New Product - Dualvee Vacuum Wheels
See the 2014 DualVee Catalog for product line updates, new product information, and installation information.
Our DualVee product line offers you vee guide wheel components and assemblies that are:
- Easy to use
- Simple to install
- Ideal for a wide array of applications
- Ideal in long length applications
- Tolerant of harsh environments
DualVee provides users with many vee guide wheel options:
- Original vee bearing guide wheels
(High temp and low temperature versions)
- Swaged vee bearing guide wheels
- Patented washdown wheels
- Polymer overmolded bearing guide wheels
Linear guide wheels run on either single-edge track or double-edge track. Wheels are mounted using journals or bushings.
Functionality and life of your DualVee system can be increased by incorporating wheel covers, lubricators, track plate assemblies, and wheel plate assemblies.
|Linear Guide Wheel Overview||Debris is No Match for DualVee Guide Wheels|
Download DualVee Literature:
|Complete Line DualVee Catalog|
|Washdown Wheels Flier|
|DualVee Wheel Quick Comparison|
|Mounting DualVee Track|
Original Linear Guide Wheels
DualVee linear guide wheels consist of both an external and internal 90 degree vee angle. The vee groove guide wheel is made with a double row angular contact bearing for excellent load capability and long life. Vee bearing guide wheels are available in 52100 steel or 440C stainless steel from stock. Other options include seals and shields to meet specific application needs. Special DualVee guide wheels are available for cleanroom, debris-laden, low temperature and high temperature applications. Customer specific lubricants can also be used upon request.
Talk to an applications engineer today to learn more about our swaged wheel options.
Service Temperature Comparison:
High temperature wheels: -22 to +500°F (-30 to +260°C)
Low temperature wheels: -94 to +230°F (-70 to +110°C)
Original DualVee wheels, seal (suffix X): -31 to +248°F (-35 to +120°C)
Original DualVee wheels. shield (no suffix): -22 to +212°F (-30 to +100°C)
Washdown wheels' patented design features all stainless steel construction, FDA approved grease, AISI type 440C stainless steel balls and races, and are both sealed and shielded for added protection from liquids and debris. This unique design extends life in aggressive environments - at least 3x.
How It Works: The overmolded metallic shield acts as a momentary seal when subjected to a stream of high velocity washdown fluid. The fluid velocity causes the rubberized shield to deflect and conform to the metallic surface of the wheel, sealing against the ingress of liquids. The inner seal provides the principal line of defense, ensuring that external fluids are kept out of the wheel while retaining the internal lubrication grease; both important factors affecting the life of the wheel. Once the stream is directed away from the wheel, the deflected shield returns to its original position, allowing any residual fluid that entered the zone between the shield and seal to drain out or be spun out by centrifugal force.
| Washdown Environment Demonstration
|| Washdown Environment Animation
Single Edge Track
Single edge track is available in AISI 1045 carbon steel and 420 stainless steel from stock. At the Vee edge, a mounting shoulder is provided for quick reference during assembly. Track is offered with or without hardened Vee surfaces. Hardened track comes in lengths of 20 feet, and can be easily butt-jointed for longer length applications. Non-hardened track comes in lengths up to 22 feet, and also may be butt-jointed for longer lengths. Additionally, all single edge tracks may be purchased with or without drilled holes for mounting.
Double edge track is made from AISA 1045 carbon steel, with two hardened or non-hardened Vee edges. One Vee edge also has a mounting shoulder like the single edge track. Hardened track comes in lengths of 20 feet, and can be easily butt-jointed for longer length applications. Non-hardened track comes in lengths up to 22 feet, and also may be butt-jointed for longer lengths. All double edge track may be purchased with or without drilled holes for mounting.
Track Plate Assemblies
Track plate assemblies combine your choice of single edge DualVee track with an easy to mount aluminum base. The aluminum base is made from high precision aluminum alloy with an anodized coating. Track plate assemblies are easily butt-jointed to provide infinite lengths.
There are two choices for wheel plate assemblies, wiper wheel plates and basic wheel plates. Wiper wheel plates are available with your choice of DualVee v bearing guide wheels and provide the lowest height solution. Basic wheel plates are the more economical choice and are supplied with your choice of DualVee v bearing integral wheels, and either lubricators or wheel covers. Both the wiper wheel plate and the basic wheel plate are intended to run on track plate assemblies.
Journals and bushings provide time proven methods to affix DualVee v bearing guide wheels. Eccentric and concentric versions of journals and bushings provide optimum adjustment for each individual application. Bushings are available in standard height or low profile versions, as well as metric and inch versions.
Wheel covers provide lubrication to the Vee interface between the track and the v bearing guide wheel to help keep your DualVee system running at its best. The guide wheel is protected from direct contact with particulate or spray. Wheel covers come in a variety of sizes and heights to accommodate various bushings and integral guide wheels.
Lubricators, like wheel covers, provide lubrication to the Vee interface between the track and the v bearing guide wheel to help keep your DualVee system running at its best. Lubricators come in a variety of sizes and heights to accommodate various bushings, journals, and integral guide wheels.
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New Product - Dualvee® Vacuum Wheels
Designed Specifically for Use in Vacuum Environments
DualVee® Vacuum Wheels are linear guide bearings with precision ground 90-degree surfaces for linear and rotary motion applications in vacuum environments and testing chambers. Made of vacuum compatible AISI440C and 304 stainless steel and grease, these guide wheels are capable of ultra high vacuum down to 10-9 mbar. Mount on AISI303 DualVee® bushings and run on 90-degree AISI 420 track in single piece lengths up to 20 feet and available in two sizes with load capacities up to 1855N radially, and 440N axially, they are ideal for guided motion in challenging environments.
High Technology Applications
- Research & Developement
- Materials Science
- Chemial Vapor & Plasma Deposition
- Semiconductor & Electronics Fabrication
- High Attitude Testing and Simulation
- Space Testing and Simulation
- Life Science and Pharmaceutical
- Filling, Encapsulating, Dosing
- Package Sealing & Leak Testing
Design your next motion application with dualVee Vacuum Wheels, wheel mounting, bushings and guide track.
Are DualVee wheels available with a special grease?
Yes, we can fill the wheels with customer-specified or customer-supplied lubricants.
Can DualVee wheels be used with Hepco track?
In most cases, no. Almost all Hepco track uses a 70° vee, while DualVee wheels are a 90° vee. We do not recommend using 90 degree wheels on 70 degree track nor vice versa, because the contact surface between the wheel and track is very small. The smaller contact surface will accelerate wear and decrease system life.
Will DualVee wheels run on surfaces other than DualVee track?
DualVee wheels can run on any 90° surface, such as a piece of angle iron. However, note that wear characteristics will be different, and life might be compromised.
Can larger wheels run on smaller track?
In some cases, yes.There are instances where the larger wheels will not work. Consult the factory for details. Can smaller wheels run on larger track? Yes. The larger track may be used to provide more support for the machine.
Is double edge track available in other than size 0?
DualVee double edge track is available only is size 0. Hepco's GV3 line offers various double edge track sizes.
Does DualVee track need to be lubricated?
It is not necessary to lubricate the track in certain cases (light loads, low duty cycle), but a significant improvement in track life will result from lubricating the track with oil.
Where can I find information on mounting DualVee track?
Click here for mounting instructions. What is the maximum recommended speed for DualVee guide wheel technology? Speeds up to 5.5 meters per second.
Can guide wheels be used in high temperature applications?
Specially designed guide wheels using all stainless steel components, heat stabilized material, with special grease, can operate up to 500oF.
What is the temperature range of the standard carbon wheels?
The temperature range of standard carbon steel wheels is limited by the service temperature range of the elastomeric seal and grease. For standard grease, the service temperature range would be from -35oC to +100oC.
Is the grease used in polymer wheels the same as carbon wheels?
Yes. The same standard grease is used for both polymer and carbon wheels.
How much quieter are polymer wheels than carbon wheels?
Unknown. No quantitative data is available at this time.
Should the mounting threads for the eccentric wheels be secured with Loctite?
Yes. Use red Loctite if there is no future need to adjust the preload, and blue Loctite if future adjustments may be needed. However, when applying Loctite compounds, be sure to adjust and set the wheels within a short time after applying the compound.
Where can I obtain specifications for tightening the eccentrics?
Click here for instructions for tightening eccentrics. Note that the process is based on feel, rather than any quantitative tightening load.
What is the coefficient of friction for guide wheel technology?
Between 0.005 — 0.02, when operated on DualVee track.
What are the differences between the Studded Guide Wheels Assembly (SWA) and the Studded Integral (SWI) wheel?
The SWA wheel is an assembly where the stud is swaged onto the wheel. SWI wheels sizes 0 and 1 are swaged assemblies, sizes 2+ are fully integrated assemblies (stud is integrated with the inner race). The stud geometry and materials are also different between the SWA and SWI studded wheels. SWI concentric and eccentric studs feature different geometry to eliminate the wheels from being misassembled in the wrong location. SWI wheels are available up to size 4. SWA wheels are available up to size 2. DualVee wheels have a 90° vee while Hepco GV3 wheels have a 70° vee.
Are there benefits to the different vee designs?
Theoretical benefit #1: When the wheels are loaded, the highest stress occurs at the apex of the inner vee. The 90° vee in DualVee wheels creates a lower stress concentration at the apex than the 70° vee (assuming identical apex relief radius) and also results in less of a resultant "outward wedging force" on the wheel.
Why is the stainless steel track magnetic, and why does it rust?
DualVee track is made from type 420 martensitic stainless steel. This alloy can be heat treated to produce a hardened track surface, which provides good wear resistance in service. Martensitic alloys are magnetic in all heat treatment conditions, which relates to the ratio of iron/chromium contents within the chemical compositions of the alloys.It has been observed that stainless steel track can rust in service. However, all grades of stainless steels can rust in certain environments, but some are more corrosion resistant than others. For example, austenitic stainless steels (300 series) are accepted as having the best corrosion resistance of all stainless steel alloys. The lower corrosion resistance of type 420 can be attributed to a lower chromium content than 300 series stainless steels. It is important to note that while 300 series stainless steels are the most corrosion resistant alloys, they are not hardenable by heat treatment. This inability to harden means that 300 series stainless steels are not as suitable for track applications and will not perform as well as 420 series in abrasive wear environments.
What do the terms 'axial load' and 'radial load' refer to with regard to a bearing?
Axial load is any load that is parallel to the axis of rotation of the bearing. Radial load is any load that is perpendicular to the axis of rotation.
What does the term 'Double Row Angular Contact' refer to with regards to bearings?
"Double row angular contact" refer to the two rows of ball bearlings loaded at a particular angle. These bearings offer high load carrying capacity in both axial and radial directions. These high load capabilities result in long service life.
Why does the DualVee wheel have an inherent self-cleaning property as it rolls along its mating track?
DualVee Motion Technology is designed for dirt and extreme environments. The patented 90º DualVee guide wheel design creates a velocity gradient because the circumference of the wheel is greater at the major diameter than the minor diameter. This velocity gradient causes a constant sweeping action, thus cleaning debris from the track.
How do I calculate forces and life for DualVee guide wheels?
Step 1: Calculate loads on each bearing Given below are force equations for some common four-wheel carriage assembly configurations, in which two wheels absorb the load at both points 1 and 2, divide the calculated load by 2 to obtain the load on each wheel.
*Note: Since carriages use four wheels, two wheels absorb the load at both points 1 and 2. Divide the calculated load by 2 to obtain the load on each wheel.
*Note: Since carriages use four wheels, two wheels absorb the load at both points 1 and 2. Divide the calculated load by 2 to obtain the load on each wheel. Example: Scenario 3 L = 200 lbs X = 15 inches Y = 5 inches
Step 2: Calculate the load factor for the most heavily loaded bearing Using the above example with size W4X guide wheel, FA(max) and FR(max) from the DualVee load rating chart.
Step 3: Calculate life estimate For life constants, AF assumed at 1