DualVee Motion Technology - teausa.net · Krytox GPL 227 is a DuPont product. Alvania # 2 is a...
Transcript of DualVee Motion Technology - teausa.net · Krytox GPL 227 is a DuPont product. Alvania # 2 is a...
315
• ®The DualVee system exhibits up to 50% lower noise than round or square rail re-circulating ball guides (circular
raceway design vs. sharp 180° end cap returns).
Lubricators
® DualVee
Single Edge Track
with Patented
Mounting Shoulder
Bushings
®DualVee Motion TechnologyThe flexibility and simplicity in design offers infinite number of design possibilities with components easy to understand.
•Speeds in excess of 5.5 metres per second and accelerations in excess of 5 g's can be achieved due to a
circular raceway design and retained ball bearing construction.
•Inherent surface velocity gradient along the rolling contact area sweeps debris aside. ® DualVee is predominant antifriction bearing technology for use in contaminated environments.
•Butt joining of track is easily accomplished and provides for virtually unlimited stroke lengths.
• ®The DualVee system has the lowest installed cost (no ground surfaces required); N grade accuracies are
achievable with machine reference edges.
•••
Installation is simple, fit up adjustment is accomplished via simple rotation of eccentric guide wheels.
Lubricators and wheel covers allow for long re-lubrication intervals. ®DualVee is operable without lubrication in applications where the use of grease or oil is prohibitive.
•All sizes of track, wheels and bushings are generally in stock.
® DualVee Carriage Plate
Assembly
Track Base
Wheel Covers
® DualVee Guide Wheels
Typical Mountings
W0X 14.83 4.00 6.35 5.94 9.12 52100 52100 52100 304 A591 NBR Alvania 2
(0.584) (0.1575) (0.250) (0.234) (0.359)
W1X 19.58 4.76 7.87 7.95 11.89 52100 52100 52100 Nylon 66 A591 NBR Alvania 2
(0.771) (0.1875) (0.310) (0.313) (0.468)
W2X 30.73 9.53 11.13 12.70 18.26 52100 52100 52100 Nylon 66 A591 NBR Alvania 2
(1.210) (0.3750) (0.438) (0.500) (0.719)
W3X 45.80 12.00 15.88 19.05 27.00 52100 52100 52100 Nylon 66 A591 NBR Alvania 2
(1.803) (0.4724) (0.625) (0.750) (1.063)
W4X 59.94 15.00 19.05 25.40 34.92 52100 52100 52100 Nylon 66 A591 NBR Alvania 2
(2.360) (0.5906) (0.750) (1.000) (1.375)
W4XXL 75.39 22.00 25.40 31.75 44.45
(2.968) (0.8661) (1.000) (1.250) (1.750)
W1SSX 19.58 4.76 7.87 7.95 11.89 440C 440C 440C Nylon 66 304 NBR Alvania 2
(0.771) (0.1875) (0.310) (0.313) (0.468)
W2SSX 30.73 9.53 11.13 12.70 18.26 440C 440C 440C Nylon 66 304 NBR Alvania 2
(1.210) (0.3750) (0.438) (0.500) (0.719)
W3SSX 45.80 12.00 15.88 19.05 27.00 440C 440C 440C Nylon 66 304 NBR Alvania 2
(1.803) (0.4724) (0.625) (0.750) (1.063)
W4SSX 59.94 15.00 19.05 25.40 34.92 440C 440C 440C Nylon 66 304 NBR Alvania 2
(2.360) (0.5906) (0.750) (1.000) (1.375)
W4SSXXL 75.39 22.00 25.40 31.75 44.45 440C 440C 440C Nylon 66 304 NBR Alvania 2
(2.968) (0.8661) (1.000) (1.250) (1.750)9, 10W1SS227 19.58 4.76 7.87 7.95 11.89 440C 440C 440C 304 304 None Krytox227
(0.771) (0.1875) (0.310) (0.313) (0.468)9, 10W2SS227 30.73 9.53 11.13 12.70 18.26 440C 440C 440C 304 304 None Krytox227
(1.210) (0.3750) (0.438) (0.500) (0.719)9, 10W3SS227 45.80 12.00 15.88 19.05 27.00 440C 440C 440C 304 304 None Krytox227
(1.803) (0.4724) (0.625) (0.750) (1.063)10W4SS227 59.94 15.00 19.05 25.40 34.92 440C 440C 440C 304 304 None Krytox227
(2.360) (0.5906) (0.750) (1.000) (1.375)
52100 52100 52100 Nylon 66 A591 NBR Alvania 2
Guide Wheel Dimensions & Materials
Notes: 1. "A591"shield material (JIS SECC) is cold rolled carbon steel with electrolytic zinc coating (classified by ASTM A591). "304" reflects 304 stainless steel. 2. "NBR" seal material is nitrile butadiene rubber. 3. All dimensions are in mm & (inches). 4. Bore ID tolerance is +.0000, -.0003 inch, except W4XL. 5. W4XL Bore ID tolerance is +.0000, -.0004 inch. 6. Width tolerance is +.0000, -.0047 inch. 7. Krytox GPL 227 is a DuPont product. Alvania # 2 is a Shell Oil product. 8. "52100" reflects hardened AISI 52100 bearing steel (Rc 60-62); "440C" reflects hardened AISI 440C stainless steel (Rc 58-60). 9. High Temperature Compatible - Heat stabilized components allow for operating temperatures to 500°F.10. Clean Room Compatible - All stainless steel components are internally lubricated with Krytox GPL 227.11. Guide wheels are manufactured to ABEC class 5 tolerances.12. Weights: W1 - 12g, W2 - 40g, W3 - 136g, W4 - 285g.
All dimensions are subject to change without notice.
MDw OUTSIDE
MDw INSIDE
W
A B
90°
90°
60°
316
PartNumber
OutsideDiameter
A
BoreSize
4,5B
Width6W
InsideVee
RadiusMDwInside
OutsideVee
RadiusMDw
Outside
Outer8Race
Inner8Race
8Ball 1Retainer 1Shield 2Seal 7Grease
3,11 Dimensions in mm & (inches) Material
317
All dimensions are subject to change without notice.
Guide Wheels
MDw OUTSIDE
MDw INSIDE
W
A B
90°
90°
60°
LA
LR
Notes:1. Sizing and selection should be based on working load capacity ratings according to the sizing guidelines presented in the technical reference section. See load/life relationship page 321.2. Working load capacities reflect lubricated wheel/track interface.3. W..X = steel version, W..XSS stainless steel version.4. Load Capacities for all versions of Guide Wheels see page 322.5. For Studded or Integral Studded Guide wheels please go so www.tea.net.au for further data and specifications.6. For Wheel Cover and Lubricator Assemblies please go so www.tea.net.au for further data and specifications.
Part Number Radial Load (N) Radial Load (lbf) Axial Load (N) Axial Load (lbf) Weight (g)
WDW2SSX 2420 544 400 89.9 37.8
WDW3SSX 5200 1169 580 130.4 128.3
a
a
Size Outside Diam. A Bore Size B Width W Inside Vee Outside Vee(+.0000, -.0003in) (+.0000, -.0047in) Radius MD Radius MDW W
2 30.73 (1.210) 9.53 (.3750) 11.13 (.438) 12.70 (.500) 18.26 (.719)
3 45.80 (1.803) 12.00 (.4724) 15.88 (.625) 19.05 (.750) 27.00 (1.063)
a
a
Washdown WheelsProven to extend life in harsh and extreme environments.FDA approved grease.AISI type 440C stainless steel balls and races.Unique outer shield and inner seal for exceptional protection from liquids and debris.Ideally suited for food and beverage applications, as well as high speed water jet cutting machinery.Use together with DualVee standard AISI 420 stainless steel track.
a
mm (inch)
PartNumber
W0 146 28 650 123
W1X (SS) 274 57 1220 252
W2X (SS) 596 141 2650 625
W3X (SS) 1326 382 5900 1701
W4X (SS) 2181 900 9700 4001
W4XXL 3215 1473 1430 6552
Radial Working Load Capacity
LRmax1, 2(lb )f
Load Capacity (lb )f Load Capacity (N)
Axial WorkingLoad Capacity
LAmax1, 2(lb )f
Radial WorkingLoad Capacity
LRmax2,3(N)
Axial WorkingLoad Capacity
LAmax2,3(N)
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Single Edge Track - Undrilled
DualVeeTrack
Part No.
• Easy installation/available from stock• Single edge design allows for flexible track pair spacing• Patented mounting shoulder allows for accurate positioning of Vee ways• Available from stock as induction hardened, polished and undrilled, AISI1045 carbon steel• Induction hardened track remains soft below the mounting shoulder, allowing for drilling or other machining • 420 stainless steel available on request• Can be easily butt-joined for stroke lengths exceeding maximum single piece lengths (4 mtrs)• Single edge track with drilled mounting holes available - please go to www.tea.net.au for further details and specifications. • Size 0 double edge track, drilled and undrilled available - please go to www.tea.net.au for further details and specifications.
MSC
MSD
VIRTUALAPEX
90°
W
H
MDT
MountingShoulderLocation
MDTmm (inch)
Width
Wmm (inch)
Height
Hmm (inch)
MountingShoulder toCentre Line
MSCmm (inch)
MountingShoulder
depthMSD
mm (inch)
Weight
Kg/m (lbs./ft)
T1 11.10 (0.437) 4.75 (0.187) 3.17 (0.125) 0.79 (0.031) 1.57 (0.062) 0.272 (0.183)
T2 15.87 (0.625) 6.35 (0.250) 4.75 (0.187) 0.79 (0.031) 2.39 (0.094) 0.510 (0.343)
T3 22.22 (0.875) 8.71 (0.343) 6.35 (0.250) 1.57 (0.062) 2.77 (0.109) 1.03 (0.690)
T4 26.97 (1.062) 11.10 (0.437) 7.92 (0.312) 2.36 (0.093) 3.17 (0.125) 1.64 (1.100)
Track available from stock to 4 metres cut to 500mm incrementsPlease advise exact length required at time of ordering, as there is a 5mm cutting wastage.
Ordering Example:T1-1000 represents a 1 metre length of hardened, carbon steel, size 1 trackT1-1000-SS represents a 1 metre length of stainless steel size 1 track
Notes:1. All dimensions are in mm and (inches).2. The overall length tolerance is ±1.6mm / ±1/16 inch.3. For non-standard track lengths or other non-standard options, contact TEA for quotation.4. Maximum single piece track lengths: hardened = 6.096 mtr, unhardened = 6.7056 mtr.
All dimensions are subject to change without notice.
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Bushings
Most sizes from stock (* Available on request)Notes:1. All dimensions are in mm for metric bushings, and inch dimensions for imperial bushings.2. Standard material 303 stainless steel.
®3. The bushing's outside diameter is designed to fit the corresponding size DualVee guide wheel. Outside diameter (OD) tolerance is +0.00mm, -0.01inch (.25mm)4. Part # X_ indicates eccentric (adjustable) bushing; rotation of eccentric allows fit up adjustment between track and guide wheels.5. All mounting information within this catalogue assumes a central position of the eccentric bushing, thus allowing wheel position adjustment from "+EC" to "-EC".6. Part # MB or B_ indicates concentric (stationary) bushing; Since concentrically mounted wheels have a fixed position, these bushings set the alignment of the carriage assembly to the rail. Concentrically mounted wheels should be configured to carry the majority of the load whenever possible.7. Head height (HH) tolerance is ±0.001 inch and ±0.03mm.8. Inside diameter (ID) tolerance is +0.002, -0.000 inch and +0.05mm -0.00mm.
• Rigidly affixes guide wheels to a mounting surface in a precise, orthogonal fashion• Material: 303 stainless steel• Concentric and eccentric configurations allow for fit up adjustment• Design calls for a fastener to pass through the bushing and the guide wheel, locking the elements into place against the mounting surface
Ø
Ø
Ø
Concentric (MB)
Ø
Ø
Eccentric (MBX)
Met
ric
Bush
ings
DualVeeSize
MB1 M4 - - 6.22 7.6 13.8 4.76 3.96 11.2
MBX1 M4 12 0.25 6.22 7.6 13.8 4.76 3.96 -
MB2 M6 - - 6.65 10.8 17.4 9.52 6.00 14.2
MBX2 M6 14 0.61 6.65 10.8 17.4 9.52 6.00 -
MB3 M8 - - 9.47 15.6 25.1 11.99 8.00 19.1
MBX3 M8 19 1.07 9.47 15.6 25.1 11.99 8.00 -
MB4 M10 - - 11.10 18.8 29.9 15.00 10.00 22.4
MBX4 M10 22 1.52 11.10 18.8 29.9 15.00 10.00 -
MB4XL M14 - - 14.35 25.1 39.5 21.97 14.00 31.8
MBX4XL M14 30 1.52 14.35 25.1 39.5 21.97 14.00 -
PartNumber
RecommendedFastener Size
HexSizeHS
OffsetEC
HeadHeight
7HH
LengthBodyLB
LengthOverall
LO
OutsideDiameter
3OD
InsideDiameter
8ID
HeadDiameter
HD
1
2
3
4
4XL *
B1 #6 - - 0.250 0.300 0.550 0.1873 0.140 0.44
BX1 #6 7/16 0.012 0.250 0.300 0.550 0.1873 0.138 -
B2 1/4 - - 0.281 0.425 0.706 0.3748 0.250 0.56
BX2 1/4 9/16 0.024 0.281 0.425 0.706 0.3748 0.250 -
B3 5/16 - - 0.375 0.615 0.990 0.4722 0.312 0.75
BX3 5/16 3/4 0.042 0.375 0.615 0.990 0.4722 0.312 -
B4 3/8 - - 0.437 0.740 1.177 0.5904 0.375 0.88
BX4 3/8 7/8 0.060 0.437 0.740 1.177 0.5904 0.375 -
B4XL 9/16 - - 0.565 0.990 1.555 0.8650 0.563 1.25
BX4XL 9/16 1 1/4 0.060 0.565 0.990 1.555 0.8650 0.563 -
1a
2
3
4
4XL *
Inch
Bus
hing
s
All dimensions are subject to change without notice.
Studded Guide Wheels - Thru Hole Style
DualVeeSize
SWAC1 W1
SWAC1X W1X
SWAC1SSX W1SSX
SWAC1SS227 W1SS227 1.00 0.2352 0.59 0.35 0.083 0.238
SWAE1 W1 (25.4mm) (5.97mm) (15.0mm) (8.9mm) (2.1mm) (6.0mm)
SWAE1X W1X 0.015
SWAE1SSX W1SSX (0.4mm)
SWAE1SS227 W1SS227
SWAC2 W2
SWAC2X W2X
SWAC2SSX W2SSX
SWAC2SS227 W2SS227 1.54 0.3926 0.98 0.59 0.104 0.323
SWAE2 W2 (39.1mm) (9.97mm) (24.9mm) (15.0mm) (2.6mm) (8.2mm)
SWAE2X W2X 0.024
SWAE2SSX W2SSX (0.6mm)
SWAE2SS227 W2SS227
Notes:1. Stud material is AISI 416 stainless steel.2. Journal Diameter (OD) Tolerance is +0.0000, -0.0007 (+0.00 mm, -0.02 mm).3. Shoulder Thickness (S) Tolerance is ± 0.001 (± 0.03 mm).4. Vee Height (VH) Tolerance is ± 0.002 (± 0.05 mm).5. Eccentricity (EC) Tolerance is ± 0.005 (± 0.13 mm). All mounting information in this catalogue assumes a central position of the
eccentric stud allowing adjustment from plus "EC" to minus "EC".6. Nuts are manufactured to DIN standard 934 (18-8 stainless steel).7. Washers are manufactured to DIN standard 125 (18-8 stainless steel).8. See guide wheel specifications for detailed data on wheels.9. See load/life discussion in the technical reference section for sizing and selection information (pages 229-232).
1
2
W
N
T
HSØ OD
N
JL JL
TL TL
SS
EC
HVHH VHHS
Ø OD
T
W
Concentric Stud Eccentric Stud
• DualVee guide wheels with integral stud and mounting hardware
• Easy installation
• Consolidates multiple components into one part
number, making procurement simple
• Available on request only
®
AssemblyPart
Number
GuideWheel
OffsetOverallLength
M6 x 1 12mm M6
M10 x 1.5 14mm M10
JournalDiameter
JournalLength
ThreadLength
ShoulderThickness
VeeHeight
HexSize
Nut &Washer
Thread
EC5
H OD2 JL TL T S
3VH
4HS N,W
6,7
All dimensions are in inches and (mm) unless otherwise stated
216
Lubricator Assemblies
LubricatorProfile
• Easy to install
• Dispenses a thin film of oil along the Vee way
• Lubricating properties increases load capacity
and service life
• Stainless steel lubricator housing
• Lubricator assemblies available on request
DualVeeSize
PartNumber
L
MountingHole
Spacing
MHS
Height
B
BodyLength
H
Width
W
VeeHeight
VH
FastenerHole
Location
FD
1 & 2StandardHeight(for use withstandard heightmetric bushings)
3 & 4
1.10 0.787 0.47 0.69 0.45 0.435 0.18 0.12
(28.0 mm) (20.0 mm) (12.0 mm) (17.5 mm) (11.4 mm) (11.0 mm) (4.6 mm) (3.0 mm)
1.84 1.339 0.84 1.20 0.74 0.753 0.29 0.17
(46.7 mm) (34.0 mm) (21.3 mm) (30.5 mm) (18.8 mm) (19.1 mm) (7.4 mm) (4.3 mm)
TL12A
TL34A
FD
H
B
L
MHS
FS
W
VH
S
W
OverallLength
FastenerHole SizeDiameter
FS
Notes:1. All dimensions in inches and (mm) unless otherwise stated.2. Lubricator housing material per specification ANSI 303, 304, or 316 stainless steel.3. Felt material is white, pure wool, per specification SAE F-10 or ASTM 9R1.4. Lubricators are supplied complete with socket head cap screws and washers (stainless steel).
PartNumber
TL12AStandardHeight
Hardware
LubricatorProfile
TL34A
Washer
W3
M2
M3
Fastener
S3
M3 x .5 x 6 mm
M4 x .7 x 8 mm
221
320
Mounting Dimensions / Formulas
®When fabricating a DualVee linear guide fromcomponentry, the following (formulae) areapplicable for mating carriage plate and trackplate designs:
®For sizes 1 through 4 DualVee single edge trackwith equivalent sized guide wheels:
• Inboard Mounting (See Figure 1): A = B + X• Outboard Mounting (See Figure 2): A = C - X• Exterior Mounting (See Figure 3): A = D - YA = hole centres for wheel plate
DualVeeSize
1
2
3
4
Notes:®1. Information above uses the same size DualVee track and
wheel except for size 4XL which uses W4XXL guide wheel with size T4 track.2. Side views shown only, length of wheel plates can be any length required.3. It is recommended that wheel plates be constructed with concentric bushings on one side of the plate and eccentric bushings on the opposing side.4. "D" dimension is to the theoretical sharp of the 90°angle.
®for DualVee -basic wheel plate and track plate assemblies
A
D
A
B
Figure 1 Inboard Mounting
A
C
Figure 2 Outboard Mounting
Figure 3 Exterior Mounting
0.874 22.2 0.934 23.7
1.374 34.9 1.436 36.5
2.000 50.8 2.124 53.9
2.624 66.6 2.750 69.9
3.124 79.3 3.500 88.94XL
X
inch mm
Y
inch mm
Applications
TEA's clean room compatible guide wheels are manufactured
from 440C stainless steel bearing elements, and contain
stainless steel retainers and shields. They are internally
lubricated with synthetic, corrosion resistant, clean room
compatible grease.
For clean room operation, it is often desirable to plate the
track with thin dense chrome (armoloy), black oxide, or
electroless nickel. Stainless steel track can also be specially
cleaned prior to heat treat and then passivated. Contact T.E.A.
applications engineering for assistance with your clean room
linear guidance questions. Higher level assemblies, custom
engineered to accommodate specific clean room requirements,
can be furnished by T.E.A. Contact T.E.A. for particle emissions
data.
Clean Room Products
All T.E.A. high temperature guide wheel products are
manufactured from specially processed, thermally
stabilised, 440C stainless steel. Lubricated with a specially
formulated synthetic grease, these guide wheels are
capable of operating in temperatures up to 500°F. Special
consideration should be given to guide wheel based
designs when operating above temperatures of 300°F.
Designers must make sure that a suitable lubricant is used
on the wheel track interface, and if lubrication is
prohibitive, the appropriate derating of the bearing
should be factored in.
High Temperature Products
319
Operation Considerations
®Lubrication is the key to maximizing the life of a DualVee ®linear guide. Internally, DualVee guide wheels are
lubricated for life with an extreme pressure, corrosion
resistant grease. However, lubrication of the wheel/track
interface is the responsibility of the user. A light machine
oil or an extreme pressure grease will serve well in
minimising wear, stick slip and corrosion on the guide ®ways in a DualVee based design.
Lubrication will maximise the load capacity of an
individual bearing element. As such, for any specific
application loading condition, the presence of lubrication
on the guide ways will significantly increase the service life
over a non-lubricated configuration under the same
loads.
Lubrication will also increase the maximum linear velocity ®that a DualVee bearing arrangement can endure. In
applications where high speed or high acceleration rates
are present, lubrication of the wheel/track interface is
highly recommended. Lastly, lubrication will reduce the
overall coefficient of friction of the guide, which,
depending on the level of preload, can fall anywhere
from 0.008 to 0.015. The availability of lubricators and
wheel covers gives design engineers an opportunity to
design lubrication right into the DualVee mechanism with
little effort. See specifications on wheel covers and
lubricators for more detail.
Lubrication
®Using DualVee Motion Technology , achieving
straightness and flatness characteristics to within N grade
accuracy levels is fairly routine (±0.004 inch; ±0.10
mm). In fact, accuracies as low as ±0.001 inch (±0.03
mm) have been achieved using carefully prepared
mounting surfaces in relatively short stroke applications
(1-3 feet; 0.3-1 m). For designs requiring accuracy levels
of ±0.005 inch and better, mounting surfaces must be
prepared straight and flat, and appropriate doweling or
reference edge assembly techniques must be employed.
®In most DualVee applications, accuracy plays a small
role in successful implementation and in such cases, cold
finished or extruded bars provide adequate mounting ®surfaces for DualVee raceway design. Mounting surface
reference edges no longer require a chamfer, as the ®DualVee track design has been upgraded to include a
relief in the locating shoulder.
Figure 1: Running parallelism end view
Figure 2: Allowable tolerances for straightness and flatnessof travel - grade N
N
±
N
0.004 (±0.10 mm)
±0.004 (±0.10 mm)
Precut lengths of track are not suitable for butting end to
end. Please contact the factory when track lengths longer
than the maximum available single piece lengths are
required. Track that is suitable for butting is available on
request. When constructing track systems longer than 20
feet, the joints on parallel tracks should be staggered for
greater accuracy and smoothness.
®Precut lengths of DualVee track plate assembly are not
suitable for butting end to end. Where track plates longer
than the maximum length are required, please consult
T.E.A. for butt-joining recommendations.
Track Splicing Considerations
Accuracy
For single carriage measured at any point along the rail:
Variation in carriage height: ±0.004 inch (±0.10 mm)
Variation in carriage width: ±0.004 inch (±0.10 mm)
For multiple carriages measured at the same location
along the rail:
Variation in carriage height: ±0.001 inch (±0.025 mm)
Variation in carriage width: ±0.001 inch (±0.025 mm)
320
Operation Considerations cont.
For maximum loading and heavy continuous use, the "T"
series hard edge track should be used. For prototype or
light duty intermittent use, the "TS" series (unhardened, as
formed) track can be used at a lower cost.
Track Hardening
The stationary bushings determine the alignment of the
system. They should carry the major load whenever
p o s s i b l e . W h e e l s s h o u l d b e c o n f i g u r e d
such that the load is predominantly radial whenever
possible.
Normal adjustment is obtained by rotating the eccentric
bushings until all free play is removed from the carriage
assembly. When the eccentrics are adjusted and the
carriage plate is held firmly in place, one should be able
to rotate, by hand, any of the four guide wheels in the
system against its mating track. If rotation is not possible,
preload on the wheels should be reduced accordingly.
Overtightening of the eccentric adjustment could result in
premature bearing failure. Such a condition can exert a
force greater than the load rating of the wheel.
Fit-Up Adjustment
Figure 3: Linear guide configured primarily radial load
Figure 4: ® DualVee track mounted with stand-offs eliminates dirt traps
W
Since the circumference of the wheel is greater at the
major diameter than at the minor diameter, there is a
constant wiping action on the track producing a self ®cleaning effect. As such, DualVee guide wheels are
employed in a wide variety of harsh environments,
including the presence of metal chips, powders, fibres,
slurries, etc. It is important to note that such environments ®will often limit the service life of a DualVee linear guide
to some extent. Since environments vary from application ®to application, it is recommended that DualVee systems
be prototyped before employing on a large scale. For
instance, an OEM who is building a paper processing
machine may want to prototype a linear guide in
application where the guide ways are exposed to unique
combinations of chemicals and paper fibres. It's difficult to
predict exactly how the materials will behave in many
cases. For instance a fine, yet hard powder material may
accelerate wear in one case but simply be swept aside in
another, depending on parameters such as particle size,
temperature, humidity, and lubrication. Regardless, ®DualVee is clearly the choice of antifriction linear guide
technology in difficult environments, particularly when
success is mandatory and reliability is critical.
The other main factor affecting wear resistance is
lubrication. Wheel covers or lubricators should be
designed in whenever possible. Both will distribute a thin
coating of oil lubricant along the contact surface of the ®DualVee track. The wheel covers offer added protection
by preventing debris from entering the wheel/track contact
surface. Lubricated and relatively clean wheel/ track
contact surfaces will ensure maximum service life in a ®DualVee linear guide.
Contamination/Wear Resistance
For wash down applications, stand-offs can be used to
mount track to a mounting surface, eliminating dirt traps,
and allowing for washdown (see sketch below).
Wash Down Environments
321
The Load/Life Relationship
Several factors influence the service life of a DualVee®
linear guide. Through research and development
spanning over thirty years, BWC has devised a simple
method to estimate the load/life relationship for a specific ®DualVee guide mechanism under defined loading
conditions. The methodology accounts for the size of the ® DualVee bearing elements, relative spacing, and the
orientation, location, and magnitude of the load.
The curve is based upon clean and well lubricated track
conditions; so for applications where lubrication is
prohibitive, a derating factor must be applied.
It is important to note that secondary considerations such
as maximum velocity, acceleration rates, duty cycle, stroke
length, environmental conditions, the presence of shock,
vibration and extreme temperature ranges can all impact
service life to varying degrees. As such, the sizing method
outlined below should be used conservatively, and ®considered only as a guideline for the sizing of DualVee
components and assemblies. When time and budget ®permits, the prototyping of a DualVee arrangement is
recommended to confirm service life expectations.
The Load/Life Equation -Sizing and Selection
LF = LA / LAmax + LR / LRmaxWhere L F = Load Factor
LA = Resultant axial load on the guide wheelLAmax = The maximum axial working load
capacity of the guide wheelLR = Resultant radial load on the guide wheelLRmax = The maximum radial working
load capacity of the guide wheel
ApplicationConditions
Clean, low speed, low shock, low duty
Moderate contaminants, mediumduty, medium shock, low tomedium vibration, moderate speed
Heavy contamination, highacceleration, high speed, mediumto high shock, high vibration, highduty cycle
AdjustmentFactor
1.0-0.7
0.7-0.4
0.4-0.1
The load/life estimation requires a basic understanding of
the principles of statics, the ability to work with free-body
diagrams, and the capacity to resolve externally applied
forces on a carriage assembly into the radial and axial
reaction forces at each guide wheel in the design.
The life of a DualVee® guide will be limited to the life of
the most heavily loaded bearing in the design.
Step 1: Calculate the resultant radial and axial loads
reflected to each bearing element in the linear guide
design.
All standard considerations involved in statics calculations
must be accounted for, including inertial forces,
gravitational forces, external forces such as tool pressure,
bearing element spacing, magnitude and direction of the
payload. Any external forces that generate a reaction
through the wheel/track interface need to be considered.
If assistance is required in resolving specific loads into the
resultant reaction forces at the guide wheel interface,
contact our applications engineering staff for support.
Step 2: Calculate the load factor for the most
heavily loaded bearing.
• Bearings should be sized such that L <1F• The most heavily loaded bearing will have
the highest load factor
Due to varying application load, speed parameters and
environmental conditions, the appropriate adjustment
factor must be applied to the maximum axial and radial
working load capacities (L and L ) as follows:Amax Rmax
Oscillating motion resulting in less than one full revolution
of the wheel under load can cause accelerated wear on
the internal bearing elements.
Testing of such systems is recommended to verify
compatibility of the design with load/life requirements.
W0 146 28 650 123
W1 274 57 1220 252
W2 596 141 2650 625
W3 1326 382 5900 1701
W4 2181 900 9700 4001
W0X 146 28 650 123
W1X 274 57 1220 252
W2X 596 141 2650 625
W3X 1326 382 5900 1701
W4X 2181 900 9700 4001
W4XXL 3215 1473 14300 6552
W1SSX 274 57 1220 252
W2SSX 596 141 2650 625
W3SSX 1326 382 5900 1701
W4SSX 2181 900 9700 4001
W4SSXXL 3215 1473 14300 6552
W0SSCR 121 23 540 102
W1SS227 228 47 1013 209
W2SS227 494 117 2200 519
W3SS227 1101 317 4897 1412
322
DualVee Guide Wheel Load Capacities
Notes:1. Basic Dynamic Load Rating, According to AFBMA STD 9-1990. Based on industry standard bearing calculations and are for comparison purposes only. Maximum working load figures should be used for component sizing and selection.2. Basic Static Load Rating, According to AFBMA STD 9-1990. Based on industry standard bearing calculations and are for comparison purposes only. Maximum working load figures should be used for component sizing and selection.3. Working load capacities reflect clean, well lubricated wheel/track interface.4. For Operating Considerations - Lubrication; Track Splicing; Accuracy; Track Hardening; Contamination/Wear Resistance, Fit-up Adjustment and Wash-down Environments please go to our web site www.tea.net.au to download data pages.
Step 3: Apply the load factor to the load/lifeequation below:
Life = LC / (L3
)FWhere LF = Load Factor
LC = Life Constant
Life constants are provided in both inch and metric as tabulated.
DualVeeSize
1
2
3
4
61.65 x 10 41
62.19 x 10 55
63.47 x 10 87
65.19 x 10 130
66.84 x 10 171
68.58 x 10 2154XL
Life Constant
inches of travel life kilometres of travel life
0
All dimensions are subject to change without notice.
PartNumber
Radial Working Load Capacity
LRmax1, 2(lb )f
Load Capacity (lb )f Load Capacity (N)
Axial WorkingLoad Capacity
LAmax1, 2(lb )f
Radial WorkingLoad Capacity
LRmax2,3(N)
Axial WorkingLoad Capacity
LAmax2,3(N)
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