Form Measurement

Compact Roundness Measurement

ROUNDTEST RA-120/120P

Catalog No.E15008(4)Roundtest RA-120
This compact roundness measuring machine is provided with numerous user-friendly features aimed atprioritizing usability, such as a wider range for the detector, an easy-to-understand operation panel withlarge LCD, a D.A.T. function that powerfully supports centering and leveling adjustments, and so on.

• Best-in-class rotational accuracy in compact type roundness
measuring instruments

Operating panel that is read at a glance• Fine adjustment on both X- and Z-axes

Supports 16 languages• Multiple analyses through simple operation

Japanese, English, German, French, Italian,
Spanish, Portuguese, Korean, Traditional
Chinese, Simplified Chinese, Czech, Polish,
Hungarian, Turkish, Swedish, Dutch• D.A.T. function*1• Scaled Z-axis*1• Continuous ID and OD measurement*1• High-precision air bearing

Analysis type

• Wide-range detector*2

Selection buttons provide access to awide variety of analysis types• Registration and calling of measurement results/
conditions• Built-in printerSimple setup
Apply the current measurement
setup in one go
Simple operation helps prevent
operational errors

Switching screen modes• Supports 16 languages

Switch the display at the touch of
a button, providing access to the[Calibration], [Centering and Leveling],[Measurement], and [Result] screens.

*1: Refer to P.6*2: Refer to P.7

Jog dial
Make detailed changes to setup
and other operations

Zero-setting button
No fine adjustment necessary for setting
the measurement position

Simple, interactive display screen
Simplified communication program for ROUNDTEST RA-120

The large LCD screen with backlight shows easy-to-understand measurement results and graphs. Forms can be checked and notch processing
can be set while observing the displayed graphs.
Measurement screen• Set the position of the detector and measurement conditions here
• During measurement, graphs are displayed in real time

Measurement results• Filter, display magnification, etc., can be altered• Besides circles, development views can also be displayed

Measurement
screenThe Roundtest RA-120 has a USB interface, enabling data to be transferred
to a spreadsheet or other software.

Notch processing
Unwanted data, such asthat produced by notches orscratches, can be excluded
from the analysis if desired.
Select between [Automatic
setting] and [Arbitrary
setting].

High-grade thermal printerPrint measurement conditions, computation results, result graphs,
comments, etc., to the thermal printer. Change development graphs andoutput items as desired.
Sample prints

File save
Measurementin progress screen

Result screen

Save and access [Measurement files] and [Result files] in USB memory.
Data can also be totaled using the data output function with commercial
tabulation software.
[Measurement file] [Measurement data (Data output)][Result file] [Result data (Data output)]
Recording paper set (optional set of 10 rolls)

23Roundtest RA-120P
This entry-level desktop tester incorporates the ROUNDPAK multi-analysis evaluation program,which provides it with analytical power close to that of more elaborate models.
This is, therefore, a highly functional multi-analysis roundness measuring machine that issuitable for use not only in measurement rooms, but also in research and development sections.
• Best-in-class rotational accuracy in the Compact TypeRoundness Measuring Instruments

This entry-level desktop tester incorporates the ROUNDPAK multi-analysis evaluation program, which
provides it with analytical power close to that of more elaborate models. This is, therefore, a highly
functional multi-analysis roundness measuring machine that is suitable for use not only in measurement
rooms, but also in research and development sections.

Measurement screen makes ample use of graphs• Fine adjustment on both X- and Z-axes• Multiple analyses through simple operation• D.A.T. function*1• Scaled Z-axis*1• Continuous ID and OD measurement*1• Display function for various graphs• High-precision air bearing• Wide-range detector*2• Supports 18 languages*1: Refer to P.6

Multi-analysis function*2: Refer to P.7

Complete with a wide range of functions including partial enlargement, auxiliary line setup, color change, displacement/angular difference of data between
two points, and so on. Also equipped with notch processing and graph reading functions, which make the machine useful in research departments.
Recalculation can also be performed with the filter and evaluation method changed.

Windows graphical interface
By using a mouse and buttons, identified by corresponding icons, to control
the machine, the Roundtest RA-120P’s interface provides excellent usability.
Functions such as recalculation and graph reading are handled swiftly witheasy-to-understand operations.

Simplified layout function
Computation results for multiple items can be laid out in multiple forms on a single sheet and printed.
This function also supports output to a color printer (optional).

Main screen
Measurement setup screen

Layout setting screen

Result screen
Measurement in progress screen

4

Sample print outputs

5Functions that implement greater efficiency ofmeasurement and range of analysis types
D.A.T. function *except for centering/leveling device (analog micrometer heads)

IN/OUT switchable wide-range detector

This instrument uses the D.A.T. (Digital Adjustment Table) function available
on more sophisticated models, and this provides powerful support for
centering and leveling operations. To perform such operations, the userneed only adjust the digital micrometer heads attached to the rotarytable by the amounts indicated by the display. This function also supports
measurement of notched workpieces.

Mode selection

Preliminary setup

Centering

Leveling

The range of this detector has been extended from that of a conventional
lever head by as much as four times, and is now wider than ever before.
The detector can provide sufficient margin for centering and leveling jobs,
or when measuring large differences. Moreover, the measuring direction
can be switched between inside and outside diameters with a single touchof a button.

2000 µm

RA-120/120P
IN/OUT Switchable wide-range
detector
500 µmRA-120Conventional lever head type

Types of Analysis
Type of
Analysis

Measurement
mode

Evaluation
diagram

RA- RA120 120P

Type of
Analysis

Measurement
mode

Evaluation
diagram

RA- RA120 120P

RA-120P
Parallelism

Roundness

Center ofrotation Initial inclinationfrom table axisleWorkpiece

Flatness

RotaryOffset range adjustment: ±5 mm
Inclination range adjustment: ±1 °Displays amountof offset/inclination

Simpleadjustment

r2-r1

Datum
plane

1 − N

Z-axis scale

N

RadialR

1

Circularrun-out

C

N–

This scale is useful when the measuring height
position needs to be entered, such as whenmeasuring coaxiality, etc. The machine uses an
ABS Digimatic scale unit to provide an effectivemeans for repetitive measurement and position
setting.

r1

Squareness

Relativeto PlaneThis function comes in very handy when outside
diameter and inside diameter surfaces need
to be measured repeatedly, for example, withrespect to coaxiality, deviation in wall thickness,
etc. The inner surface can be measured andevaluated with the detector, maintaining
the same measuring position for the outside
diameter without changing its orientation, as
illustrated on the right.
Inside diameters down to 50 mm can bemeasured.

r2-r1

r2

Axial

R

SquarenessTwo preliminary measurements are made at cross-sections [A] and [B]Continuous ID and OD measuring function

Squareness

R

Centering/levelingcomplete

Concentricity

Axial

1

2×C

Of
sectionPower
spectrum—

2×C

Coaxality
Continuous inside andoutside diameter function(outside dia. surface)

Of axis

L

1
N

Axis 1–

Continuous inside andoutside diameter function(inside dia. surface)N–

Axis 2
L

Preliminary
measurement

Relative
to AxisAdjust the digital micrometerheads on the rotary table by
the amount indicated to correct
the initial offset and inclination

r1

Thicknessvariation

Against
Axis

Initial offset from
center of rotation

6

Radial–ta b

Workpiece

Rotary

t ab
l

e

r2

Center of rotation

1—

Profileoperation——

7

Optional Accessories

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

For standard applications66

ø4
Example11.7

7

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

30°

7.5

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

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

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

Enlarged image

Enlarged image

ø4.5
Enlarged image

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

ø3

ø1.6 carbide ball

12AAL033
Cranked stylus (stylus tip: ø1 carbide ball)ø3
ø1.6 carbide ball

12AAL034
Stylus for flat surface

5

ø4

66

5.5

ø4

2.5

ø0.5 carbide ball

ø1 carbide ball

66

0.5

211-014
OD with outer jaw: ø2 - 35 mm
ID with inner jaw: ø25- 68 mm
OD with outer jaw: ø35 - 78 mm
External size (D x H) ø157 x 70.6 mm
Mass
3.8 kgIndividual collets*4

Provides high clamping repeatability due to theuse of optional precision collets.
(See table at right.)

Order No.
211-061
Part holding range OD ø0.5–10 mm*2
Centering error
Within 50 μm*3
Mass
1.4 kg*2: Collets to match the workpiece size range are required for use withthis chuck.
*3: When measured with ø5 mm pin gauge at measuring height of 30
mm.

These collets are for use with the collet chuckshown at left and are acquired to match theworkpiece diameter range required.
Order No.
12AAH402
12AAH403
12AAH404
12AAH405
12AAH406
12AAH407
12AAH408
12AAH409
12AAH410
12AAH411
12AAH412
12AAH413
12AAH414

Part Holding Range
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

Auxiliary stage for a short workpiece
356038Reference hemisphere211-016

Magnification checking gage211-045*4: A collet cannot be mounted on the rotary table without a collet chuck.
*4: YCC10-** Class AA, made by Yukiwa Seiko Inc. or its equivalent.

Allows the user to return the detector rapidly
and easily to a fixed position in the X axis.

Vibration-damping standGage block set for calibration
997090

R1

ø4

ø2
66

Order No.
211-031
Holding range
OD: ø0.2 - ø1.5 mm
External size (D x H) ø107 x 48.5 mm
Mass
0.6 kgX-axis stop

68

67.5

67.5

38

52.5
18

ø1.5

ø0.8 carbide ball

ø1.2

20

10

ø1.2

12

2.5

3

ø1

ø0.5 carbide ball

ø0.6

Order No.
Holding range

66

66
52.5

52.5

52.5
ø0.3

Order No.
Holding range

ø4

66

66

ø4

40

Enlarged image

ø4

Microchuck

For clamping a small workpiece, 1 mm or lessin diameter, that cannot be held in the centeringchuck.

Collet chuck

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)Three-jaw chuck (key operated)

Useful where it is necessary to apply a higher
clamping force to the workpiece than can beapplied with the centering chuck.

211-032
OD with inner jaw: ø1 - 36 mm
ID with inner jaw ø16 - 69 mm
OD with outer jaw: ø25 - 79 mm
External size (D x H) ø118 x 41 mm
Mass
1.2 kgExample52.5

ExampleCentering chuck (knurled ring operated)

Provides good operability when measuring asmall-diameter workpiece. The knurled ringallows the workpiece to be clamped easily.

For inside-corner applications

ø4

5.5

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

12AAL024
Stylus for corners (stylus tip: R0.25 sapphire)

For stepped applications

ø4

66

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

52.5

52.5

66

ø4

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

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

52.5

12AAL021
Standard stylus

Unit: mm

52.5

66

ø4
For upper/lower surface in a narrow groove

ExamplePrinter paper 10 roll/set

22.7

8.2°

Exampleø0.8

12AAH181

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

ø1 carbide ball

12AAL031
Disk stylus

12AAL043
M2 tapped shank for CMM styli

ø2
R1

0.5

Machining marks

ø12

M2 depth 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.

8

M2

Order No.
Mass

12AAH320
65 g

Replacement elements for the air filter
358592 (for filter)
358593 (filter regulator)

Simplified communication program for ROUNDTEST RA-120
The Roundtest RA-120 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.

Required environment:
66
68.5

ø4

56

ø4

0.5

5°
10
R 15

ExampleFor narrow groove
applications

42.5

52.5

66
52.5

66

ø4
ExampleCompatible 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

ø412AAL044
M2 tapped shank for CMM styli

52.5

12AAL025
Stylus for filtering asperities (machining marks)

Order No.
211-013Vibration damping system Diaphragm type air spring
External size
615 x 515 x 51 mm
Max. loading mass
150 kg3.5• OS: Windows XP-SP3• Spreadsheet software: Microsoft Excel 2010
Windows VISTA		Microsoft Excel 2016
Windows 7 (32bit/64bit)
Windows 10*Windows OS and Microsoft Excel are products of Microsoft Corporation.

The optional USB cable is also required.
• USB cable for RA-120 series
12AAH490
This program can be downloaded for FREE from the Mitutoyo website.
https://www.mitutoyo.co.jp/eng/

9

Specifications

Dimensions

Main unit

External dimensions
Data analysis by PC(0.04+6 H/10000) µm H: Probing height (mm) JISB7451-1997

Axial(0.04+6X/10000) µm X: Distance from the center of rotation (mm)6 rpm
150 mmCentering range adjustment±3 mm

Leveling range adjustment±1 °Analog head

Digital head(mm)

Digital head(inch/mm)

Maximum probing diameter

280 mm (380 mm in a reverse and vertical detector position)

Maximum workpiece diameter

440 mm
25 kg

Vertical travel

280 mm from the turntable top
280 mm from the turntable top (480 mm in the reverse and vertical detector configuration)

Maximum probing depth
Horizontal arm (X axis) Horizontal travel

100 mm (minimum ID: 30 mm)
165 mm (Including a protrusion of 25 mm from the turntable rotation center)

Measuring direction

Two directional (IN/OUT switchable)

Measuring range±1000 µm

Measuring force

70 to 100 mN (±30 %)Standard stylus (12AAL021)
Measuring range
Magnification

Carbide ball, ø1.6 mm (.06 ”)

Number of measuring sections
Evaluation type

15 upr, 50 upr, 150 upr, 500 upr, Manual
15-150 upr, 15-500 upr, 50-500 upr, Manual

Maximum 5

Maximum 100

Turntable top viewRoundness, coaxality, concentricity, flatness, circular run-out (radial/axial), squareness (relative to axis/plane),thickness deviation, parallelism

Installation floor plan
Unit: mm

Unit: mm

LSC, MZC, MIC, MCC

Power inlet

Adjusting centering/leveling

DAT function (circular/multi-point switchable)

Air inlet

FunctionsNotched measurement, re-calculation, limaçon error
correction, continous ID and OD measurement

Notched measurement, re-calculation, limaçon error
correction, remarkable point analysis (gear), harmonic
analysis, continous ID and OD measurement

Printer

Built-in thermal line printer, optional external printerWindows compatible ink-jet printerJapanese, English, German, French, Italian, Spanish,
Japanese, English, German, French, Italian, Spanish, Portuguese,
Portuguese, Korean, Traditional Chinese, Simplified
Korean, Traditional Chinese, Simplified Chinese, Czech, Polish,
Hungarian, Turkish, Swedish, Russian, Dutch, Thai
Chinese, Czech, Polish, Hungarian, Turkish, Swedish, Dutch

USB

Air consumption
Mass

100

P.C
.

3-M5 x D10(120° arrangement)
D.

14

65

3-M5 x D10(120° arrangement)

3

Wall

Calculation result, measurement data360

Calculation result

Power supply
Air pressureWallCalculation result, measurement data

SPC
Power consumption

115

360

: Measuring area

Filter OFF

15 upr, 50 upr, 150 upr, 500 upr
15-150 upr, 15-500 upr, 50-500 upr

Data output RS-232C

AC 100 – 240 V
32 – 36 W

21 – 24 W (excluding PC system)

1

.9

.D

P.C

0.39 MPa
30 L/min (minimum)
Main unit: 32 kg Air filter: 2 kg
min. 60

1075Reference circle for evaluation

Display languages

OthersNot phase corrected: 2CR75, 2CR50

135

25

450

X1 to X500,000

Phase corrected: Gaussian, 2CRPC75, 2CRPC50

Cutoff value

400

25

8 steps: ±(1000, 500, 200, 100, 50, 20, 10, 5) μm
X5 to X200,000

Filter type

20

Vertical column (Z axis) Maximum probing height

Electronic unit

Digital head(inch/mm)

52

Maximum turntable loading

Detector

Digital head(mm)

Analog headmin. 100

Centering/leveling device(micrometer head)

280

Rotational speed
Table diameter

140

473

Radial25

181

Turntable

Dedicated electronic analysis type

Unit: mm636

Rotational
accuracy

RA-120P

143

Model

RA-120max. 641.5

11149 2206(4)g-(CH)NE-(JP10), Printed in Japan

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