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Copyright information Trademark information © 2011 MTS Systems Corporation. All rights reserved. MTS is a registered trademark of MTS Systems Corporation within the United States. These trademarks may be protected in other countries. Molykote is a registered trademark of Dow Chemical Corporation. Superbolt is a registered trademark of Steinbock Machinery Corporation. Torquenut is a trademark of Steinbock Machinery Corporation.
Contents Technical Support 5 How to Get Technical Support Before You Contact MTS 5 5 If You Contact MTS by Phone 6 Problem Submittal Form in MTS Manuals 7 Preface 9 Before You Begin Conventions 9 10 Documentation Conventions 10 Introduction 13 Series 249 Rod Swivel Functional Description 14 Series 249 Rod Swivel Component Identification Series 249 Rod Swivel Specifications 15 16 Safety Information 17 General Safety Practices 17 Safety Practices Specific to Swivels 18 Installation 21 Mou
Series 249G2 Swivels
How to Get Technical Support Technical Support How to Get Technical Support Start with your manuals The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes MTS software, look for online help and README files that contain additional product information. If you cannot find answers to your technical questions from these sources, you can use the internet, e-mail, telephone, or fax to contact MTS for assistance.
If You Contact MTS by Phone Know information from prior technical assistance Identify the problem Know relevant computer information Know relevant software information If you have contacted MTS about this problem before, we can recall your file.
Problem Submittal Form in MTS Manuals If you are calling about an issue that has already been assigned a notification number, please provide that number. You will be assigned a unique notification number about any new issue.
Problem Submittal Form in MTS Manuals 8 Technical Support Series 249G2 Swivels
Before You Begin Preface Before You Begin Safety first! Other MTS manuals Before you use your MTS product or system, read and understand the Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance can result in hazardous conditions that can cause severe personal injury or death, or damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue.
Conventions Conventions Documentation Conventions The following paragraphs describe some of the conventions that are used in your MTS manuals. Hazard conventions Hazard notices may be embedded in this manual. These notices contain safety information that is specific to the activity to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow all directions and recommendations.
Documentation Conventions Hypertext links Series 249G2 Swivels The electronic document has many hypertext links displayed in a blue font. All blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.
Documentation Conventions 12 Preface Series 249G2 Swivels
Introduction The MTS Series 249 Swivels allow linear actuators to pivot freely at the base and rod ends.. Two types of swivels are available, base and rod, which allow the use of swivels at each end of an actuator. Each type of swivel is available in Adjustable and Non-Adjustable variants. Adjustable swivels have components that minimize bearing backlash in through zero loading conditions in tensioncompression testing. The following figure shows the four types of swivels.
Series 249 Rod Swivel Functional Description Series 249 Rod Swivel Functional Description The Series 249 Swivels are used for testing purposes where swivel movement with minimum backlash is required. They are particularly suited for the demands of closed-loop servohydraulic testing applications. The swivels can be mounted to a linear hydraulic actuator, load cell, or mechanical linkage. A reaction mass, bedplate, or structural component can be attached to a mounted swivel.
Series 249 Rod Swivel Component Identification Series 249 Rod Swivel Component Identification Series 249 Swivel Components Callout Component Description 1 Anti-Rotate Tabs These tabs on the swivel eye restrict the twisting motion of the swivel assembly. 2 Swivel eye The base swivel eye can be mounted to the base of the actuator, while the rod swivel eye is designed for mounting to a load cell or the piston rod of an actuator. The swivel eye contains the spherical bearing.
Series 249 Rod Swivel Specifications Series 249 Swivel Components (Continued) Callout Component Description 8 Spherical washers (adjustable swivels only) On Series 249 swivels, spherical washers compensate for non-parallel surfaces within the load path of the swivel eye. Different backlash adjustment settings may cause the surfaces of the split in the swivel eye to be non-parallel. The washers ensure this does not compromise backlash adjustment or damage the clamping bolt.
General Safety Practices Safety Information This section provides general information about safety issues that pertain to swivels. Typically, swivels are part of equipment used in MTS structural testing systems. You are expected to be familiar with safety information that relates to the high-pressure and high-performance characteristics of MTS servohydraulic systems.
Safety Practices Specific to Swivels Each test system operates within a unique environment which includes the following known variables: • Facility variables (facility variables include the structure, atmosphere, and utilities) • Unauthorized customer modifications to the equipment • Operator experience and specialization • Test specimens Because of these variables (and the possibility of others), your system can operate under unforeseen circumstances that can result in an operating environment wit
Safety Practices Specific to Swivels Know facility safe procedures Most facilities have internal procedures and rules regarding safe practices within the facility. Be aware of these safe practices and incorporate them into your daily operation of the system. Have first aid available Accidents can happen even when you are careful. Arrange your operator schedules so that a properly trained person is always close by to render first aid.
Safety Practices Specific to Swivels Wear appropriate personal protection Wear eye protection when you work with high-pressure hydraulic fluid, breakable specimens, or when anything characteristic to the specimen could break apart. Wear ear protection when you work near electric motors, pumps, or other devices that generate high noise levels. Some systems can create sound pressure levels that exceed 70 dbA during operation.
Mounting a Swivel Installation This section describes how to install the Series 249 Swivels to the foundation. For information is attaching the swivels to actuator rods, refer to the appropriate actuator product manual. Contents Mounting a Swivel 21 Mounting for Angularly Applied Loads Rigid support for swivel mounts 22 The swivel base assembly is not designed to rigidly support an actuator for vertical operation.
Mounting for Angularly Applied Loads Before mounting the swivel, apply Molykote® G grease, or equivalent, to the threads and under the head of each mounting bolt. Tighten each bolt until it is firmly seated against the swivel. Then, using the pattern shown in the following figure, tighten the bolts to one-half of the recommended torque value. Continue using this pattern to tighten the bolts to their final torque value.
Mounting for Angularly Applied Loads .M 50 24 0 9.x x .M 10 00 24 9.x x .M 34 0 24 9.x x 5000 22.241 .M 16 0 24 9.x x 3000 13.344 24 9.x x 24 9.x x .M 70 .M 25 Different system configurations require the use of different types of retaining stops. In all cases, the retaining stops must withstand a shear force equal to or greater than the forces specified in the following illustrations. 90 β (degrees of rotation from the vertical ) 80 70 60 50 40 30 20 10 0 2000 8.896 lbf kN 7000 31.
Mounting for Angularly Applied Loads 24 Installation Series 249G2 Swivels
Swivel Bearing Backlash Maintenance Contents Swivel Bearing Backlash 25 Checking for Swivel Bearing Backlash—Observation Method 26 Checking for Swivel Bearing Backlash—System Response Method Adjusting Backlash 27 Considerations For Superbolt Torquenuts Overview 27 30 Maintenance for the Series 249 Swivels consist of periodic checks and, if necessary, adjusting the backlash. Series 249N are not backlash adjustable, and therefore do not require maintenance of the clamping bolt system.
Checking for Swivel Bearing Backlash—Observation Checking for Swivel Bearing Backlash—Observation Method During system operation, you should examine the swivel assembly to determine if there are any visible signs of backlash. If possible, this examination should be performed immediately after system installation, so that you can better recognize the “normal” appearance, sound, and feel of a properly adjusted swivel in case an adjustment becomes necessary in the future.
Checking for Swivel Bearing Backlash—System These methods will only detect large amounts of swivel bearing backlash. If the backlash can be seen, heard, or felt, the swivels require adjustment. Checking for Swivel Bearing Backlash—System Response Method When a swivel bearing is too loose, the amount of force measured as the actuator moves from compression to tension can exhibit a small signal discontinuity during the load reversal.
Adjusting Backlash Tightening the swivel bearing backlash adjustment beyond recommended levels can significantly increase the heat and friction produced by the swivel during operation. Increased heat and friction on the swivel assembly can cause the bearing to fail and result in damage or injury to equipment and personnel. Carefully follow the backlash adjustment procedure, and do not exceed the specified backlash adjuster clamping torque.
Adjusting Backlash Note In the following table, the torque to swivel eye when properly adjusted specification is F = L x H. L F Swivel Rotation Force Rating Tilt Angle Swivel Angle Adjuster Bolt Clamping Torque Torque to Swivel Eye when Properly Adjusted 25kN (5.5kip) 7° +90°, -90° 33.8 N·m (25 ft-lbf) 31.2 to 36.6 N·m (23 to 27 ft-lbf) 70 kN (15 kip) 17° +90°, -75° 108.4 N·m (80 ft-lbf) 67.8 to 81.3 N·m (50 to 60 ft-lbf) 160 kN (35 kip) 17° +90°, -80° 379.6 N·m (280 ft-lbf) 108.
Considerations For Superbolt Torquenuts 5. Apply hydraulic pressure and check for backlash using the methods described previously. Note The increased amount of force that will be required to rotate and tilt the swivel when it is set to an extremely tight backlash adjustment can introduce unwanted forces into the testing system. Therefore, setting the adjuster so that it just barely contacts the spherical washer when fully torqued should not be considered the optimum backlash adjustment setting.
Considerations For Superbolt Torquenuts 1. Following the sequence shown below, loosen every third jackbolt oneeighth turn at a time. Repeat this process until all of the jackbolts can be turned by hand. This will prevent a single jackbolt from bearing the entire load of the Torquenut . 2. After all the jackbolts have been loosened, loosen the Torquenut on the main thread by turning the nut by hand or with a bar inserted between the jackbolts (do not damage the threads of the jackbolts). 3.
Considerations For Superbolt Torquenuts 32 Maintenance Series 249G2 Swivels
m MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com Internet: www.mts.
