Bolt Grips and Nut Grips http://support.mts.
Copyright information Declaration Trademark information Publication information 2010 MTS Systems Corporation. All rights reserved. This manual describes all the available MTS fastener fixtures. The actual fixtures supplied to the customer depend on the specs and types of specimen and relevant standards stated in the purchase contract. Refer to Appendix A in fixture purchasing and usage. MTS is a registered trademark and MTS Fundamental is a trademark of MTS Systems Corporation within the United States.
Contents Introduction 5 Component Identification 6 Safety 11 Installation 17 Operation 21 Bolt Tests 21 Proof Load Test for Nuts 26 Tests for Other Types of Specimens 29 Appendix A 31 MTS Fundamental™ Bolt Grips and Nut Grips 3
MTS Fundamental™ Bolt Grips and Nut Grips
Introduction The MTS Fundamental fixtures are designed for tension, proof load ,and wedge load tests of bolts and nuts. Thread Specifications Table PART NUMBER THREAD SPECIFICATIONS F-JLL305A1 M5 to M20 F-JLL305A2 F-JLL605A1 M5 to M24 F-JLL605A2 F-JLL106A1 M5 to M30 F-JLL106A2 The bolt length (l) should be no less than 3 times of the nominal diameter of bolts (d), l≥3d.
Component Identification The fixture consists of two assemblies: upper assembly indicated by Figure 1 and Figure 2; Lower assembly indicated by Figure 3 and Figure 4. The wedge faces (Part 3) have markers for pairs, use wedge faces which have same markers together.
Figure 2 Parts of Upper Assembly (F-JLL305A1/ F-JLL305A2) Parts of Upper Assembly CALLOUT DESCRIPTION 1 Upper Joint 2 Upper Protection Plate 3 Wedge Face 4 Leading Block 1 5 Leading Block 2 6 Leading Block 3 7 Allen Screw M6×16 8 Allen Screw M5×16 MTS Fundamental™ Bolt Grips and Nut Grips Introduction 7
Figure 3 Parts of Lower Assembly (F-JLL605A1/ F-JLL605A2/ F-JLL106A1/ F-JLL106A2) Parts of Lower Assembly CALLOUT 8 Introduction DESCRIPTION 1 Lower Joint 2 Lower Protection Plate 3 Wedge Face 4 Square Nut 5 Leading Block 4 6 Leading Block 5 7 Leading Block 6 8 Allen Screw M6×16 9 Hexagon Spanner (5mm) MTS Fundamental™ Bolt Grips and Nut Grips
Figure 4 Parts of Lower Assembly (F-JLL305A1/ F-JLL305A2) Parts of Lower Assembly DESCRIPTION CALLOUT 1 Lower Joint 2 Lower Protection Plate 3 Wedge Face 4 Leading Block 4 5 Leading Block 5 6 Leading Block 6 7 Allen Screw M6×16 8 Allen Screw M5×16 MTS Fundamental™ Bolt Grips and Nut Grips Introduction 9
Introduction MTS Fundamental™ Bolt Grips and Nut Grips
Safety General Safety Practices: Grips and Fixtures This section provides general information about safety issues that pertain to MTS systems that use grips and fixtures. These issues include statements to the intended use and foreseeable misuse of the system, definitions for the graphical hazard labeling that is affixed to your product, and other (more general) safety information that relates to the high-pressure and high-performance characteristics of MTS static hydraulic and electromechanical systems.
It is very important that you study the following safety information to ensure that your facility procedures and the system’s operating environment do not contribute to or result in a hazardous situation. Remember, you cannot eliminate all the hazards associated with this system, so you must learn and remain aware of the hazards that apply to your system at all times.
A crush point exists between the grips. Whenever possible, use tongs or a similar tool when handling the specimen during specimen installation. Never allow any part of your body to enter the path of machine movement or to touch moving machinery, linkages, hoses, cables, specimens, and so forth. These present serious crush points or pinch points. Locate and read hazard placards/labels Find, read, and follow the hazard placard instructions located on the equipment.
Wear proper clothing Do not wear neckties, shop aprons, loose clothing or jewelry, or long hair that could get caught in equipment and result in an injury. Remove loose clothing or jewelry and restrain long hair. Remove flammable fluids Remove flammable fluids from their containers or from components before you install the container or component. If desired, you can replace the flammable fluid with a non-flammable fluid to maintain the proper proportion of weight and balance.
Handle chemicals safely Whenever you use or handle chemicals (for example, cleaning fluids, hydraulic fluid, batteries, contaminated parts, electrical fluids, and maintenance waste), refer to the appropriate MSDS documentation for that material and determine the appropriate measures and equipment required to handle and use the chemical safely. Ensure that the chemical is disposed of appropriately. Know system interlocks Interlock devices should always be used and properly adjusted.
Know the causes of unexpected actuator motions 16 Safety The high force and velocity capabilities of MTS actuators can be destructive and dangerous (especially if actuator motion is unexpected). The most likely causes of unexpected actuator response are operator error and equipment failure due to damage or abuse (such as broken, cut, or crushed cables and hoses; shorted wires; overstressed feedback devices; and damaged components within the servocontrol loop).
Installation The grips are usually assembled before shipment. Inspect and clean the parts Make sure you have all the parts. Check to see if the parts are correct. All parts should be free of deformities or surface damages, and the screw holes should be free of iron filings. Clean all parts before assembling. Assembly Refer to the component identification illustrations in the Introduction section for the location of parts in the following paragraphs.
Open the grips of the testing machine. Make sure all of the small pistons of grips withdraw totally. Dismount the existing wedge faces from the grips and clean the grooves. F-JLL605A1 F-JLL605A2 F-JLL106A1 F-JLL106A2 Install the upper assembly according to actions shown in Figure 5. Baffle Board Cushion Plate Upper Crosshead Hexgon Spanner (6mm) for M8×16 Allen Screws Figure 5 Installation Procedure of Upper Assembly 1.
F-JLL305A1 F-JLL305A2 Install the upper assembly according to actions shown in Figure 6. Baffle-Board Cushion Plate Upper Crosshead Figure 6 Installation Procedure of Upper Assembly 1. Pick out two wedge faces which have the same marks, and mount one wedge face into the upper grip as per ① and lock it with the baffle-board. 2. Mount another wedge face into the upper grip as per ② and lock it with the baffle-board. 3. Mount the upper assembly on the square nut as per ③, ④.
Installation MTS Fundamental™ Bolt Grips and Nut Grips
Operation Contents Bolt Tests 21 Proof Load Test for Nuts 26 Tests for Other Types of Specimens 29 Bolt Tests Testing is dangerous because the broken specimen may be projected violently from the testing zone. The projected specimen can cause personal injury. Close the protection plates of the fixtures and clear the personnel in front of the fixtures before testing. Specimen Refer to Thread Specs Table in the Introduction section of this manual.
The test can not be performed with the wrong loading plates and threaded adapter. Be sure to choose the appropriate loading plates and threaded adapters for the specimen.
1 2 3 Figure 8 Proof Load Test (M12–M30) CALLOUT DESCRIPTION 1 Loading Plate (M12–M30) 2 Specimen 3 Threaded Adapter (M12-M30) WARNING Debris can be discharged as a result of testing. Debris can cause injury to personnel and damage to equipment. Be sure to close the protection plates of the fixture and clear the personnel in front of the fixture before testing. Tensile test Wedge load test You can install the fixture and specimen the same as with the proof load test.
Figure 9 Loading Plate (M5-M10) Figure 10 Wedge Loading Plate (M12-M30) The test can not be done if mounting the specimen on the opponent position. Be sure to make the loading plate surface engraved with "UP" on top and touching the head of the bolt during the test. There are spec marks on the wedge loading plates and threaded adapters, choose appropriate loading plates and threaded adapters for the specimen (See Figure 11).
WARNING Debris can be discharged as a result of testing. Debris can cause injury to personnel and damage to equipment. Be sure to close the protection plates of the fixture and clear the personnel in front of the fixture before testing.
Proof Load Test for Nuts Choose appropriate fixtures for the specimen. There are two kinds of fixtures for different specimens (See Figure 12 and Figure 13). All of the loading plates, threaded rods, high strength bolts and threaded adapters have spec marks. Choose those parts according to the marks. For same thread specs, the hole of the nuts’ loading plate is smaller than that of the bolts’ loading plate. Do not misuse these loading plates. WARNING Debris can be discharged as a result of testing.
Proof load test for nuts (M12 to M30) Choose appropriate loading plates, nut loading plate and high strength bolt. See Figure 13 for installation.
Upper Protection Plate Spec Mark ex.
Tests for Other Types of Specimens By using appropriate loading plates, thread rods, thread adapters, and high strength bolts, the fixtures can perform tests for specimens of fine pitch threads and inch threads. Double-headed studs can also be tested. If you want to test these kinds of specimens, you must state it clearly in your order.
Tests for studs If you want to run tests for studs, you should use high strength nuts (no less than class 12). One end of the stud should be connected to the high strength nut; the other end be connected to the threaded adapter. Figure 14 illustrates the installation manner. Refer to bolt proof load test for details.
Appendix A Optional Fixture References M5,M6, M7,M8,M10 Bolts Threaded adapter Loading plate 4° wedge loading plate Nuts Determined by the specimen and test method, one for each M12,M14,M16,M18, EXAMPLES OF M20,M22,M24,M27,M30 MARK Determined by the specimen and test method, one for each M6,M20 M6,M20 4°×M20 6° wedge loading plate 6°×M20 10° wedge loading plate 10°×M20 M4 M10 -- REMARK aperture designed by medium clearance as per GB/T 5227 Loading plate for nuts Determined by the specimen
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