping a small workpiece, 1 mm or lessin diameter, that cannot be held in the centeringchuck.
Order No.
Holding range
External size (D x H)
Mass

211-031
O.D.: ø0.1– ø1.5 mm
ø107 × 48.5 mm
0.6 kgThe optional USB cable is also required.
• USB cable for RA-10 series
Order No. 12AAH490
Commercial item: Equivalent to USB Type A to B cableThis program can be downloaded for FREE from the Mitutoyo website.
https://www.mitutoyo.co.jp/eng/

9

Specifications

Dimensions

External dimensions

Filter type
Cutoff value
Electronic unit

Number of measuring sections
Reference circle for evaluation
Evaluation capability
Data output
Display
Printer
Display languages

OthersPower supply
Power consumption
Air pressure
Air consumption
Mass*1: Top position will vary depending on any attachments installed.
*2: No attachments installed.

323
50

25

400

Quantity
2 pcs.
1 pc.
1 pc.
1 pc.
2 rolls
1 pc.
1 pc.
1 pc.
1 pc.
1 pc.
1 pc. (0.9), 2 pcs. (2), 1 pc. (4)1 pc.
1 copy115

Installation floor plan
: Power inlet: Air inlet

Unit: mm
Four concentric grooves: W1xD0.5 (ø32, ø60, ø88, ø116)

Unit: mm

Wall

PCD

124

100

65

3-M5xD10(120° arrangement)

3-M5xD10(120° arrangement)

PCD

Wall

80

M5xD10C3

Name
Magnification adjusting film
Gauge block (35 mm, JIS Grade 2)
Level
Standard stylus
Printer paper*
Receptacle
Hose band
Power cable
Leveling spannerPhilips screwdriver
Key wrench 0.9, 2 and 4
Machine cover
User's manual

75
360

Turntable top view

Standard accessories
Order No.
350366611755-04
11BAB941
12AAL021
12BAJ340
­
—
—
—
—
—
—
—
—

135

25

450

min.100

Magnification

25

360

Detector

143

Horizontal arm (X axis)

Maximum probing height
Maximum probing depth
Horizontal travel
Measuring force
Standard stylus (12AAL021)
Measuring range
Measuring direction
Measuring range

Unit: mm20

Vertical travel
Vertical column (Z axis)): Measuring area

117

Turntable

Bearing type
Rotational accuracy (radial)
Rotational accuracy (axial)
Rotation speed
Table diameter
Maximum turntable loading
Maximum probing diameter
Maximum workpiece diameterRA-10
Air bearing(0.04+6H/10000) µm H: Probing height (mm) JISB7451-1997(0.04+6X/10000) µm X: Distance from the center of rotation (mm)6 rpm
ø150 mm
10 kg
ø100 mm
ø320 mm
117 mm·Buttom position: Approx 35 mm from the turntable top*2·Top position: Approx. 152 mm*1 from the turntable top*2
152 mm from the turntable top
100 mm (minimum ID: ø30 mm) using the standard stylus–25 mm to 50 mm
100 mN (±30 %)Stylus tip: ø1.6 mm carbide ball (Refer to page 7 for detailed information.)±1000 µm
Two directional (IN/OUT switchable)±1000 µm, ±100 µm, ±10 µm
×5, ×10, ×20, ×50, ×100, ×200, ×500, ×1,000, ×2,000, ×5,000, ×10,000, ×20,000, ×50,000,
×100,000, ×200,000
Phase corrected: 2CRPC75, 2CRPC50
Not phase corrected: 2CR75, 2CR50 Gaussion, filter OFF
15 upr, 50 upr, 150 upr, 500 upr
15-150 upr, 15-500 upr, 50-500 upr
1-section to 5-section: Roundness, Coaxiality, Flatness
1-section to 3-section: Circular runout (radial)
2-section: Concentricity
LSCI, MZCI, MICI, MCCI
Roundness, Coaxiality, Concentricity, Flatness, Circular runout (radial)
RS-232C I/F, SPC, USB stick memory
LCD 117.2 × 88.4 mm
Thermal line printer, optional external printerJapanese, English, German, French, Italian, Spanish, Portuguese, Korean, Traditional Chinese,
Simplified Chinese, Czech, Polish, Hungarian, Turkish, Swedish, Dutch
AC100 to 240 V, 50/60 Hz
32– 36 W
0.39 MPa
30 L/min (minimum)
26 kg

35

Model

181

Main unit

ø140*12AAH181: Optional printer paper set (10 rolls)

min.6010

max. 505.5

11151 2206(2)g-(CH)NE-(JP7), Printed in Japan

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