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Summary of Contents for Instron 2712 Series
- Page 1 2712 Series Pneumatic Side-Action Grips Operator’s Guide M10-16235-EN Revision E The difference is measurable ®...
- Page 2 Illinois Tool Works Inc. (ITW). Other names, logos, icons and ® marks identifying Instron products and services referenced herein are trademarks of ITW and may not be used without the prior written permission of ITW.
- Page 3 Caution is used where a hazard may lead to damage to equipment or to loss of data. Instron products, to the best of its knowledge, comply with various national and international safety standards, in as much as they apply to materials and structural testing.
- Page 4 Preliminary Pages Warnings Hazard - Press the Emergency Stop button whenever you consider that an unsafe condition exists. The Emergency Stop button removes hydraulic power or electrical drive from the testing system and brings the hazardous elements of the system to a stop as quickly as possible.
- Page 5 During system operation, keep away from the operating envelope of the robot. De-activate the robot before entering the envelope for any purpose, such as reloading the specimen magazine. Product Support: www.instron.com...
- Page 6 Preliminary Pages Warnings Hazard - Set the appropriate limits before performing loop tuning or running waveforms or tests. Operational limits are included within your testing system to suspend motion or shut off the system when upper and/or lower bounds of actuator or crosshead travel, or force or strain, are reached during testing.
- Page 7 Apply the specified torque to all load string fasteners and the correct setting to wedge washers or spiral washers. Visually inspect highly stressed components such as grips and threaded adapters prior to every fatigue test for signs of wear or fatigue damage. Product Support: www.instron.com...
- Page 8 Preliminary Pages M10-16235-EN...
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Page 9: Table Of Contents
Install or remove air valve toggle switch ........Product Support: www.instron.com... - Page 10 Preliminary Pages Manual Foot Switch ........... . Automatic Grip Control Unit .
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Page 11: Chapter 1: Introduction
Contact your Instron sales representative for assistance with selecting jaw faces that are suitable for your testing requirements. These pneumatic action grips clamp the specimen through a dual lever arm, actuated by air cylinders built into the grip body. -
Page 12: Grip Components
Chapter: Introduction pressure to accommodate materials that are often difficult to hold. This constant gripping force is maintained on the specimen, and provides follow-up action to compensate for any decay in the gripping force. The grips have an integral toggle air valve to open and close the grips. -
Page 13: Accessories
Letter Description Flow control Air switch Accessory mounting holes Accessories The following accessories are available. Refer to “Installation” for more details. • Jaw face shields • Specimen alignment device • Pneumatic foot switch • Automatic grip controller Product Support: www.instron.com... - Page 14 Chapter: Introduction M10-16235-EN...
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Page 15: Chapter 2: Specifications
Maximum Varies Varies according to jaw face, refer to Table 3 on page specimen according to thickness jaw face, refer Table 4 page Nominal 5.82 specimen thickness (mm) Product Support: www.instron.com... -
Page 16: Air Supply
To ensure long term operation of the grips the air supply must be dry and filtered. To ensure dry air you can install an in-line desiccant air dryer (not available from Instron) at the compressor. Use of a local regulator and 5 μm filter assembly near the testing system is also recommended. - Page 17 Grip Specifications Figure 2. Clamping force vs Air pressure for 250N grips Product Support: www.instron.com...
- Page 18 Chapter: Specifications Figure 3. Clamping force vs Air pressure for 1kN and 2kN grips M10-16235-EN...
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Page 19: Grip Dimensions
Piston outside 62.8 (2.5) 100 (3.9) 145 (5.7) 160 (6.3) 202 (8.0) diameter Body thickness 15.6 (0.61) 31 (1.2) 31 (1.2) 42 (1.7) 54 (2.1) Effective length 122.4 (4.8) 176 (6.9) 186 (7.3) 236 (9.3) 239 (9.4) Product Support: www.instron.com... - Page 20 Chapter: Specifications Table 2. Grip Dimensions - mm (in) (Continued) Dimension - Label on mm (in) Figure 5 2712-052 2712-041 2712-042 2712-045 2712-046 Jaw center to 7.96 (0.31) 16 (0.63) 16 (0.63) 19 (0.75) 19 (0.75) grip edge Figure 5. Grip Dimensions M10-16235-EN...
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Page 21: Compatible Jaw Faces
26 (1.0) 2702-322 Serrated 51 (2.0) 38 (1.5) 13 (0.5) 20 (0.79) 26 (1.0) 2702-323 Serrated 51 (2.0) 51 (2.0) 13 (0.5) 20 (0.79) 26 (1.0) 2702-324 Serrated 76 (3.0) 25 (1.0) 13 (0.5) 20 (0.79) 26 (1.0) Product Support: www.instron.com... - Page 22 Chapter: Specifications Table 3. Compatible Jaw Faces (1kN through 10kN) (Continued) Maximum Specimen Thickness - mm (in) Catalog Surface Width - mm Height - 2712-041 2712-042 2712-045 (in) mm (in) 2712-046 2702-325 Serrated 76 (3.0) 51 (2.0) 8 (0.31) 15 (0.6) 21 (0.83) 2702-326 Serrated...
- Page 23 10 (0.4) 10 (0.4) 5 (0.2) 2702-371 Smooth 12 (0.5) 25 (1.0) 5 (0.2) 2702-372 Smooth 25 (1.0) 25 (1.0) 5 (0.2) 2702-373 Smooth 50 (2.0) 25 (1.0) 5 (0.2) 2702-374 Smooth 100 (4.0) 25 (1.0) 5 (0.2) Product Support: www.instron.com...
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Page 24: Jaw Face Shields
Chapter: Specifications Table 4. Compatible Jaw Faces (250N) (Continued) Catalog Surface Height - mm Maximum Specimen Width - mm (in) (in) Thickness 2702-375 Brake Lining (HFC) 25 (1.0) 25 (1.0) 3.2 (0.13) 2702-376 Brake Lining (HFC) 50 (2.0) 25 (1.0) 3.2 (0.13) 2702-377 Line Contact... -
Page 25: Specimen Alignment Device
This device provides a backstop to align rigid or semi-rigid specimens. The rod can be adjusted by loosening the clamp with the thumbscrew. It can be used on either side of the face and can be used in combination with the jaw face shields. Product Support: www.instron.com... - Page 26 Chapter: Specifications M10-16235-EN...
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Page 27: Installation
The limit stops on the load frame are set to prevent the upper and lower grips from colliding with each other. • The mating surfaces of the grips, load cell and load frame base are free of dirt and debris. Product Support: www.instron.com... -
Page 28: Procedure - Installing 250N, 1Kn And 2Kn Grips
Chapter: Installation Procedure - installing 250N, 1kN and 2kN grips The 250N, 1 kN and 2 kN grips can be held in one hand. Therefore, you can use the following procedure to install both the upper and lower grip onto the load frame. 1. -
Page 29: Procedure - Installing 5Kn And 10Kn Grips
Letter Description 10kN upper grip Foam packaging - bottom Foam packaging - top 1. Make sure that the space between the crosshead and frame base is sufficient to place the upper grip and its packaging between them. Product Support: www.instron.com... -
Page 30: Installing And Removing Jaw Faces
Chapter: Installation 2. Remove the top foam packaging piece from the upper grip and place it on the frame base. 3. Lift the upper grip, retaining the bottom foam packaging piece, and place it on top of the top foam packaging piece. 4. -
Page 31: Install Jaw Faces
2. If jaw face shields are not installed, simply push the jaw face out of the grip body. 3. If jaw face shields are installed, insert a pencil or similar small probe into the hole in the shields and push the jaw face out of the grip body. Product Support: www.instron.com... -
Page 32: Install Jaw Face Shields
Chapter: Installation Install Jaw Face Shields Jaw face shields reduce the risk of pinching your fingers in the grips as they close on a specimen. The shields are designed so that you can replace jaw faces with the shields still in place. Figure 9 on page shows how to install jaw face shields.You can install the shields... -
Page 33: Install The Specimen Alignment Device
Two different lengths of backstop are provided. Use the one that fits your particular test setup and minimizes how far the backstop protrudes out of the grip. Figure 11 on page shows the device in use. Figure 10. Installing the Specimen Alignment Device Letter Description M4 x 20 thumbscrew Product Support: www.instron.com... -
Page 34: Adjust The Jaw Face Opening
Chapter: Installation Letter Description Backstop block Backstop M4 x 8 thumbscrew Figure 11. Using the Specimen Alignment Device Adjust the Jaw Face Opening The larger grips (5 kN and 10 kN capacity) have thumbscrews on the side of the arms that let you adjust the jaw face opening to accommodate specimens of different thicknesses. -
Page 35: Grip Air Inlets
• using the optional grip controller unit Grip Air Inlets All Instron pneumatic grips have a quick release type connector. Figure 12 on page illustrates the grip nozzle and hose coupling. The air inlets on the grips can swivel to let you keep the air hoses tidy and out of the way of testing. -
Page 36: Adjusting The Air Inlet Flow Valve
Chapter: Installation To connect: Grasp the coupling behind the sleeve and firmly push it inward on the nozzle. Make sure the coupling slides into the nozzle groove and makes complete engagement. To disconnect: Grasp the coupling sleeve and push it towards the nozzle until it disengages. If air pressure is flowing to the grip when you disconnect the nozzle, there will be a pressure discharge. -
Page 37: Air Valve Toggle Switch
Install or remove air valve toggle switch Depending on the system that the grips are shipped with, or if they are shipped alone, the air valve toggle switch may or may not be installed. Product Support: www.instron.com... - Page 38 Chapter: Installation If you are using a foot switch with or without an automatic grip control system, you may want to remove the toggle switch to avoid multiple points of control for the grips. The following procedures describe how to install the toggle switch and the plug that replaces it if it is not required.
- Page 39 M4 washer (1kN and 2kN grips only) Deflector plate (250N, 1kN and 2kN grips) M4 x 6 socket head cap screw 2. Ensure that the toggle switch is oriented as shown in Figure 17 on page Figure 18 on page 40. Product Support: www.instron.com...
- Page 40 Chapter: Installation Figure 17. Switch in open position, round side visible toward closed label Figure 18. Switch in closed position, cut side visible toward open label M10-16235-EN...
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Page 41: Manual Foot Switch
The other end of the hoses have quick disconnect fittings for connecting to the grips. The third air line has a female threaded fitting on both ends for connecting to the air supply. Figure 19 on page illustrates the foot switch. Product Support: www.instron.com... - Page 42 Chapter: Installation Caution Be sure to attach the hose for the upper grip to the clip on the crosshead as shown. If you do not, your test results will be affected by the weight of the hose, especially at low loads. Figure 19.
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Page 43: Automatic Grip Control Unit
An automatic grip control integrates the grips with the load frame's control system. Figure 20 on page illustrates the grip controller. There are various configurations for each type. Refer to the automatic grip control unit manual for specific installation details. Figure 20. Grip Controller Letter Description Grip controller Product Support: www.instron.com... -
Page 44: Preload The Load String
Chapter: Installation Letter Description Foot switch Preload the Load String The purpose of this procedure is to eliminate backlash and deflections within the load string which can degrade the integrity of test results, especially when testing at high loads. The procedure involves preloading the entire load string and then hand-tightening all the locknuts on all the grips and couplings. -
Page 45: Procedure To Unload The Load String
3. Loosen all the locknuts on the grips and any intermediate couplings. 4. Reduce the load to zero. 5. Remove the specimen. The load string is now unloaded and all the locknuts are loose so that you can change any component. Product Support: www.instron.com... - Page 46 Chapter: Installation M10-16235-EN...
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Page 47: Operation
Preparing for Use Before using the grips for testing, make sure that: • The grips are installed and the coupling pins are secure. • The jaw faces are the appropriate size for the test specimen. Product Support: www.instron.com... -
Page 48: Opening And Closing The Grips
Chapter: Operation • The air supply is on, and the air hoses are connected and free of kinks. • There is adequate slack in the air hoses to accommodate the crosshead travel that you anticipate during the test. • The gauge length your test requires is set between the ends of the upper and lower jaw faces. -
Page 49: Procedure For Installing A Specimen
Use any centering and alignment devices provided. Procedure for installing a specimen 1. Center the specimen in the grips. Make sure the specimen is perpendicular and contacts the entire length of the jaw faces as shown in Figure 21 on page 50. Product Support: www.instron.com... -
Page 50: Removing A Specimen
Chapter: Operation Figure 21. Specimen Installation Letter Description Jaw faces Specimen Recommended specimen insertion depth is 100%. The specimen should fully contact the entire length of the jaw faces. 2. Close the upper grip. 3. Close the lower grip. 4. Adjust the air pressure to the minimum required to hold the specimen during the test, without exceeding the grip’s maximum air pressure rating. -
Page 51: Procedure For Removing A Specimen
1. Open the upper grip. The jaw faces should retract away from the specimen. Caution Secure fragile specimens before opening the lower grip. 2. Open the lower grip. The jaw faces should retract away from the specimen. 3. Remove the specimen. Product Support: www.instron.com... - Page 52 Chapter: Operation M10-16235-EN...
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Page 53: Chapter 5: Maintenance
Lubricate the grips every 50,000 cycles, or every 6 months, whichever comes first. The recommended lubricant is Magnalube-G, a PTFE-based grease that is water resistant and stable at temperatures up to 260°C (500°F). A tube is supplied with each set of grips. Product Support: www.instron.com... - Page 54 Chapter: Maintenance Warning Disconnect the air supply before performing this procedure. 1. Using a 2mm allen wrench, remove the allen screws that secure the covers on each side of the grip, exposing the bores. 2. Using a cotton swab, smear a light coating of grease on the two main bores (refer to Figure 22 on page 54).
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Page 55: Servicing
If you are unable to solve a problem, contact Instron Service. Before you contact Instron Service, note the model and serial numbers of the test system and make sure there is a telephone at the test site. - Page 56 Lubricate the grip. Refer to “Lubrication” on page 53. Faulty grip seal. Replace the grip seal. Contact Instron’s Service department for assistance. For 5kN and 10kN grips only - Adjust the jaw faces closer to the jaw faces not adjusted correctly.
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Page 57: Jaw Faces Sticking And Jaw Holder Not Retracting
This is caused by parts of the advancing and retracting mechanism becoming detached from each other. Figure 23 on page shows the interconnecting parts of the mechanism. Product Support: www.instron.com... - Page 58 Chapter: Maintenance Figure 23. Jaw Face Advancing Mechanism Correctly Aligned Letter Description Jaw face Jaw holder Advancing foot Multiplier link Thumb screw The connection between the jaw face and the jaw holder is visible and the thumb screw is visible but the connection between the advancing foot and the jaw holder is not. It is this connection that can be broken if the advancing foot becomes misaligned with the corresponding groove in the jaw holder.
- Page 59 6. As you repeat this process, “snapping” the jaw face in and out while rotating the thumbscrew, you should be able to feel the advancing foot reconnect with the groove on the plunger. The thumb screw will then be in the correct orientation and the jaw faces will retract completely. Product Support: www.instron.com...
- Page 60 Chapter: Maintenance M10-16235-EN...
- Page 62 Product Support: www.instron.com...
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