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Copyright information Trademark information © 2012 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 Carleton-Stuart Corporation. Surfalloy is a trademark of Alloying Surfaces Incorporated. Scotch-Brite is a trademark of 3M. All other trademarks or service marks are property of their respective owners.
Contents Technical Support 5 How to Get Technical Support Before You Contact MTS 5 6 If You Contact MTS by Phone 7 Problem Submittal Form in MTS Manuals 8 Preface 11 Before You Begin Conventions 11 12 Documentation Conventions 12 Introduction 15 Functional Description Specifications 17 20 Safety Information 21 General Safety Practices: Grips and Fixtures Hazard Placard Placement 27 Power Loss Consideration 27 21 Installation 29 Installation Using the Mounting Pin 30 Installation Without
Operation 39 Selecting Face Surfaces 40 Grip Faces for the 10 N Grips 41 Grip Faces for the 200 N and 2000 N Grips Grip Faces for the 10,000 N Grips Changing Face Surfaces Changing Wedges 42 45 47 48 Installing a Specimen 50 Adjusting the Air Supply Pressure 53 Maintenance 55 4 Contents Advantage™ Pneumatic Grips
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 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. Technical support methods www.mts.
Before You Contact MTS MTS can help you more efficiently if you have the following information available when you contact us for support. Know your site number and system number The site number contains your company number and identifies your equipment type (such as material testing or simulation). The number is typically written on a label on your equipment before the system leaves MTS. If you do not know your MTS site number, contact your sales engineer.
Know relevant computer information Know relevant software information For a computer problem, have the following information available: • Manufacturer’s name and model number • Operating software type and service patch information • Amount of system memory • Amount of free space on the hard drive where the application resides • Current status of hard-drive fragmentation • Connection status to a corporate network For software application problems, have the following information available: • Th
Identify system type Be prepared to troubleshoot Write down relevant information After you call To enable the Call Center agent to connect you with the most qualified technical support specialist available, identify your system as one of the following types: • Electromechanical material test system • Hydromechanical material test system • Vehicle test system • Vehicle component test system • Aero test system Prepare to perform troubleshooting while on the phone: • Call from a telephone close
Access the Problem Submittal Form: Advantage™ Pneumatic Grips • In the back of many MTS manuals (postage paid form to be mailed to MTS) • www.mts.
Technical Support Advantage™ Pneumatic Grips
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.
Conventions Illustrations Electronic manual conventions Hypertext links Advantage™ Pneumatic Grips Illustrations appear in this manual to clarify text. They are examples only and do not necessarily represent your actual system configuration, test application, or software. This manual is available as an electronic document in the Portable Document File (PDF) format. It can be viewed on any computer that has Adobe Acrobat Reader installed.
Conventions 14 Preface Advantage™ Pneumatic Grips
Introduction The Advantage™ Pneumatic Grips hold a test specimen in a load unit for static tension testing. Most of the grips accommodate flat-surfaced specimens only, the 10,000 N high tensile grip can clamp flat and round specimens.
What you need to know 16 Introduction This manual assumes that you know how to use your controller. See the appropriate manual for information about performing any controller-related step in this manual’s procedures.
Functional Description Functional Description The Advantage Pneumatic Grips are designed for static tension testing. The pneumatic grips require an external air supply to provide filtered, dry air to the grips. Applying air to the grips cause them to clamp and removing the air causes them to release. There are a variety of ways to control the air to the grips. The grips can be installed in an electromechanical load frame or a servohydraulic load unit with the appropriate adapter kit.
Functional Description Advantage 10,000 N applications The 10,000 N (2,200 lbf) capacity pneumatic grips are designed for performing tensile tests on a variety of materials including elastomers, plastics, rigid and semi-rigid films, and sheets. These grips can use a variety of flat, round, and veeshaped wedges. They feature dual acting grip faces that simultaneously move to the centerline of the grip. The grips offer quick and easy specimen insertion.
Functional Description Adapters Each grip assembly includes a set of standard mounting pins. Some grip assemblies include different size mounting pins for the upper and lower grips. Optional adapters are available to install the grips in some specific load frames or load units. Optional mounting adapters allow the grips to be installed on an actuator and load transducer of a servohydraulic load unit. The adapter allows the use of the standard mounting pin in servohydraulic systems.
Specifications Specifications This section lists the specifications for the Advantage Pneumatic Grips. General Specifications PARAMETER SPECIFICATION Temperature range -40°C to 200°C (-40°F to 400°F)* Air supply must provide clean dry air at 5.5 bar (80 psi) * Between -40°C and 0°C moisture will accumulate on exposed parts and freeze. Moisture compromises the functionality of the grips at this temperature range. Use an external clamp/release switch for this temperature range.
Safety Information General Safety Practices: Grips and Fixtures Typically, grips and fixtures are part of equipment used in MTS testing systems. This section provides general information about safety issues that pertain to systems that use grips and fixtures.
You should receive training on this system or a similar system to ensure a thorough knowledge of your equipment and the safety issues that are associated with its use. In addition, you should gain an understanding of system functions by studying the other manuals supplied with your test system. Contact MTS for information about the content and dates of training classes that are offered.
Avoid pinch/crush points Pinch points exist between the parts of the grip or fixture that contact the specimen. Be aware of these pinch points when installing a specimen or working around the grip or fixture during test setup. High forces generated when grip pressure is activated can pinch, cut, or crush anything in the path of the grip/ fixture specimen contact area and cause serious injury. Stay clear of any potential pinch points. A crush point exists between the grips.
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. In addition, ensure that local emergency contact information is posted clearly and in sight of the system operator. Be aware of component movement with hydraulics off The actuator rod can also drift down when hydraulics are turned off hitting anything in its path.
Do not disable safety devices Your system may have active or passive safety devices installed to prevent system operation if the device indicates an unsafe condition. Do not disable such devices as it may result in unexpected system motion. Provide adequate lighting Ensure adequate lighting to minimize the chance of operation errors, equipment damage, and personal injury. You need to see what you are doing.
Do not disturb sensors Do not bump, wiggle, adjust, disconnect, or otherwise disturb a sensor (such as an accelerometer or extensometer) or its connecting cable when hydraulic pressure is applied. Ensure secure cables Do not change any cable connections when electrical power or hydraulic pressure is applied. If you attempt to change a cable connection while the system is in operation, an open control loop condition can result.
Hazard Placard Placement Hazard placards contain specific safety information and are affixed directly to the system so they are plainly visible. Each placard describes a system-related hazard. When possible, international symbols (icons) are used to graphically indicate the type of hazard and the placard label indicates its severity.
Safety Information Advantage™ Pneumatic Grips
Installation This section describes how to install the Advantage Pneumatic Grips into a load frame of an electromechanical test system or a load unit of a servohydraulic test system.
Installation Using the Mounting Pin Installation Using the Mounting Pin This section describes how to install of the Advantage Pneumatic Grips using the standard mounting pin.
Installation Using the Mounting Pin 1. Set up the load frame. A. Turn on the power to the load frame. B. Adjust the crosshead position as necessary to allow adequate room to install the grips. C. Turn the load frame power off. D. Clean all of the surfaces that will contact each other (such as the mounting pin and the load frame mounting adapter) and lubricate them with Magnalube®-G. 2. Mount the grip assemblies to the load frame. A. Install the mounting pin into the load frame mounting adapter.
Installation Without Using the Mounting Pin Installation Without Using the Mounting Pin This section describes how to install the Advantage Pneumatic Grips by bolting them directly to a load unit actuator and force transducer (usually in a servohydraulic test system). Note You will need the appropriate attachment kit to install the grips in a servohydraulic load unit.
Installation Without Using the Mounting Pin 1. Set up the load unit. A. Turn on the system hydraulic pressure. B. Adjust the actuator and crosshead positions as necessary to allow adequate room to install the grips. Lock the crosshead if you reposition it. C. Turn the hydraulic pressure off. WARNING Installing the grip puts your hands in a crush zone. Your fingers and hands could get crushed. Make sure you have locked the crosshead, and that you have removed hydraulic pressure from the load unit. D.
Installation Without Using the Mounting Pin 3. Mount the grips to the load unit. Mount one grip to the actuator and the other to the force transducer. 10 N only 200 N/2000 N only 10,000 N only An installation kit (MTS part number 100-044-042) is required for the 10 N grip. Replace the cap screw with the longer one from the installation kit. Replace the O-ring from the end cap with the washer from the kit. Insert the cap screw through the end cap and secure it with one jam nut.
Connecting the Air Supply Connecting the Air Supply An external air supply is required to operate the grips. The air supply must produce clean dry air. Different grip control options are available. Advantage™ Pneumatic Grips • The most basic configuration consists of connecting the two grips directly to the air supply using the supplied fixtures and tubing. This requires the grips to be controlled manually using the air valve knob on each grip (the 10 N grip requires remote, in line, air switches).
Connecting the Air Supply Air connection kits KIT The following list the kits which can be used individually or in combinations of each other: MTS P ART NUMBER DESCRIPTION Standard Fittings (included with all grips) 100-041-200 The grips include mating connectors to the grips air fixtures, a “Y” fitting, and 3 m of tubing. These components can be used to connect both grips to a common air source.
Connecting the Air Supply 2 1 To Air Supply Remote Switches MTS P/N 100-041-201 2 1 Standard Fittings MTS P/N 100-041-200 Filter/Regulator Assembly MTS P/N 100-041-199 Alternate P/N 26.
Connecting the Air Supply 38 Installation Advantage™ Pneumatic Grips
Operation Grip operation consists of selecting and changing face surfaces (or wedges), and installing a specimen. Contents Selecting Face Surfaces 40 Changing Face Surfaces 47 Changing Wedges 48 Installing a Specimen 50 Adjusting the Air Supply Pressure Clamping and releasing the grips 53 Clamping and releasing the grips can be accomplished several ways: • Manually – each grip has a knob (except the 10 N model) that controls an air valve.
Selecting Face Surfaces Selecting Face Surfaces A face is a type of surface attachment for the Advantage Pneumatic grips. There are a variety of surface coatings to accommodate a variety of specimens. The following tables will help you determine which face is suitable for a specific type of specimen. Note You are responsible for matching the appropriate face with the type of specimen you intend to test.
Selecting Face Surfaces Grip Faces for the 10 N Grips These grip faces are for the 10 N (2 lbf) Advantage Pneumatic Grips and specimens from 0 to 5 mm thick. Table 1: 15 mm x 8 mm (0.6 in x 0.3 in) Face Surface Part Number Obsolete P/N* Smooth 056-163-701 Serrated 056-163-702 38.00662 Rubber† 056-163-703 38.00401 * Obsolete part numbers are associated with older grips. Current part numbers are direct replacements.
Selecting Face Surfaces Grip Faces for the 200 N and 2000 N Grips The faces for the 200 N (40 lbf) and the 2000 N (450 lbf) Advantage Pneumatic Grips are compatible and the same as the ones used on MTS Screw Grips. The 25 x 25 mm (1.0 x 1.0 in) size is preferred for the 200 N grip; the 38 x 58 mm (1.5 x 2.28 in) size is preferred for the 2000 N grip. Table 2: 12.5 mm x 25 mm (0.
Selecting Face Surfaces Table 4: 25 mm x 75 mm (1 in x 2.6 in) Face Surface Part Number Obsolete P/N* Smooth 056-163-809 Corrugated 056-163-810 38.00695 Serrated 056-163-811 38.00696 056-163-812 38.00581 Rubber (matte) 056-163-813 38.00698 Rubber (corrugated)† 056-163-814 38.00697 Rubber (smooth)† 056-163-815 38.00425 Diamond Tip † * Obsolete part numbers are associated with older grips. Current part numbers are direct replacements.
Selecting Face Surfaces Table 6: 38 mm x 58 mm (1.5 in x 2.3 in) Face Surface Part Number Obsolete P/N* Smooth 056-163-816 Corrugated 056-163-817 38.00406 Serrated 056-163-818 38.00407 Diamond Tip 056-163-819 38.00408 056-163-820 38.00700 Rubber (corrugated)† 056-163-821 38.00699 Rubber (smooth-EPDM)† 056-163-822 38.00409 Line Contact (r=4.75mm) 056-163-823 38.00410 Line Contact (r=4.75mm) w/ Rubber Opposite† 056-163-827 38.00701 Grab Test 056-163-824 38.
Selecting Face Surfaces Grip Faces for the 10,000 N Grips These grip faces are wedges for the high tensile grips rated at 10,000 N (2000 lbf). The usable width of these wedges is 25 mm (1 in) or 50 mm (2 in), the insertion depth is 38 mm (1.5 in), and the temperature range is -40°C to 177°C (40°F to 350°F). They are sold in matched sets of four. Flat 25 mm (1 in) wedges Flat 50 mm (2 in) wedges Advantage™ Pneumatic Grips Surface Specimen Thickness Part Number 90° Diamond 0–7.1 mm (0–0.
Selecting Face Surfaces Round wedges Vee-shaped wedges Operation Specimen Diameter Part Number Surfalloy 10 mm 50507912 Surfalloy 15 mm 50507913 Surfalloy 25 mm 50507914 Surfalloy 0.5 in 50507915 Surfalloy 1 in 50507916 The vee wedge specimen diameter specification represents the diameter range if the specimen is installed from the side of the grips (the widest opening).
Changing Face Surfaces Changing Face Surfaces Grip faces for the 10 N, 200 N, and 2000 N grips are held in the grip assemblies with grip face pins. These pins have a tiny O-ring on one end of it to prevent the grip face pin from working its way out of the grip assembly. Grip Coupling O-ring Grip Face Pin Serrated grip faces must be orientated as shown. Each grip face has an arrow that indicates the direction the face should be pulled. When the faces are installed the arrows point towards the grip.
Changing Wedges Changing Wedges Several types of wedges are available for the grips: • Narrow flat wedges are used for flat specimens • Round wedges are used for round specimens • Vee-notched wedges are used for round specimens • Optional wide wedges are available for flat, full width specimens The following figure shows the components involved with changing the wedges.
Changing Wedges Procedure Perform the following procedure to replace one wedge with a different wedge. Note Each wedge is labeled with the wedge part number and manufacturing date code. Ensure that replacement wedges are a matched set before attempting to install the wedges into the grip. 1. Remove any specimen installed in the grips. Leave the grip controls in the release position. • Position the load frame as necessary for convenient access to the grip wedges. • Remove the grip air supply pressure.
Installing a Specimen Installing a Specimen The following procedure describes how to install a specimen in the Advantage Pneumatic Grips. This procedure assumes the proper set of face surfaces has been selected and properly installed. CAUTION The contact area between the grip face and specimen should be as large as possible. A small contact area between the grip face and specimen can cause premature wear to the grip face surface.
Installing a Specimen CAUTION Improper specimen installation can damage the grip faces. To prevent damage to the grips, install the grip faces precisely as specified in the following steps. 1. Adjust the grip pressure to the maximum level as determined in “Adjusting the Air Supply Pressure” on page 53. 2. Apply power to the load frame or load unit. 3. Release the upper and lower grips.
Installing a Specimen 6. If specimen slippage occurs which exceeds the specifications in Step 4 and Step 5, reinstall the specimen and increase the grip pressure. Note the caution above.
Adjusting the Air Supply Pressure Adjusting the Air Supply Pressure The output pressure of the air supply determines the gripping force applied to the specimen by the grip faces. The optimum gripping force is great enough to securely grip the specimen, yet low enough to minimize specimen deformation or prevent specimen slippage. CAUTION The grips can be damaged if operated with incorrect air pressure. Insufficient air pressure can cause the wedges to separate from the piston.
Adjusting the Air Supply Pressure Where: A = Area of the piston is 215 cm2 (33.
Maintenance This section provides information on Advantage Pneumatic Grip maintenance. Also provided is a table listing spare parts kits.
Cleaning face surfaces Periodically check the face surfaces for debris buildup. Clean them if necessary. Face surfaces will wear out eventually and need to be replaced. Use only MTS replacement parts. See “Selecting Face Surfaces” on page 40 for replacement parts. CAUTION Do not use oil or alcohol based solvents or abrasive material to clean rubber face surfaces. Using oil or alcohol based solvents or abrasive material such as Scotch-Brite™ on rubber face surfaces can cause product damage.
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.
