Products and Services
Applications
Split Transfer Sleeves
Actuation
Inspection and Build-Up Fixture
Operating Principles
Machine Adaptability
Centering
Motor Driven Rotary Tables
Applications
Watterson hydraulic arbors and chucks are used where accurate centering, repeatability and positive clamping are a necessity. Operation is fast and reliable on automatic equipment as well as general purpose machinery.
Lathe Fixture
Lathe fixture holding on OD and ID for turning operation, assuring concentricity on multi-surfaced part with one set-up. Interference fit is obtained simultaneously on the OD and the ID of the part. OD is generated precisely with repeatability, part after part.
Milling Fixture
Milling fixture locates part's ID on expansion arbor and orients it against clamps for speedy, accurate set-up and holding. Repeatablility is assured.
Double Expansion Arbor
Double expansion arbor used in turning, milling, grinding and inspection. Outriggers are used for support.
Expansion Arbor
Expansion arbor with transfer sleeves makes the range of the expansion arbor virtually limitless.
Watterson hydraulic expansion arbors and chucks are designed to accurately locate and securely hold parts in place while performing a variety of operations. The expansion or contraction is obtained by hydraulic pressure which expands or contracts the steel sleeve within the elastic limits of the metal. The hydraulic pressure insures that the sleeve expands or contracts uniformly about the axial centerline of the workpiece resulting in true, absolute centering and positive clamping.
Watterson arbors and chucks provide the ultimate in accuracy and are manufactured to exacting standards and precision tolerances. All units are precision ground within .0002 T.I.R. as standard and up to .000025 T.I.R. for critical applications.
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Split Transfer Sleeves
With the use of precision split transfer sleeves, several parts with various inside or outside diameters may be held from one basic arbor or chuck. These transfer sleeves are slip fit to the arbor or chuck for ease of interchanging ability and assure the same positive centering and accuracy as the basic arbor or chuck itself.
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Actuation
There are numerous methods of actuation. The most common is manual by an actuator screw which can be located at the most convenient place to suit the application. The actuator may also be operated from an external source such as an air cylinder for automatic power actuation. Shown are just a few examples.
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Inspection and Build-Up Fixture
The combination of air-bearing rotary table, either motorized or hand operated, with expansion chucks and arbors, make the often difficult and time consuming task of properly centering and inspecting a relatively easy task. The control and repeatability is constant and reliable to within .0002".
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Operating Principles
In the diagrams the piston is advanced by clockwise rotation of the actuator screw. The hydraulic fluid is displaced in the piston chamber and moves through the ports exertingpressure under the steel sleeve. This equalized internal pressure is contained within the hydraulic seals compressing the sleeve radially about the workpiece in the case of the chuck, or expanding in the case of the arbor. The sleeve is further compressed or expanded and conforms to the shape of the workpiece providing accurate centering and maximum holding power. Counterclockwise rotation of the actuator screw releases the pressure and relaxes the sleeve for loading and unloading of the workpiece. Hydraulic arbors and chucks have a completely self-contained hydraulic system with no external openings or moving parts, thus eliminating any dirt or chip problem. They may be either manually or power actuated. In addition, tool chatter is reduced to a minimum because of the work, in effect, is held within a thin layer of fluid under the steel expansion sleeve.
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Machine Adaptability
Watterson arbors and chucks can be mounted in virtually unlimited applications from machine spindle to set ups. Our engineering staff will assist you in any of your design requirements.
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Centering
Watterson hydraulic arbors and chucks are radial and concentric with the true axial centerline, assuring positive centering regardless of the shape as shown in the illustrations. The sleeve expands or contracts to the workpiece conforming completely to its shape regardless of inaccuracies due to part tolerance or any of the other conditions shown. Parts of various sizes and shapes are also accommodated, such as splined or threaded parts.
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Motor Driven Rotary Tables
Motor driven air-bearing table is an example of the many specialized Watterson built adaptations of air-bearing rotary tables used for inspection and build up.
