NTN-SNR LINEAR AXIS AXC Series User manual

www.ntn-snr.com
NTN-SNR LINEAR MOTION:
LINEAR AXIS
With You

NTN-SNR does not acknowledge any liability for any errors and omissions deficiencies occurring - despite our great care – with
reference to the publication of this technical catalog. We are entitled to make any complete or partial changes to products or
characteristics/data in/of this document in accordance to our continous research and development policy, without prior notice.
NTN-SNR Copyright International 2018.
NTN-SNR
THE STRENGTH OF A GROUP
We are one of the largest bearing manufacturers in the world in
conjunction with the Japanese company NTN.
NTN-SNR has been established in the linear technology market
since 1985 and strives to offer a complete and competitive product
range. This position allows us to provide our customers with a high
level of added value regarding service, quality and product variety.
Our sales support and application engineers are always on hand to
offer you optimal support.
The consulting and planning service is based on many years of
interdisciplinary experience.
That means less design effort and costs on the part of the users.
Our sales and application engineers will gladly help you with their
expertise. We are looking forward to your enquiries. Our goal is to
achieve joint, constructive solutions.
Product quality, economic efficiency and high user benefits
are the basis of a strategic partnership between
NTN-SNR and you – our customer.
NTN-SNR leads you towards reliability and performance.
Advantages:
•Complete program of linear products for all industrial areas
•Production facilities in Europe and Asia
•Optimal support by our technical sales and our application
engineers near you – worldwide
•State of the art technology (patented solutions)
•State of the art production methods to ensure highest
product quality
•Well organized logistic network to ensure on time delivery
•Customized solutions as “genetic code” in our daily business.
•Finding out the most economical solutions together with
our valued customers
German production facility in Bielefeld

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The Linear Axis are used in many different applications, such as:
• Machine tool manufacture
• Packaging and printing machines
• Special and general engineering
• Aircraft construction
• Automation and assembly lines
• Wood and paper industry
• Semiconductor industry
• Medical engineering
• and much more
The different series are designed according to a modular principal.
This technical catalogue provides an overview of our Linear Axis range and forms the
basis of our discussions with you – our customer.
NTN-SNR Linear Axis are universally applicable modules that accommodate the steadily growing
requirements for the automation of installation and manufacturing processes. NTN – SNR produce
one of the widest ranges of Linear Axis in the market.
Advantages:
•Customized solutions according the specic customer
request.
•NTN-SNR Linear Axis can be nearly arbitrary combined
within one series and between different series.
•The Linear Axis can be connected with different connecting
elements, sliding blocks or special fastening strips.
•Multi axis systems can be equipped with gearboxes,
couplings, coupling cones, switches and additional with
energy chains.
•Depending on the task, NTN-SNR Linear Axis offer not only
exible driving and guiding systems but also allow adequate
freedom for customized solutions.

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Table of contents
1.________ Technical basics Linear Axis................................................. 7
1.1________ Product features ..................................................................... 7
1.2________ Driving systems ...................................................................... 9
1.3________ Guiding systems .................................................................... 12
1.4________ Selection criteria .................................................................... 14
2.________ System technology .......................................................... 15
2.1________ Denition .......................................................................... 15
2.2________ Declaration of incorporation for partly completed machinery (Machinery directive 2006/42/EG) ......... 15
2.3________ Safety instructions ................................................................... 16
2.4________ Intended use ....................................................................... 16
2.5________ Coordinate system................................................................... 16
2.6________ Static load capacity .................................................................. 17
2.7________ Life time........................................................................... 17
2.7.1 ______ Dynamic load capacity / Nominal life time ................................................. 17
2.7.2 ______ Inuence factors .................................................................... 17
2.8________ Rigidity............................................................................ 18
2.9________ Dynamic operating load ............................................................... 19
2.10_______ Precision .......................................................................... 19
2.11_______ Gearbox selection ................................................................... 20
2.11.1 _____ Maximum operation speed ............................................................ 20
2.11.2 _____ Maximum acceleration torque .......................................................... 20
2.11.3 _____ Nominal torque on the drive............................................................ 20
2.12_______ Drive calculation..................................................................... 21
2.13_______ Selection of Linear Axis with toothed belt drive for 90° tilt mounting (wall mounting) ................. 21
3.________ Mounting and Start-up...................................................... 22
3.1________ Transportation and storage ............................................................ 22
3.2________ Design of the mounting surfaces / mounting tolerances....................................... 22
3.3________ Mounting instruction ................................................................. 24
3.4________ Mounting of parallel Linear Axis ......................................................... 25
3.5________ Start-up of Linear Axis ................................................................ 26
3.6________ Assembly of couplings on Linear Axis with toothed belt drive................................... 26
3.7________ Drive assembly ..................................................................... 27
3.7.1 ______ Drive assembly on Linear Axis with toothed belt drive and coupling cone ......................... 27
3.7.2 ______ Drive assembly on Linear Axis with toothed belt drive and planetary gearbox ...................... 27
3.7.3 ______ Drive assembly on Linear Axis and Linear Tables with screw drive ............................... 29
3.8________ Assembly of a deection belt drive on Linear Axis and Linear Tables with screw drive ................ 30
4.________ Maintenance and lubrication ............................................... 32
4.1________ General information .................................................................. 32
4.2________ Lubrication......................................................................... 32
4.3________ Lubricants ......................................................................... 32
4.4________ Lubrication methods ................................................................. 34
4.4.1 ______ Manual grease guns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.2 ______ Automatic electro-mechanical lubricator DRIVEBOOSTER .................................... 35
4.4.3 ______ Central lubrication system CONTROL BOOSTER .......................................... 35
4.5________ Lubrication points ................................................................... 36
4.6________ Amounts of lubricant ................................................................. 38
4.7________ Lubrication intervals .................................................................. 41
4.8 _______ Brush wiper replacement .............................................................. 43

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4.9________ Cover strip replacement............................................................... 43
4.9.1 ______ Cover strip repalcement for Linear Axis of the series AXC ..................................... 43
4.9.2 ______ Cover strip repalcement for Linear Axis of the series AXDL .................................... 45
4.10_______ Wear part sets ...................................................................... 45
5.________ NTN-SNR Linear Axis ....................................................... 46
5.1________ General view ....................................................................... 46
5.1.1 ______ Series ............................................................................ 46
5.1.2 ______ Main parameters .................................................................... 51
5.2________ AXC Compact Axis .................................................................. 54
5.2.1 ______ AXC_Z Compact Axis with toothed belt drive............................................... 54
5.2.1.1 ____ Structure .......................................................................... 54
5.2.1.2 ____ Dimensions / Technical data ........................................................... 55
5.2.1.3 ____ Maximum static load capacity .......................................................... 60
5.2.1.4 ____ Dynamic load capacity................................................................ 60
5.2.2 ______ AXC_S / T Compact Axis with screw drive................................................. 61
5.2.2.1 ____ Structure .......................................................................... 61
5.2.2.2 ____ Dimensions/ Technical data ............................................................ 62
5.2.2.3 ____ Maximum static load cacpacity ......................................................... 72
5.2.2.4 ____ Dynamic load capacity................................................................ 72
5.2.3 ______ AXC_A Compact Axis with toothed belt / Ω - drive .......................................... 73
5.2.3.1 ____ Structure .......................................................................... 74
5.2.3.2 ____ Dimensions / Technica data ............................................................ 74
5.2.3.3 ____ Maximum static load capacity .......................................................... 78
5.2.3.4 ____ Dynamic load capacity................................................................ 78
5.3________ AXF Compact Axis................................................................... 79
5.3.1 ______ AXF_Z Compact Axis with toothed belt drive ............................................... 79
5.3.1.1 ____ Structure .......................................................................... 79
5.3.1.2 ____ Dimensions / Technical data ........................................................... 80
5.3.1.3 ____ Maximum static load capacity .......................................................... 81
5.3.1.4 ____ Dynamic load capacity................................................................ 81
5.3.2 ______ AXF_S / AXF_T / AXF_G Compact Axis with screw drive ...................................... 82
5.3.2.1 ____ Structure .......................................................................... 82
5.3.2.2 ____ Dimensions / Technical data ........................................................... 83
5.3.2.3 ____ Maximum static load capacity .......................................................... 85
5.3.2.4 ____ Dynamic load capacity................................................................ 85
5.4________ AXDL Parallel Axis ................................................................... 86
5.4.1 ______ AXDL_Z Parallel Axis with toothed belt drive ............................................... 86
5.4.1.1 ____ Structure .......................................................................... 86
5.4.1.2 ____ Dimensions / Technical data ........................................................... 87
5.4.1.3 ____ Maximum static load capacity .......................................................... 90
5.4.1.4 ____ Dynamic load capacity................................................................ 90
5.4.2 ______ AXDL_S / T Parallel Axis with screw drive ................................................. 91
5.4.2.1 ____ Struture ........................................................................... 91
5.4.2.2 ____ Dimensions / Technical data ........................................................... 92
5.4.2.3 ____ Maximum static load capacity .......................................................... 98
5.4.2.4 ____ Dynamic load capacity................................................................ 98
5.4.3 ______ AXDL_A Parallel Axis with toot belt / Ω - drive.............................................. 99
5.4.3.1 ____ Structure .......................................................................... 99
5.4.3.2 ____ Dimensions / Technical data .......................................................... 100
5.4.3.3 ____ Maximum static load capacity ......................................................... 102
5.4.3.4 ____ Dynamic load capacity............................................................... 102
5.5________ AXLT Linear Table Axis............................................................... 103
5.5.1 ______ AXLT_S / T Linear Table Axis with screw drive ............................................. 103

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5.5.1.1 ____ Structure ......................................................................... 103
5.5.1.2 ____ Dimensions / Technical data .......................................................... 104
5.5.1.3 ____ Maximum static load capacity ......................................................... 112
5.5.1.4 ____ Dynamic load capacity............................................................... 112
5.6________ AXBG Precision Axis ................................................................ 113
5.6.1 ______ AXBG Precision Axis with screw drive ................................................... 113
5.6.1.1 ____ Structure ......................................................................... 113
5.6.1.2 ____ Dimensions / Technical data .......................................................... 114
5.6.1.3 ____ Load ratings....................................................................... 128
5.6.1.4 ____ Maximum stroke length .............................................................. 129
5.6.1.5 ____ Precision classes ................................................................... 130
5.7________ AXS System Program Axis............................................................ 131
5.7.1 ______ AXS_TA Telescopic Axis with toothed belt / Ω - drive ........................................ 131
5.7.1.1 ____ Structure ......................................................................... 131
5.7.1.2 ____ Dimensions / Technical data .......................................................... 122
5.7.1.3 ____ Maximum static load capacity ......................................................... 133
5.7.1.4 ____ Dynamic load capacity............................................................... 133
5.7.2 ______ AXS_M Lifting and Gantry Axis with rack and pinion drive .................................... 134
5.7.2.1 ____ Structure ......................................................................... 134
5.7.2.2 ____ Dimensions / Technical data .......................................................... 134
5.7.2.3 ____ Maximum static load capacity ......................................................... 141
5.7.2.4 ____ Dynamic load capacity............................................................... 141
5.7.3 ______ AXS_T Horizontal and vertical Telescopic Axis with rack and pinion drive / toothed belt drive ......... 142
5.7.3.1 ____ Structure ......................................................................... 142
5.7.3.2 ____ Dimensions / Technical data .......................................................... 143
5.7.3.3 ____ Maximum static load capacity ......................................................... 148
5.7.3.4 ____ Dynamic load capacity............................................................... 148
5.7.4 ______ AXS_Y Gantry Axis with lateral toothed belt drive........................................... 149
5.7.4.1 ____ Structure ......................................................................... 149
5.7.4.2 ____ Dimensions / Technical data .......................................................... 150
5.7.4.3 ____ Maximum static load capacity ......................................................... 151
5.7.4.4 ____ Dynamic load capacity............................................................... 151
5.7.5 ______ AXS_Z Gantry Axis with toothed belt drive ................................................ 152
5.7.5.1 ____ Structure ......................................................................... 152
5.7.5.2 ____ Dimensions / Technical data .......................................................... 153
5.7.5.3 ____ Maximum static load capacity ......................................................... 154
5.7.5.4 ____ Dynamic load capacity............................................................... 154
5.8________ AXLM Linear Motor Axis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
5.8.1 ______ AXLM_EA / AXLM_EW............................................................... 155
5.8.1.1 ____ Structure ......................................................................... 155
5.8.1.2 ____ Dimensions / Technical data .......................................................... 156
5.8.1.3 ____ Maximum static load capacity ......................................................... 159
5.8.1.4 ____ Dynamic load capacity............................................................... 159
5.8.1.5 ____ Feeding force...................................................................... 160
5.8.1.6 ____ Force –Velocity - Characteristic ........................................................ 161
5.8.1.7 ____ Current consumption ................................................................ 162
5.8.1.8 ____ Motor Interface .................................................................... 163
6.________ Accessories.................................................................. 164
6.1________ Fastening and connecting elements..................................................... 164
6.1.1 ______ Fastening strips / fastening elements .................................................... 164
6.1.2 ______ Sliding blocks ..................................................................... 166
6.1.3 ______ Hammer screws ................................................................... 168
6.1.4 ______ Direct connection................................................................... 169

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6.1.5 ______ Cross connection................................................................... 171
6.1.6 ______ Gantry connection .................................................................. 173
6.1.7 ______ A – Standard connection ............................................................. 174
6.1.8 ______ Angle connection................................................................... 176
6.2________ Drive options ...................................................................... 178
6.2.1 ______ Plug-in shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
6.2.2 ______ Couplings and connecting shafts....................................................... 179
6.2.3 ______ Gearboxes........................................................................ 181
6.2.3.1 ____ Version ZS and ZT – Plug-in planetary gearbox ............................................ 181
6.2.3.2 ____ Version ZE and ZP - Integrated planetary gearbox .......................................... 183
6.2.3.3 ____ Mounted gearboxes................................................................. 186
6.2.4 ______ Adapters / Coupling cones ........................................................... 186
6.2.4.1 ____ Linear Axis toothed belt drive.......................................................... 186
6.2.4.2 ____ Linear Axis with screw drive, coupling and coupling cone .................................... 188
6.2.4.3 ____ Linear Axis with screw drive and integrated coupling ........................................ 191
6.2.5 ______ Deection belt drive ................................................................. 192
6.3________ Switches ......................................................................... 194
6.3.1 ______ Switch versions .................................................................... 194
6.3.2 ______ Cable guiding...................................................................... 195
6.3.3 ______ Mounting options................................................................... 195
6.3.4 ______ Dimension ........................................................................ 200
6.3.5 ______ Line splitter ....................................................................... 202
6.3.6 ______ Technical data ..................................................................... 202
6.3.7 ______ Possible switch combinations ......................................................... 203
6.4________ Energy chains ..................................................................... 205
6.5________ Gantry support legs ................................................................. 206
6.6________ Groove inserts ..................................................................... 208
6.7________ Connection for sealing air or air suction .................................................. 209
6.8________ Balance cylinder ................................................................... 210
6.9________ Safety breaks...................................................................... 211
6.10_______ Lubrication connections.............................................................. 212
7. _____ Multi - Axis - Systems...................................................... 213
7.1________ Standard combinations AXC - AXDL .................................................... 213
7.2________ Standard combinations AXS – AXC - AXDL ............................................... 215
7.3________ Standard combinations AXS .......................................................... 217
8. _____ Systematic................................................................... 220
8.1________ Type code single axis................................................................ 220
8.2________ Type code axis systems.............................................................. 223
8.3________ Options .......................................................................... 224
8.3.1 ______ Conguration versions ............................................................... 224
8.3.2 ______ Safety options ..................................................................... 227
9. _____ Special solutions ............................................................ 228
10.____ Type list....................................................................... 231
11.____ Fits ............................................................................ 232
12.____ Guide to queries ............................................................ 234
13.____ Index.......................................................................... 237

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1. Technical basics Linear Axis
1Base prole
2Slider unit with carriages or Track rollers
3Drive element
4Drive unit or Drive bearing unit
5
Cover strip or Protection elements (optional)
NTN-SNR – Linear Axis are compact components which contain a combination of guiding and driving elements. The modular design
and the ability to combine Linear Axis within a product line and various product lines allow the user to design a simple, time-saving and
economical solution for linear movements. The use of high quality components guarantees a high quality and reliability of Linear Axis.
The gures 1.1 to 1.4 show the basic structure of all NTN-SNR - Linear Axis and their main components:
Figure 1.1 ___ Structure Toothed belt axis
Figure 1.3 ___ Structure Rack-and-Pinion axis
Figure 1.2 ___ Structure Screw drive axis
Figure 1.4 ___ Structure Linear motor axis
1.1 Product features
Figure 1.5 ___ Prole with guiding rails Figure 1.6 ___ Prole with steel shafts
The base prole holds the guiding rails in case of Linear Guides or steel shafts in case of Track Roller Guides. The guiding rails are
screwed to the prole (Figure 1.5), the steel shafts are pressed into in the prole (Figure 1.6). The base prole is, with few exceptions,
an anodized aluminum prole. The Linear Axis of the AXBG series and special designs of AXS and AXLT series are based on steel
proles. The base prole largely determines the stiffness of a Linear Axis.

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The slider unit is a complex assembly group which is usually made of an aluminum prole or consists of aluminum components.
The carriages or track rollers are mounted to the slider unit. The slider unit also connects the drive elements with the guiding elements
of a Linear Axis. At the top side of the slider unit are threaded holes (Figure 1.7) or prole grooves (Figure 1.8) to secure the customer’s
extensions.
The slider unit also contains the easily accessible service points for the lubrication of the guiding system and the drive elements
(Figures 1.12 und 1.13).
Depending on the series, various sealing elements (Figures 1.9 and 1.10) and the deection system for cover strips can be integrated
into the slider unit (Figure 1.11).
The product range of NTN-SNR - Linear Axis provides a variety of benets:
•Versatile applications by a complete product range from miniature
to heavy load axis in almost all industrial sectors
•Different driving and guiding systems combinable
•High load capacity
•High velocity
•Optimized aluminum proles in popular dimensions
• Standard grooves for sliding blocks
•Exclusive use of high quality components
•Flexible combination of Linear Axis including all connecting
elements
•Wide range of accessories for the drive assembly
• Delivery of pre-finished units and complete assembled
multi-axis-systems
•In addition, the compact design and the clear forms fulll the
technical criteria as well as providing high reliability
•Wide range of connecting elements and accessories
Figure 1.11 __ Cover strip deection in the
slider unit
Figure 1.7 ___ Slider unit with threaded holes
Figure 1.12 __ Slider unit with laterally placed grease nipples
Figure 1.9 ___ Slider unit with brush wipers
Figure 1.8 ___ Slider unit with prole grooves
Figure 1.13 Slider unit with grease nipples on the front side
Figure 1.10 __ Slider unit with side seals

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Depending on the series, NTN-SNR – Linear Axis, can be be produced with toothed belt drive, screw drive, rack and pinion drive or
linear motor drive.
The adjustment of the toothed belt tension for NTN-SNR – Linear
Axis is done by a radially moveable deecting pulley (Figure1.15).
Toothed belt drive
Linear Axis with toothed belt drive are suitable for fast handling and positioning applications. All axis are equipped with AT or STD toothed
belt. These are extruded polyurethane belts with integrated steel cords. The AT toothed belts are carried out in the zero-gap shape.
The use of black toothed belts prevents discoloration of the toothed belts under UV - radiation. These toothed belts are also characterized
by the following properties:
• Low wear
• Maintenance free
• High tensile strength and low elongation
• High precision – Pitch error ± 0,2mm/m
• UV – resistant
• Temperature range -25°C to +75°C, special version for use below -25° possible
• Low noise level
• Versions with approval for the food industry
1.2 Driving systems
Figure 1.14 __ Toothed belt clamping Figure 1.15 Toothed belt tension
The special design of the toothed belt clamping via toothed
segments (Figure 1.14) allows an unweakend clamping of the belt.
The setting of the correct toothed belt tension is made by a NTN-SNR - measuring device with which the exact tension will be adjusted
with the help of a force sensor (Figure 1.16).
Thus, there is no risk of overloading of the toothed belt or the
failure of the pulley bearing due to excessive toothed belt tension.
Furthermore, optimum driving characteristics by a centered
alignment and low wear are ensured.
Advantages of toothed belt axis
•High dynamic
•Great lengths realizable
•Cost efcient
•Maintenance free drive element
Figure 1.16 __ Measuring device for the toothed belt tension

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Figure 1.17 __ Linear Axis with screw drive
Figure 1.18 __ Support unit
In order to achieve a high velocity even at longer lengths, it is possible to equip the Linear Axis of the AXC and AXDL series with one
or more sets of screw drive support units (Figure 1.18).
Advantages of screw drive axis
•Long strokes with high position accuracy
•Long strokes with high velocity by the optional use of screw drive support units
•A choice of various pitches
•Self-locking when using trapezoidal screws
•High feeding forces
•High rigidity of the drive element
•Usually no gearbox necessary
Screw drive
Linear Axis with screw drive can be equipped with ball screws (Figure 1.17) and with trapezoidal screws. Screw drives are especially
suitable for high requirements for positioning accuracy and repeatability in combination with high rigidity of the driving element.
The drive adaption can be done directly by coupling and coupling cone or with a deection belt drive.

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Rack and pinion drive
Linear Axis with rack and pinion drive are characterized by a very high reliability and are therefore particularly suitable for vertical
applications. It is possible to line up any number of rack segments (Figure 1.19). The inductive hardened racks and pinions (Figure
1.20) ensure a very long service life.
Advantages of linear motor axis
•Theoretically unlimited length possible
•Several drive units possible
•High feeding forces
•Highest rigidity of the drive element even with high loads
Linear motor drive
For Linear Axis with linear motor drive there is no mechanical conversion of a rotary into a translatory movement necessary. For this
reason, a linear motor is described as linear direct drive. The driving force is directly generated by a motor integrated in the slider unit
(Figure 1.21).
Advantages of linear motor axis
•Theoretically unlimited length possible
•Several drive units possible
•Highest position accuracy and repeatability
•Very high velocity and acceleration
•Maintenance and wear free drive element
•Very low noise level
Figure 1.19 __ Rack segments
Figure 1.21__ Linear motor
Figure 1.20__ Rack and pinion

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NTN-SNR - Linear Axis can, depending on the series, be equipped with linear guides or various kinds of track roller guides.
These selection possibilities allow an extremely exible reaction to the requirements of the application and the environmental conditions
and to choose the optimal conguration of the Linear Axis. If Linear Axis are used as a pure driving element, a version without guiding
elements is possible.
1.3 Guiding systems
Linear guides
NTN-SNR - Linear Axis of all series are equipped with linear guides with ball chain technology (Figure 1.22). By the arrangement of
raceways at a 45° angle, the NTN-SNR - Linear guides can be used universally and have equal load ratings in all main load directions.
Among the special features of NTN-SNR - Linear guides with ball chain have integrated lubricant reservoirs. Usage of these linear
guides has the following advantages:
• High load ratings
• High service life lime
• Long-term maintenance free
• Low temperature generation
• High tolerance compensation capacity and error compensation by DB Conguration of the raceways
• Low noise level
• High running smoothness
• High velocity up to 5 m/s
• High acceleration up to 50 m/s²
Figure 1.22__ NTN-SNR – Linear guides with ball chain

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Track roller guides
As track roller guides, various types of rollers can be used, depending on the series.
All sizes of AXC and AXDL series are available with track roller
guides in steel design (Figure 1.23).
This system consists of track rollers which are running on hardened,
ground steel shafts which are pressed into the aluminum prole.
The steel shafts are permanently re-lubricated from outside with
lubricating oil from a rellable oil reservoir. The track rollers are
dustproofed two-row angular contact ball bearing with proled
outer ring.
Through an eccentric mounting of the half of the track rollers, the
guiding system can be settled exactly, and gets always the right
preload or zero backlashes from our production.
This technology ensures an excellent running performance and
offers the following advantages:
• Very cost efcient guiding system, especially for
long strokes
• Long service life time by the use of dustproofed and
pre-lubricated track rollers placed inside the prole
• Very high velocity up to 15 m/s
• High acceleration up to 50 m/s²
Linear Axis of the AXF series can be equipped optionally with
polymer track rollers (Figure 1.24) as guiding system. In this variant,
the rollers are running directly on the surfaces of the aluminum
prole. The adjustment of the preload is realized via a spring
element in the two-part slider unit during the assembly process.
The polymer track rollers are connected with the slider unit by sliding bearings. Linear Axis with this guiding system can be used even
in wet areas, in areas with heavy contamination or in contact with aggressive media.
This guiding system is characterized by the following features:
• Very high chemical resistance
• Maintenance free and dirt resistant track rollers
• Good mechanical dumping performance
• Inside of the prole arranged track roller system
• Very high velocity up to 7 m/s
• High acceleration up to 30 m/s²
Figure 1.23__ NTN-SNR – Linear Axis with track roller guide
Figure 1.24 __ NTN-SNR – Linear Axis with polymer track roller guide

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1.4 Selection criteria
Description of the application
Description of the static load of the the guiding and drive system
Description of the maximum system deformation
Description of the enviromental conditions
Determining of the maintenance interval
Description of the dynamic load of the the guiding and drive system
Determining of the equivalent static load of the the guiding and drive system
Determining of the system deformation
Selection of the conguration versions, safety options, accessories and lubricant
Determining of the type code
Determining of the equivalent dynamic load of the the guiding and drive system
Selection of the drive element
Toothed belt
Selection of the series
Screw drive Rack and pinion Linear motor
Preliminary selection of the size
Check-up of the dynamic load capacity / life time of the guiding and drive system
Check-up of the system deformation
Check-up of the static load capacity of the the guiding and drive system

i.V. Ulrich Gimpel
(Industry Engineering Division Head)
SNR WÄLZLAGER GMBH - Friedrich-Hagemann-Straße 66 D-33719 Bielefeld, Germany
Bielefeld, December 2013
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2. System technology
Linear Axis are pre-nished units with a combination of precise guiding and driving elements. Thereby Linear Axis with their variations
are cost efcient and extremely compact components for machines and systems which could be mounted and placed into operation
within a short time.
The selection of Linear Axis could be based on following criteria:
For the selection of NTN-SNR - Linear Axis our sales and application engineers with years of experience are also available.
The manufacturer SNR WAELZLAGER GMBH, Friedrich-Hagemann-Straße 66, D-33719 Bielefeld, Germany hereby declares that the
components of the partly completed machinery from the series “Linear Axis AX” and “Linear Axis Systems AS”:
• Following essential health and safety requirements in accordance to Annex I of machinery directive 2006/42/EG are
applied and fullled:
General principles:
1.1 General remarks
1.3 Protection against mechanical hazards
1.5. Risks due to other hazard
1.6. Maintenance
1.7. Information
• The relevant technical documentations are compiled in accordance with part B of Annex VII
• We will transmit in case of a reasoned request by the national authorities the relevant technical documentation in
accordance with part B of Annex VII.
• The above mentioned relevant technical documentations can be obtained from The QC Department, SNR WAELZLAGER
GMBH, Friedrich-Hagemann-Straße 66, D-33719 Bielefeld, Germany
• The conformity is in accordance with the EN ISO 12100:2010 «Safety of machinery - General principles for design - Risk
assessment and risk reduction «
• The partly completed machinery must not be put into service, until the nal machinery, into which it is to be incorporated,
has been declared in conformity with the provisions of machinery directive 2006/42/EG if required.
2.1 Denition
2.2 Declaration of incorporation for partly completed machinery (Machinery directive 2006/42/EG)
POSITIONING
REPEATABILITY
When positioning repeatability, an arbitrary point is approached several times in one direction from the
same starting point and the deviation to the target value can be measured. The process is repeated
for different points. ± 50% of the difference between maximum and minimum deviation is given as
positioning repeatability.
POSITION ACCURACY
When measuring the positioning accuracy several points are approached in one direction and the
difference between target travel distance and actual travelled distance measured. The position accuracy
is the absolute maximum difference.
RUNNING
PARALLELISM
The dial gauge is centrally mounted on the carriage and moved over the complete stroke. The running
parallelism is the maximum difference between the measured values.
BACKLASH OF BALL
SCREWS
The slider unit is moved by the ball screw against a dial gauge as a reference point. Then, the carriage will
be loaded in the same direction by an external force and then unloaded. The backlash is the maximum
difference between the reference point and the position after loading and unloading.
STARTING TORQUE OF
BALL SCREWS
The starting torque is the required drive torque which is necessary to overcome the static friction of the
system and to start the motion.

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The device is built according to current state-of-
the-art technology and applicable regulations. The
device complies with the EU machinery directive,
harmonized standards, European standards
or the applicable national standards. This is
conrmed with a manufacturer’s declaration.
Relevant accident prevention regulations, generally accepted
safety-related rules, EU guidelines, other applicable standards
and country-specic regulations are also applicable.
Because linear units can be used in such a wide range of
applications, the ultimate responsibility and liability for appropriate
use lies with the end user.
This device creates an unavoidable residual risk for personal
injury and material damage. For this reason, every individual who
works on this device associated with the transport, assembly,
operating, maintenance and repair of the device, must receive
instruction and understand the potential dangers. The information
about mounting, start-up, maintenance and lubrication must be
understood and observed.
In addition, operating equipment poses a risk of injury due
to rotating or otherwise moving components. Due to moving
carriages, operational Linear Axis particularly pose an increased
crushing hazard, especially in connection with end position
dampers and limit switches. The user must carry out a detailed
machinery risk assessment to identify hazards to all operators with
signs or written codes of conduct which are compliant with any
local regulations. Alternatively, the user may eliminate or exclude
these residual risks to the greatest extent possible by employing
appropriate constructive measures.
The noise level can increase at high speeds, special applications
and at accumulation of more noise sources. The user must take
the appropriate protective measures.
Linear Axis start-up is prohibited until it can be established that
the machine or system in which it is mounted conforms to EU
machinery directives, harmonized standards, European standards
or applicable national standards.
NTN-SNR - Linear Axis and NTN-SNR- Linear tables are
fundamentally designated for linear movement as occurs during
positioning, synchronization, transport, palletizing, loading,
unloading, clamping, tightening, testing, measuring, handling
and manipulating components or tools. Type-specic load data
from the relevant catalogue documentation and/or NTN-SNR
supplementary technical calculations must be observed.
Furthermore, an operating temperature between –10°C to +75°C
must be adhered to.
Alternative or excessive use is considered improper use.
The manufacturer assumes no liability for resulting damages.
The user bears sole responsibility for all risks.
The Linear Axis may only be operated and serviced by individuals
familiar with the axis and who have been instructed in the dangers.
Special provisions can be made for applications (as example
food industry, clean room etc.) which deviate from the standard
modications.
2.5 Coordinate system
The Linear Axis can be loaded by forces or torques.
The coordinate system (Figure 2.1) shows the forces acting in
the main load directions, the torques as well as the six degrees
of freedom.
Forces in the main load directions:
FX Movement force (X-direction)
FY Tangential load (Y-direction)
FZ Radial load (Z-direction)
Moments:
MX Torque in roll direction (rotation around the X-axis)
MY Torque in pitch direction (rotation around the Y-axis)
MZ Torque in yaw direction (rotation around the Z-axis)
2.3 Safety instructions
2.4 Intended use
Figure 2.1 ___ Coordinate system

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2.6 Static load capacity
The values of the static load capacity given in the data tables of
the Linear Axis (except AXBG) represent the maximum load that
can be applied.
The loads (radial and tangential) and moments can act
simultaneously from different directions on the Linear Axis
(Figure 2.2).
In this case, a maximum equivalent load, consisting of radial,
tangential and other loads, used for verication. For this, the
position must be located within the movement cycle in which the
combination of all loads has the maximum value.
For complex loads, we recommend to contact our NTN-SNR
application engineers.
A minimum safety factor for static load capacity is not given here.
The static load capacity should not be mixed up with the static
load rating that is specied in calculation of linear guides. Only for
the axis of the series AXBG the static safety is to be determined
because the loads affect here on the carriages directly.
The static load capacity of a Linear Axis results from the maximum
load capacity of all related components in their interaction and is
lower than the static load rating of the guiding system.
An additional check the static safety of the guiding system is not
necessary.
If a Linear Axis is subjected in static alternating loads use, the
values of the dynamic load capacity shall be recognized as the
maximum values.
2.7 Life time
2.7.1 Dynamic load capacity / Nominal life time
The catalogue data to the dynamic load capacity of the Linear Axis
(except AXBG) based on the nominal life time of 50,000 km for
toothed belt axis, of 25,000 km for screw drive axis and of 10,000
km for Linear Axis with polymer track roller guides. The change of
the nominal lifetime depending on the load is shown in Figure 2.3.
If the loads are lower than the described limits, no further
investigation is necessary.
If the nominal life time of the Linear Axis should be calculated,
the calculation basics for linear guides, ball screws, racks and
track rollers, which are described in the relevant catalogue, must
be applied.
For Linear Axis of the AXBG series this calculation rules are always
applicable.
In case of higher dynamic loads, please contact at on our NTN-SNR application engineers or use for complex loads our calculation
service.
2.7.2 Inuence factors
For a calculation of the nominal life, it is often very difcult, to determine the real acting loads exactly.
• Linear Axis are usually subject to oscillations or vibrations caused by the process or driving forces.
• Linear Axis are to be dimensioned so that the load peaks of shocks do not exceed the maximum permissible loads.
This applies to the dynamic and the static state of the system.
Toothed belt axis / Rack
and pinion axis
Screw drive axis
Linear Axis with polymer
track roller guides
Figure 2.3___ Nominal life time
FEFZ
FY
Figure 2.2___ Equivalent load
50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
100 000
90 000
80 000
70 000
60 000
50 000
40 000
30 000
20 000
10 000
0
Dynamic load capacity [%]
Nominal life time [km]

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2.8 Rigidity
The rigidity of a Linear Axis is specied by the corelation between the external load and the resulting elastic deformation in the load
direction.
The rigidity is an important parameter for the selection of the Linear Axis because the rigidity values are changing depending on the type
and version of the NTN-SNR - Linear Axis. Essentially, the rigidity of the Linear Axis is determined by the rigidity of the aluminum prole.
The total deformation of a system still depends on the following external factors:
• Kind of the loads (point loads, line loads or moment loads)
• Kind of the xation of the Linear Axis
• Length of the Linear Axis
• Distance of the fastening points
Some examples of calculation of the bending of the Linear Axis are shown in Table 2.1.
Table 2.1____ Bending of Linear Axis
Kind of bearing Kind of load Specication Bending Bending angle
Support - Support Point load
Fixed - Fixed Point load
Support - Support Line load
Fixed - Fixed Line load
Fixed - Free Point load
Fixed - Free Line load
Support - Support Moment load
Fixed - Fixed Moment load
EI
Pl
48
3
max =
δ
EI
Pl
192
3
max =
δ
EI
pl
384
54
max =
δ
EI
pl
384
4
max
=
δ
EI
Pl
3
3
max =
δ
EI
pl
8
4
max
= δ
EI
Ml
216
3
2
max
= δ
EI
Ml
216
2
max =
δ
EI
Pl
16
tan
2
2=
α
0
1
=
α
0
2=
α
EI
pl
24
tan
3
2=
α
0
2=
α
EI
Pl
2
tan
2
1=
α
0
2=
α
EI
pl
6
tan
3
1
= α
0
2=
α
EI
Ml
12
tan
1
= α
EI
Ml
24
tan
2
= α
EI
Ml
16
tan 1=
α
0tan 2= α
0
1
=
α