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Removing Preload
Product Support: www.instron.com
• spanner wrench (1/4 in.) - Instron part #80-4-4
Checklist
Check for the following conditions before you preload the grips:
• The jaw faces are installed.
• The side plates are secure. If you are using a 50 kN wedge grip, ensure that either
the spacers or side plates are fitted on the grip and are secure.
• If using a 50 kN grip, check the thickness of your specimen and ensure that the
appropriate spacers or side plates are installed. Refer to “Installing the Spacers
and Side Plates” on page 29 for additional information.
• The attachment kits are installed but loose.
• The Load channel indicates a zero load.
• The electronic load limits are set to protect the weakest load string component.
Procedure
1. Install a specimen according to section “Installing a specimen” on page 35.
2. Set the control electronics for a tensile load 10 to 15% greater than the highest load
you will be applying during your test.
3. Using the spanner wrench, turn each locknut against the mounting device (load cell,
baseplate clevis, or actuator).
4. Repeat Step 1 through Step 3 for the other grip.
5. Set the electronic controls for a zero load.
6. Refer to section “Removing a Specimen” on page 37 for instructions on removing
the specimen.
Removing Preload
You must remove the load string preload before removing the grips from the system. To
remove the load string preload, you must install a specimen capable of withstanding a
tensile load equal to the current load string preload.
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