www.vardhmanbearings.com
we are importers and stockiest and exporters of star make rexroth bosch rexroth bearings and guide ways
Tychoway Linear Roller Bearings
The Drive and Control Company2 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
www.boschrexroth-us.com
Ball Rail Systems
Ball Screw Drives Basic Mechanical Elements
Roller Rail Systems Linear Bushings and Shafts
Linear Motion Systems
Manual Production Systems Assembly Conveyors VarioFlow ConveyorsRA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 3
Product Overview 4
Design Features 5
Typical Applications 6
Mounting Arrangements 7
Tychoway Inch Series 8
Tychoway Metric Series 9
Spring Pad/Options 10
Tycho-Gibb Options 11
Rails 12
Installation 13
Preload 14
Life Calculations 15
Operating Data 16
Test Data 17
Linear Roller Bearings4 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Tychoway Linear Roller Bearings
The extremely low friction of Tychoway Linear Roller Bearings enables them to provide very accurate
positioning in machine slides by virtually eliminating the stick-slip phenomenon. The combination of
positioning and travel accuracy benefi ts afforded by Tychoway Linear roller Bearings meet the world‘s
toughest competition.
Tychoway recirculating Linear Roller Bearings provide predictable, repeatable positioning accuracy with
minimum service requirements. A diverse range of sizes allows use in applications from compact dies
to large machine tools. Tychoway Bearings have static load capacities rated from 4,330 to 122,000
lbs. The smallest bearing, only 0.56 inches wide, can be mounted in very compact assemblies. Larger
sizes are used in machine tools, paper machinery and other heavy equipment.
– Made in the USA by skilled American machinists
– Special Buna band gives continuous guidance to the rollers,
minimizing roller skew
– Made of high-quality, high carbon
alloy bearing steel
– Hardened to 60 Rockwell C minimum to insure high capacity and
long life
– High race radius to roller diameter ratio enhances roller recirculation and minimized friction,
eliminating stick-slip forces
– Low friction rolling element design
provides a system coeffi cient of
friction of .005 or better for most
applications
– Open load zone design provides
space for contaminants to be
forced away from the roller pathRA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 5
Applications
Tychoway Linear Roller Bearings are used in a wide variety of applications. A choice of styles and sizes
provide the special machine builder and OEM designer fl exibility in bearing selection. Straightforward
installation methods reduce time in assembly and fi nal machine adjustments.
Machine Tools
– Machining centers
– Slant bed turning machines
– Traveling column milling machines
– Reciprocating surface grinders
– Automatic drilling machines
– CNC turret lathes
– Friction welders
Lasers and EDM
– Laser cutting
– Automatic welding machines
– Electric discharge machines
Special Applications
– Aircraft assembly gantries
– Siesmic testing equipment
– Can production equipment6 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Mounting Arrangements
Horizontal or Vertical
Horizontal Gravity Loaded
Ram Support
This arrangement provides
complete anti-friction support in
all planes, as well as resistance
to moment loading. Preloading
permits low friction movement
without looseness in the assembly. The opposed bearings can
be mounted on Tychoway Spring
Pads for a preset dynamic
preload or on Tycho-Gibbs for
maximum stiffness.
This arrangement provides economical design where no uplift
loads are present. It is used in
a horizontal plane with gravity
preload on the main load carrying bearings. A design popular
in grinder and general purpose
slides, the guide bearings can
be preloaded with a Tychoway
Spring Pad or a Tycho-Gibbs for
maximum stiffness.
This bearing arrangement is ideal
for vertical or horizontal rams,
providing low friction motion with
no looseness in the assembly.
The opposed bearing should be
preloaded with Tycho-Gibbs for
maximum stiffness.RA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 7
Original Tychoway
Inch Series
Tycho II Inch Series
Linear Roller Bearings
* NOTE: Buna band equipped Tychoway Bearings are recommended. Metal clips are available as an alternate and are advantageous in certain applications.
See page 9
2.00
2.88
4.00
5.50
8.12
11.00
0.5625
0.5622
0.7500
0.7497
1.1250
1.1247
1.5000
1.4997
2.2500
2.2497
3.0000
2.9997
0.875
0.873
1.000
0.998
1.500
1.498
2.000
1.997
3.000
2.297
4.000
3.996
1.12
1.50
2.25
3.00
4.50
6.00
0.450
0.600
0.900
1.200
1.800
2.400
0.150
0.200
0.300
0.400
0.600
0.800
0.750
1.000
1.500
2.000
3.000
4.000
0.672
0.812
1.219
1.625
2.437
3.250
No. 4
No. 4
No. 8
No. 10
0.25
0.31
4,330
7,920
17,260
29,460
68,200
122,000
2,220
4,240
9,830
17,750
43,300
81,000
3.2 x 10
5.1 10
7.0 x 10
9.5 x 10
15.3 x 10
19.1 x 10
6
Inches
Height
A
Width
B
Length
C
Effect.
Length
D
inches
Effect.
Width
E
inches
Roller
Dia.
F
inches
Mounting Dim.
G+.002 H+.002
S.H.C.S.
Size
J
Load Rating
Static
C lb.
Dynamic
C lb. 0
Stiffness
lb/inch
0.2
0.5
1.3
3.3
11.0
25.0
App.
Weight
lb.
R987144779
R987144824
R987144863
R987144726
R987144874
R987144765
Part
Number
Old Part
Number
21050
21100
21150
21200
21250
21300
Buna
Band
2.00
2.88
4.00
5.50
8.12
0.5625
0.5622
0.7500
0.7497
1.1250
1.1247
1.5000
1.4997
2.2500
2.2497
0.875
0.873
1.000
0.998
1.500
1.498
2.000
1.997
3.000
2 297
1.12
1.50
2.25
3.00
4.50
0.450
0.600
0.900
1.200
1.800
0.150
0.200
0.300
0.400
0.600
0.750
1.000
1.500
2.000
3.000
0.672
0.812
1.219
1.625
2.437
No. 4
No. 4
No. 8
No. 10
0.25
4,330
7,920
17,260
29,460
68,200
2,220
4,240
9,830
17,750
43,300
3.2 x 10
5.1 10
7.0 x 10
9.5 x 10
15.3 x 10
Inches
Height
A
Width
B
Length
C
Effect.
Length
D
inches
Effect.
Width
E
inches
Roller
Dia.
F
inches
Mounting Dim.
G+.002 H+.002
S.H.C.S.
Size
J
Load Rating
Static
C lb.
Dynamic
C lb. 0
Stiffness
lb/inch
0.2
0.5
1.3
3.3
11.0
App.
Weight
lb.
R987144780
R987144795
R987144866
R987144720
R987144746
Part
Number
Old Part
Number
21080
21130
21180
21230
21280
Metal
Clip
6
6
6
6
6
6
6
6
6
6
7.87
11.0
2.2500
2.2497
3.0000
2.9997
3.000
2.997
4.000
3.996
4.63
6.44
1.643
2.334
0.551
0.787
3.000
4.000
2.437
3.250
0.25
0.31
77,260
170,720
45,700
99,130
2.01 x 10
3.15 x 10
6
6
Inches
Height
A
Width
B
Length
C
Effect.
Length
D
inches
Effect.
Width
E
inches
Roller
Dia.
F
inches
Mounting Dim.
G+.002 H+.002
S.H.C.S.
Size
J
Load Rating
Static
C lb.
Dynamic
C lb. 0
Stiffness
lb/inch
13.3
33.0
App.
Weight
lb.
R987144742
R987144704
Part
Number
Old Part
Number
31250
31300
Description
#18 TYCHO II
BEARING
#24 TYCHO II
BEARING8 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Spring Pad for Dynamic
Preload
Spring Pad/Options
*CAUTION - Do not use spring pad if the working load on the spring-mounted bearing exceeds installed spring load indicated above.
** Use only screw length J for fastening bearing to spring pad. Do not use longer screws.
Free
Height Spring
Washers
21905
21910
21915
21920
21925
.408
.398
.480
.470
.539
.529
.665
.655
.868
.858
.390
.385
.454
.447
.517
.510
.641
.635
.832
.822
0.375
0.437
0.500
0.625
0.812
370 lb
600 lb
1500 lb
2700 lb
5050 lb
2.62
3.75
4.75
6.25
8.75
2.00
2.50
3.25
4.50
6.50
No. 8
No. 8
No. 8
No. 10
0.25
Description Use with
Bearing Part #
Recommended
installed
Free
height
A
Height *Spring
load
Solid
height
Width
B
S.H.C.S.
Size
J
Mounting Dimensions
200 lb
250 lb
400 lb
500 lb
800 lb
1060 lb
1600 lb
2000 lb
3600 lb
4500 lb
Spring
load at
solid
height
Length
C D E F G H L
0.84
0.97
1.47
1.97
2.97
0.16
0.16
0.16
0.19
0.31
2.3125
3.4375
4.4375
5.875
8.125
--
--
0.234
0.172
0.266
--
--
1.000
1.625
2.437
0.42
0.48
--
--
--
S.H.C.S.
Size
K
#4-40
0.62" long
#4-40
0.75" long
#8-32
1.00" long
#10-32
1.50" long
#25-20
2.00" long
Part
Number
R987144775
R987144812
R987144853
R987144715
R987144736
Old Part
Number
#4 Spring
Pad
#6 Spring Pad
Assembly
#9 Spring Pad
Assembly
#12 Spring Pad
Assembly
#18 Spring
Pad
R987144779
R987144824
R987144863
R987144726
R987144874RA 99 001 (2009.04) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 9
Tycho-Gibb/Options
Matched height bearings
Matched height Tychoway
bearings are for use in height
dimension critical applications.
The term matched indicates the
tightened tolerance of height
dimension A in comparison with
standard bearings. All other
dimensions remain standard.
Part numbers for matched
height Inch Series bearings are
listed in the table.
Metal clip bearings
These bearings use metal clips
for roller retention and are suited
for high temperature applications.
Metal clip bearings are dimensionally identical to standard
Tychoway bearings.
See page 7 for specifi cations
and part numbers.
Tycho-Gibb for static preload
and height adjustment
0.6467
1.0030
1.1998
R987144824
R987144863
R987144726
Assembly
Part # Bearing
Size
A
R987144821
R987144861
R987148889
A B E C D F G H J K L M N P
0.6329
0.9873
1.1841
0.0138
0.0157
0.0157
1 2
0.276
0.315
0.315
3.068
4.410
5.550
2.441
3.540
4.528
1.000
1.500
2.000
0.812
1.279
1.625
0.990
1.480
1.980
4-40
8-32
10-32
0.65
0.90
1.10
1.071
1.484
1.951
8-32
10-32
5/16-18
4-40
10-32
1/4-28
0.812
1.219
1.625
Old
Part #
42100
42150
42200
Description
#6 TYCHO GIBB
#9 TYCHO GIBB
#12 TYCHO GIBB
21100
21150
21200
Old
Bearing
Size
Matched Height Bearings
Buna Band
Part #
Height “A”
in inches
R987144782
R987144819
R987144867
R987144712
R987144745
R987144766
#4 Tychoway
Match Bearing
#6 Tychoway
Match Bearing
#9 Tychoway
Match Bearing
#12 Tychoway
Match Bearing
#18 Tychoway
Match Bearing
#24 Tychoway
Match Bearing
0.562425
0.562375
0.749925
0.749875
1.124925
1.124875
1.499925
1.499875
2.249950
2.249850
2.999950
2.999850
Description
Buna Band
Old Part #
21058
21108
21158
21208
21258
21308
Metal Clip
Part #
Height “A”
in inches
R987144778
R987144819
R987144847
R987144719
R987144741
#4 Tychoway
#6 Tychoway
#9 Tychoway
#12 Tychoway
#18 Tychoway
0.562425
0.562375
0.749925
0.749875
1.124925
1.124875
1.499925
1.499875
2.249950
2.249850
Description
Metal Clip
Old Part #
21088
21138
21188
21238
2128810 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Recommended Rail Geometry
The rail surface on which the
Tychoway linear roller bearings
operate is one of the races of the
bearing system. Rexroth recommends steel rails hardened to 58
Rockwell C minimum. The graph
below indicates the effect of rail
hardness on the load capacity of
Tychoway linear roller bearings.
Hardened and ground rails for
assembly should be made with
the working surface hardened to
a minimum depth of .125“.
Typical shapes and sizes of rails
are shown at right. Special rails
with key-ways and shoulders for
more secure mounting are also
common. Please contact your
way manufacturer to ensure that
the specifi cations match these
recommendations.
Hardened
area (typ.)
B
A
Hardened
area (typ.)
B
A
Typical sizes, inches
B
2.000
2.750
3.500
4.500
4.000
5.000
4.500
6.500
6.000
A
1.000
1.375
1.500
1.500
2.000
2.000
2.500
2.500
3.000
Effect of Way Hardness on Load Capacity
Fh1 Hardness Factor
1.2
1.1
1.0
.9
.8
.7
.6
.5
Hardness—Rockwell C
60 58 56 54 52 50 RA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 11
Installation
Mounting accuracy
In order to attain the rated load
capacity and life for Tychoway
linear roller bearings, the following mounting accuracies and
alignments must be maintained
in installation.
Parallelism between
mounting surfaces
Uniformity of mounting height
Alignment in the direction
of travel
To assure uniform loading of the
bearings on the machine rail, the
surfaces to which the bearings
will be mounted should be parallel to the rail surface within .001“
per foot.
Bearing-to-bearing height measurement cannot be taken from the
bearing race surface. The total
height of each individual bearing
is the sum of the race height plus
the roller diameter. Measurement
must take the total height of the
bearing into consideration.
For standard bearings, the tolerance for total bearing height
(race height plus roller diameter)
is held to within .0003“. Matched
height bearing with a height
tolerance of + 0, - .000050“ are
available for applications where
accurate height measurements
are not easily attainable.
For most applications, this alignment should be within .001“/inch
measured along the side of the
bearing race. However, where
machine slide positioning accuracy of .0005“ or less is required,
a tolerance of .0002“/inch is
necessary.
NOTE: Design of the adjacent machine structures should allow for these tolerances
at the bearing.
Race
Height
(Correct Measurement) (Incorrect Measurement)
Total
Height
Indicator
Misalignment
Direction
of Travel
Standard .001”/inch
Precision .0002”/inch
Standard .001”/foot12 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Preload
Rexroth linear roller bearings allow
for straightforward installation.
Mounted in preloaded pairs, they
control the alignment and movement of machine elements within
extremely close tolerances.
The main reasons for preloading
are to eliminate looseness and
lift-off under loads and to increase the stiffness of the system.
Preload has the same effect on
bearing life as a working load
and therefore should be minimized. Recommended preload for
most machine tool applications
is 15% of the bearing‘s dynamic
capacity.
Desired preload is usually
established by determining the
required bearing defl ection. This
requires that components be
dimensioned so that the bearing
will be defl ected the desired
amount at fi nal assembly.
Preload can also be induced with
devices such as the Tycho-Gibb
or the Tychoway spring pad. These and other methods are detailed
on the following page.
With preload constructions,
the designer should take into
consideration the sequence of
fi nal assembly. Rexroth does
not recommend premounting
the bearings and the forcing the
assembly onto the machine rails,
as this may damage the bearings.
A design which allows the machine components to be bolted
together will usually simplify the
assembly procedure.
Preload can be checked by
measuring the force required
to move the well-aligned and
preloaded assembly. If the total
weight and preloads on the bearings are known, the theoretical
force required to move the table
can be calculated. An approximate
co-effi cient of friction for a Tychoway bearing system, including
wipers, is .005.
As an example of calculating
friction, consider a machine with
twelve Tychoway 21050 bearings
and a slide table weight of 2000
pounds. Stiffness per bearing
is 3.2 million pounds per inch,
and dynamic capacity is 2,220
pounds.
To induce a 15% preload each
bearing must be defl ected
approximately .0001 inches.
Defl ection is calculated by fi rst
multiplying the bearing dynamic
capacity by the preload percentage to obtain preload force.
Next, the stiffness rating is used
to determine the amount of
defl ection required to induce this
preload force.
In this example, a dynamic
capacity of 2,220 pounds multiplied by a .15 preload results
in a required preload force of
333 pounds. The stated bearing
stiffness rating indicates each
bearing must be defl ected .0001
inches, perpendicular to the
mounting surface.
Total system friction is the sum
of the preload induced friction.
With a .005 coeffi cient of friction, the bearings combine to
generate 20 pounds of friction
force. The 2000 pound table
weight generates 10 pounds
friction force. Thus, total calculated friction force for this system,
without a working load applied,
is 30 pounds.RA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 13
Preload Methods
The method used for preloading
Tychoway® Roller Bearings is a function of the overall machine design.
Mounting design is fl exible to the
extent that the bearing contacts the
rail within Rexroth‘s stated limits of
accuracy and parallelism (see page
12). Some common methods of preloading are shown below.
With a Tycho-Gibb
With a Spring Pad
Directly to Machine
With a Shim Plate
With an Adjustable Pad
The Tycho-Gibb may be used for
solid preload or height adjustment
of Rexroth Tychoway bearings. It
consists of two precision-ground
wedges guided by a central key
with a fi xed plate at one end to
support the adjusting and locking
screws. A lubrication port in the
Tycho-Gibb allows lubrication of
the rolling elements of the bearing through the return zone. The
Tycho-Gibb offers the following
advantages over other mounting
techniques: solid preload adjustability, height compensation and
adjustment for resurfacing of rails.
The Spring Pad is self-compensating and does not require the precision demanded by fi xed mountings.
It is useful in applications where the
imposed load does not exceed the
spring preload and offers some fl exibility in the pitch and roll rotation axes.
This method requires high precision
machining. Cumulative tolerance
errors must be considered.
This method permits accurate dimensional control through fi nal machining
of the shim plate which should be
mild to medium carbon steel with a
compressive yield strength of at least
50,000 psi and be at least 1/8“ thick.
This method eliminates the need for
accurate machining of the mounting
surfaces. Final adjustments may
be quite sensitive, but can provide
one or more degrees of freedom for
alignment.
NOTE: The Tycho-Gibb and Spring Pad are designed for use with inch series Rexroth Tychoway bearings. Each
product offers the fl exibility of preload and machining techniques over the following conventional methods.14 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Life Calculations
Life
Load capacity ratings for Rexroth
Tychoway® Linear Roller Bearings
are given in the Specifi cations
Section. With these ratings and the
use of the service life calculations,
machine designers can select the
required bearings.
Bearing Life Factors
Dynamic Load Capacity (C)*
Rail Hardness Factor (Fh)
Temperature Factor (Ft)
Service life for Tychoway bearings
is affected by rail hardness. Load
capacity ratings for the bearings assume a rail hardness of 58
Rockwell C, minimum depth .0125“.
Though not recommended, use of
rails hardened to a lesser degree
decreases bearing service life. A capacity correction chart in the “Rails”
section provides the Rail Hardness
Factor (Fh) for dynamic and static
load capacities.
The service life equations consider
load, rail hardness and temperature
factors. L10 life is the 90% probability life based on the rated dynamic
capacity.
When the same model of standard
Tychoway bearings with Buna band
are operated individually under
identical load and operating conditions, and 90% of them can run for 30
million inches with material damage
by rolling fatigue, the total applied
bearing load is the rated Dynamic
Load Capacity. The capacity is based
on 10 million inches travel for the
Metal Clip and Metric Series.
L10 = Basic rating life in inches of travel
C = Dynamic load capacity, lbf (kN)
Pc = Calculated normal load, lbf (kN)
Ft = Temperature factor
Fh = Rail hardness factor
These formulae assume normal operating conditions and an evenly applied
load normal to the bearing.
For Buna Banded and Tycho II bearings
For Metal clip and Metric bearings
Bearing capacity of materials
changes inversely with temperature.
The graph gives the percentage of
bearing capacity retained at various temperatures com-pared to a
bearing having a minimum hardness
of 60 Rockwell C at room temperature, The Temperature Factor F1 is
used in the service life calculation.RA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 15
Life Calculations
Static Load Capacity (CO)*
Static Load capacity for Rexroth
Tychoway®
Bearings is given in
the Specifi cations Section. These
ratings are defi ned as the load at
which a permanent deformation of
the bearing races takes place, equal
to 1/10,000 of the roller diameter.
If vibrations or impacts are present
when the bearings are static, the
Static Impact and Vibration Factor
(S1
) should be used to adjust the
Static Load Capacity (CO).
Static Impact and Vibration
Factor (FS)
The Static Load capacity of Rexroth
Tychoway®
Bearings may need to
be adjusted according to conditions. In application where impacts
or vibrations are present, the static
Load Capacity should be multiplied
by the Static Load Factor (FS) to
obtain the Adjusted Static Load
Capacity (CO’). The equation shown
on the right should be used to determine the adjusted static capacity for
your application.
Note on Bearing Life
The service life equations provide a
good approximation of bearing life.
However, bearing life is diffi cult to
predict due to factors other than
those considered in the equation, such as those listed. Rexroth
recommendations for these factors
are discussed in other sections of
this catalog. If additional information
is required, please contact us.
• Lubrication of the rolling elements
• Contamination of the rolling elements
• High speeds and accelerations
• Stiffness of other machine components
• Accuracy of machine ways
NOTE: * Static and dynamic capacities and life calculations are based on standards established by the American National Standards Institute (ANSI) and Anti-Friction
Manufacturers‘ Association (ABMA).
CO’ = CO • FS
CO’ = Adjusted Static Load Capacity
CO = Basic Static Load Capacity
FS = Static Load Factor
Static Impact and Vibration Factors
Static Conditions Static Factor FS
No vibration or impact 0.78 - 1.00
Slight to moderate vibration 0.56 - 0.78
Heavy vibration or impact 0.43 - 0.56
To calculate bearing service life for a model 21100
standard bearing, use the 30 million inch service life
equation for Buna band and Tych II bearings. Assume
a Temperature Factor and Rail Hardness Factor of 1.0
(100%).
Let: Load PC = 2100 lbs.
Dynamic Capacity of 21100 brg. = 4240 lbs.
L10 = • 30 • 10
6
L10 = 310 • 10
6
inches
4240 • 1.0 • 1.0
( ) 2100
10
316 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
Operation Data
Lubrication
Rexroth Tychoway®
Bearings
generally require only a mini-mum
amount of lubrication unless
speeds are relatively high and
operation continuous. The lubricant must be kept perfectly clean,
as a very small amount of contamination can seriously damage
the bearings or rails.
Standard lubrication is light machine oil with a viscosity rating of
135 to 165 SSU at 100°F. Each
bearing should be supplied 1.0
cc of oil per hour under normal
operating conditions. Rexroth recommends automatic lubrication
systems for most applications.
The lubrication also helps prevent
the bearings from corroding. If
machine operation is infrequent,
the bearing assembly should
still be adequately lubricated to
prevent corrosion. It is highly
recommended that all coolants
that come into contact with the
bearings contain rust inhibitors.
Coolants should be checked to
assure that they do not attack
the bearing wiper systems as the
contaminants introduced may
cause bearing failure.
Covers and Wipers
In all bearing applications, the
rolling area must be protected
against contamination. Therefore, provisions should be
made for keeping the bearing
assembly perfectly clean or
serious damage can occur.
Common contaminants include
material chips from machining,
coolants carrying grinding dust
and airborne debris. Dirt, particularly of a hard and abrasive
nature, can cause serious damage to rolling element bearings.
Standard rail wipers may suffi ce
for keeping contamination out of
the bearing‘s roller path, however,
bellows or metal covers are recommended by Rexroth for more
positive protection.
Operating Temperatures
Standard Tychoway bearings with
the Buna Stabilizer Band and
Metric Series Bearings should
be operated in temperatures less
than 175°F. For temperatures
greater than this, the Inch Series
Metal Clip model is recommended for its all-steel construction.
See the Life Calculation section
for the effects of elevated temperatures on bearing capacity and
life.
Rexroth‘s lubrication recommendations for normal operating conditions
are defi ned as:
• Bearing loads not exceeding
their rated dynamic capacities
• Linear speed not in excess of
1200 inches per minute; linear
accelerations not in excess of 10g
• Bearings properly protected
from contamination
• Operating temperatures not in
excess of 175°F.
Consult Rexroth if unusual loading
or environmental conditions are
anticipated.RA 99 001 (2009.02) Tychoway Bosch Rexroth Corp. Linear Motion and Assembly Technologies 17
Test Data
Defl ection Test
Stiffness per bearing ratings are
given in the Specifi cations Section and are used to calculate
machine defl ection and preload
forces. Tychoway®
stiff-ness
ratings were determined through
defl ection tests and represent an
average over a range of loads.
The results shown here were conducted by an independent agency, Robert W. Hunt Co. Testing
Laboratory. Defl ection test results
for the 21250 Buna Stabilizer
Band bearing are shown as an
example.
10,000
20,000
30,000
40,000
50,000
60,000
70,000
0.00073
0.00173
0.00204
0.00270
0.00332
0.00393
0.00457
Load in lbs. Deflection in inches
Deflection of 21250 Bearing
Metal-to-Metal Ways
400 lb.
Force
Tychoway bearings
5 lb.
Force
Metal Clip
Buna Band
0.0011 - 0.0025
0.0018 - 0.0031
0.0023 - 0.0037
0.0040 - 0.0044
0.0012 - 0.0017
0.0011 - 0.0013
Bearing Type % of Rated Coefficient
Load of Friction
Starting and Operating Coefficient
15%
45%
75%
15%
45%
75%
Tychoway®
Linear Roller Bearings operate with a much lower
coeffi cient of friction than traditional metal-to-metal ways. This
allows the use of lighter duty drive mechanisms, such as motors
and ballscrews. Thus, machines
based on Tychoway bearings can
be more economical and have a
longer service life.
Tests of Tychoway bearings at
different preloads indicate that
the coeffi cient of friction varies
with load. A realistic co-effi cient
of applied friction for a machine
system, including wipers, would
be approximately .005.
The reverse pattern of coeffi cients for the two types of bearings is noteworthy. The higher
coeffi cient of the Buna banded
bearing at light loads is due
to some interaction of the rollers from the band tension and
some drag friction. As the load
increases, the rollers are more
effectively separated when they
enter the load zone and rolling
action takes place.
Excessive misalignment of offset
loading can increase the coeffi cient. This occurs primarily on the
metal clip bearing though mounting inaccuracy of any bearing
creates higher friction.
Defl ection Test18 Bosch Rexroth Corp. Linear Motion and Assembly Technologies Tychoway RA 99 001 (2009.02)
NotesQuantity Order of: ______ pcs, ______ per month, _______ per year, per order, or ____________________________
Comments:
______________________________________________________________________________________________________________
From
Company: ___________________________________ Name: ________________________________________________
Address: ____________________________________ Department: __________________________________________
_____________________________________________ Telephone: ____________________________________________
_____________________________________________ Telefax: _______________________________________________
Phone: (704) 583-4338
800-438-5983
Fax: (704) 583-0523
www.boschrexroth-us.com
Bosch Rexroth Corporation
14001 South Lakes Drive
Charlotte, NC 28273
R987144778 #4 TYCHOWAY MATCHED CLIP BEARING 21088
R987144779 #4 TYCHOWAY BEARING 21050
R987144780 #4 TYCHOWAY CLIP BEARING 21080
R987144795 #6 TYCHOWAY CLIP BEARING 21130
R987144819 #6 TYCHOWAY MATCHED CLIP BEARING 21138
R987144824 #6 TYCHOWAY BEARING 21100
R987144825 #6 TYCHOWAY MATCHED BEARING 21108
R987144826 #6 TYCHOWAY BEARING W/LUBE OPENING 21100-LB
R987144847 #9 TYCHOWAY MATCHED CLIP BEARING 21188
R987144863 #9 TYCHOWAY BEARING 21150
R987144865 #9 TYCHOWAY BEARING w/LUBE OPENING 21150-LB
R987144866 #9 TYCHOWAY CLIP BEARING 21180
R987144867 #9 TYCHOWAY MATCHED BEARING 21158
R987144870 #9 TYCHOWAY BEARING W/STEEL END CAPS 21190
R987144712 #12 TYCHOWAY MATCHED BEARING 21208
R987144719 #12 TYCHOWAY MATCHED CLIP BEARING 21238
R987144720 #12 TYCHOWAY CLIP BEARING 21230
R987144726 #12 TYCHOWAY BEARING 21200
R987144731 #18 TYCHO II MATCHED BEARING 31258
R987144874 #18 TYCHOWAY BEARING 21250
R987144741 #18 TYCHOWAY MATCHED CLIP BEARING 21288
R987144745 #18 TYCHOWAY MATCHED BEARING 21258
R987144746 #18 TYCHOWAY CLIP BEARING 21280
R987144759 #24 TYCHOWAY CLIP BEARING 21330
R987144765 #24 TYCHOWAY BEARING 21300
R987144704 #24 TYCHO II BEARING 31300
R987144817 #6 SUPERWAY BEARING 21100S
R987144818 #6 TURCITE BEARING (SUPERWAY) 31110-TB-01
R987144859 #9 SUPERWAY TRUCK BEARING 21150S
R987144853 #9 SPRING PAD 21915
Part # Description Version QtyBosch Rexroth Corporation
Corporate Headquarters
5150 Prairie Stone Parkway
Hoffman Estates, IL 60192-3707
Telephone (847) 645-3600
Facsimile (847) 645-6201
Bosch Rexroth Corporation
Industrial Hydraulics
2315 City Line Road
Bethlehem, PA 18017-2131
Telephone (610) 694-8300
Facsimile (610) 694-8467
Bosch Rexroth Corporation
Electric Drives and Controls
5150 Prairie Stone Parkway
Hoffman Estates, IL 60192-3707
Telephone (847) 645-3600
Facsimile (847) 645-6201
Bosch Rexroth Corporation
Pneumatics
1953 Mercer Road
Lexington, KY 40511-1021
Telephone (859) 254-8031
Facsimile (859) 281-3491
Bosch Rexroth Corporation
Mobile Hydraulics
1700 Old Mansfield Road
Wooster, OH 44691-0394
Telephone (330) 263-3300
Facsimile (330) 263-3333
RA 99 001
Printed in the United States
Bosch Rexroth Corporation
Linear Motion and
Assembly Technologies
14001 South Lakes Drive
Charlotte, NC 28273
Telephone (800) 438-5983
Facsimile (704) 583-0523
www.boschrexroth-us.com
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