Product Information

RVM 4000
Reference Encoder for
the Acceptance Testingof Rotary Axes

ACCOM 4.0
Software for Evaluating
Rotary Axes in Conformity
with Technical Standards

05/2023

RVM 4000
Comparative encoder for the inspection of rotary axes
• Robust and easy to handle• High system accuracy• Zero-contact and wear-free measurement

The wide scanning gap and wide mounting
tolerances enable fast installation andeasy handling. This also makes the systemvery robust and insensitive to external
influences. Measurement can be started invery short time without a warm-up phase.
The RVM 4000 can be used with any control
and, along with all required accessories, iseasy to transport in the provided storagecase. The touchless measurement design
is wear-free and ensures correct results.

The RVM 4000 rotary axis comparative
encoder consists of an optical scale drumon a mounting holder, as well as a scanning
module with three or four scanning heads.
The relative motion between the scanning
module and the scale drum allows theactual motion of the rotational axis to bemeasured and, via the appropriate software,compared with the programmed positions.
In some cases the machine geometry
prevents measurement directly at the centerof the axis's rotation. Thanks to the modular
design of the RVM 4000 and with the aidof the ACCOM 4.0 software, measurement
outside of the center of rotation is possible,
since the control performs compensation
movements in the linear axes. The systemaccuracy specified for the RVM 4000
here also applies to the mounting andoperating tolerances stated in the operating
instructions. Machine-specific component
errors in the associated linear axes caninfluence the measurement result. The
operator must therefore interpret theoverall results.

The RVM 4000 is available in two variants:• Standard device: for measuring rotarytables (RVM 4180)• Optimized for space: for measuring
swivel axes (RVM 4280)
Included in delivery:• RVM 4x80
• Mounting tools• Central fastening via TTR holder (onlywith RVM 4280)
Accessories:• Tool holder• ACCOM 4.0 software• EIB 74x external interface box• 3 or 4 extension cables

RVM 4180

RVM 4280

Area of application

Rotary tables

Swivel axes

Measuring standard
Grating period

METALLUR graduation on a steel drum
40 μm

System accuracy

±0.5“

±1.0“

Possible measurement range

360°

360°

Runout tolerance±0.2 mmInterface

 1 VPP

Measuring step

≥ 0.03“ (with EIB 74x)

Supply voltage

5 V ±0.5 V

Current consumption (typical)< 100 mA (per axis)

Electrical connection

4 x 2.5 m cable with 15-pin D-sub connector;
with locking screws

2)

Components of the RVM 41801)3 x 2.8 m cable with 15-pin D-sub connector;
with locking screws

Cable length≤ 20 mHolder for scanning moduleM30x0.5, adapter for tool holder system available as an accessory

Mechanically permissible shaft speed≤ 100 rpm

Operating temperature

15 °C to 25 °C

Mass
Scanning module
Drum holder
Total including case

 1.4 kg 3.3 kg
 10.7 kg1)2)

 2.2 kg 3.3 kg
 11.1 kg

Achievable measuring range might be limited by the machine geometry
With HEIDENHAIN cable

Dimensions


M30 × 0.5





 190
M30 × 0.5

The RVM 4000 is the ideal solution for
determining the accuracy of a rotary tablewith speed, convenience, and highprecision. It serves as a reference encoder
for the acceptance testing of rotary axesand for machine inspection.





 155

Sample mounting scenario for the RVM 4180

2Sample mounting scenario for the RVM 4280

Product Information RVM 4000/ACCOM 4.0   05/2023

 190

Product Information RVM 4000/ACCOM 4.0   05/2023

 191

3

ACCOM 4.0• Software for use with encoders for machine calibration (RVM 4000)• Data recording and evaluation in conformity with technical standards• Intuitive user guidance

The ideal counterpart to the RVM 4000
comparative encoder is the PC software
ACCOM 4.0. This intuitive software
enables data recording and distinguishes
between preparation and actual measure­ment. Acceptance tests in accordancewith ISO 230-2 and ISO 230-3, as well as
the VDI/DGQ 3441 guideline are possible.
In addition to performing evaluations inconformity with technical standards,
ACCOM 4.0 also features the user-friendly
creation of compensation tables for themachine control and a printout of themeasurement curves and key data forarchiving and documentation purposes,
either for the documentation of acceptancetests or for the customer.
Measurement of static positioning
accuracy
The positioning accuracy and repeatability
is determined on the machine tool throughmovement to certain positions. The
information obtained can be used for theacceptance testing and documentation ofan axis, and also for inspection of thepositioning accuracy or for evaluation in amachine manufacturer’s testing lab.

Measurement of the thermal drift
The thermal behavior of feed axes canbe determined by means of a long-term
positioning test in accordance withISO 230-3. In this case, the table isrepeatedly moved to two axis positions,and the deviation of the positioning
accuracy is plotted as a function of time.
Detailed knowledge about the thermal
positioning stability of a rotary axis can beused to help improve the design andoptimize the use of the cooling system.
This information can also be used in sales
argumentation.
Additional option:
RVM 4280 mounting assistantCentering of the scale drum of theRVM 4280 relative to the horizontal axis ofmeasurement is made difficult by gravity
as well as limited accessibility. TheACCOM 4.0 software offers a mounting
assistant as an additional option for rapid
centering within just a few minutes. Theprogram uses two length gauges or dial
indicators at different axis positions on
the outer centering collar to evaluate thecentering quality. If re-centering isnecessary, then a direction and distanceare indicated.

Measurement of dynamic axis motion(currently in preparation)
With the growing proportion of machining
processes that require continuous 5-axis
motion, the dynamic positioning accuracyof rotary axes is becoming increasinglyimportant. With a service adapter or a
trigger card as an additional accessory, theposition information from the comparative
encoder and the machine’s angle encoder
can be synchronously tracked for theevaluation of any dynamic motion desired.
Along with positioning accuracy and otherfactors, the movement of the rotational
axis within the measurement plane (runout)
can be evaluated as well.

Evaluation in accordance with ISO 230-2

Preparation for measurement

Output in form of a calibration chart

Evaluation in accordance with ISO 230-3

Comparing of evaluations

See for yourself how easy and intuitive ACCOM 4.0 is.
For a free trial version, visit www.heidenhain.com

4

Product Information RVM 4000/ACCOM 4.0   05/2023

Product Information RVM 4000/ACCOM 4.0   05/2023

5Configuration

A typical setup for inspecting a machine
tool consists of the following components:• RVM 4000 encoder for inspecting theaxis motion• EIB 74x external interface box• PC with ACCOM 4.0 (or higher)
evaluation software
The RVM 4000 comparative encoder
touchlessly records the positioning
movements of the rotational axis with highdynamic performance. For this purpose,the scale drum is attached to the rotarytable via the TTR holder (either directly orvia a machine-specific mounting bracket)
and moves with it during the measure­ment. The scanning module is inserted intothe machine’s main spindle via a tool
holder and remains motionless during themeasurement.

Accessories

EIB 700 series (External Interface Box)The EIB 700 series consists of externalinterface boxes for precise position
measurement, specifically for inspection
stations and for mobile data tracking, suchas for machine calibration. They are ideal
for applications that require high-resolution
encoder signals and fast measurement
analysis.

Machines with any type of control can beinspected. The CNC and the PC (via theACCOM 4.0 evaluation software) must
merely have the same programmedmovements. ACCOM 4.0 also offers thepossibility of creating and exporting NC test
programs based on the selected measure­ment parameters. Selectable formats are
HEIDENHAIN Klartext or ISO programs in
simplified G-code.

Up to four HEIDENHAIN encoders withsinusoidal incremental signals ( 1 VPP)
can be connected to the EIB 700 series.
For the measured value formation, theEIB 700 series divides the signal periods ofthe incremental signal by up to 4096-fold.
The measuring channels are synchronouslyrecorded.

ACCOM 4.0 automatically detects whenthe measurement begins. The measuring
points are likewise automatically recorded.
The measurement data are processed in
ACCOM 4.0 and shown in conformity withtechnical standards.

A standard Ethernet interface using TCP/IPor UDP communication is available for data
output, permitting direct connection to aPC, laptop, or industrial PC.

Since this measuring setup operates
completely on its own, no communicationis necessary between the PC and the CNC.

CNC
NC program
Test program

PCACCOM
Test programEIB 741
EIB 742
Encoder inputs

15-pin D-sub connections (female, X11 to X14), for four
encoders

Input signals

 1 VPP

Input frequency≤ 500 kHz

Subdivision factor

4096-fold

Cable length≤ 150 mSoftware

Driver software for Windows

Data interface

Ethernet as per IEEE 802.3 (max. 1 Gbit)

Dimensions

Approx. 213 mm x 152 mm x 42 mm

Supply voltage

EIB 741: 100 V to 240 V AC
EIB 742: DC 24 V

Clamping shanks and tool holders
The RVM 4000 scanning module isdeployed directly in the machine’s spindle.
Various clamping shanks are available forthis. For other clamping shanks or specialsolutions, a connection can also beestablished via standardized cylindricalshanks that are used in the collet chucks.

DIN 69893
Taper
HSK-A-40
HSK-A-63
HSK-A 100

DIN 69871
Taper		DSK-AD/B 50

M24
DIN 6535-HB16

DIN 6535-HE16

RVM 4180 measurement setup with an EIB 741 and a PC with ACCOM 4.0

6

Product Information RVM 4000/ACCOM 4.0   05/2023

Product Information RVM 4000/ACCOM 4.0   05/2023

7

Services performed

HEIDENHAIN offers to perform themachine calibration and optimization with
the RVM 4000 reference encoder andACCOM 4.0 software as a service.
Customer-specific workshops withindividualized topics for autonomous useof the encoder and software can be heldon site.
Consult the Service department atHEIDENHAIN:
www.heidenhain.com/service
 service.ms-support@heidenhain.de +49 8669 31-3104

DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 583301 Traunreut, Germany +49 8669 31-0
 +49 8669 32-5061
info@heidenhain.dewww.heidenhain.com

1356253 · 01 · A · 02 · 05/2023 · PDF

This Product Information document supersedes all previous editions, which thereby
become invalid. The basis for ordering from HEIDENHAIN is always the Product
Information document edition valid when the order is placed.
Further information:
To ensure proper and intended use, comply with the specifications in the following
documents.
• Brochure: Interfaces of HEIDENHAIN Encoders
1078628-xx• Brochure: Cables and Connectors
1206103-xx• Operating Instructions: RVM 4180
1399324-xx• Operating Instructions: RVM 4280
1399325-xx• User's Manual: ACCOM 4.0
1368143-xx