MTS Advantage Wedge Action Grips - Manual (Page 29)

Manual Name Operation 29
2. Open the upper and lower grips.
Specimen slippage during the test can damage the grips.
Specimen slippage typically occurs when:
• Insufficient grip pressure is used to securely grip the specimen.
• Grip faces or wedges with rounded or flattened serrations are used.
• The specimen is harder than the wedge or face material.
Do not exceed the maximum pressure rating of the grip. Increasing the pressure
setting to hold round specimens can reduce the life of the vee-notched wedges.
Do not install specimens with hardness of Rc 52 or greater.
3. Place the specimen in the lower grip allowing a space of at least 3 mm (0.12
in), but not greater than 6 mm (0.25 in), between the bottom of the specimen
and the bottom inner edges of the lower grip wedges. Turn the grip handles
until specimen is firmly secured in place.
4. Lower the crosshead or extend the actuator until the specimen is positioned
in the upper grip allowing a space of at least 3 mm (0.12 in) but not greater
than 6 mm (0.25 in), between the top of the specimen and the inner top
edges of the wedges. Turn the grip handles until the specimen is firmly
secured in place.
CAUTION
Grips Closed Grips Open