Mts Series 647 Hydraulic Wedge Grips Manuel d'utilisateur télécharger pdf (Page 88)

Install/Remove Test Specimen

Install a Specimen

Prerequisite steps for installation.

• Before installing the specimen, install the appropriate set of wedges for the specimen to be tested. Use

the installation instructions in this chapter for the type of wedge you are using.

•

Warning:

Make sure that the specimen shank is within the required tolerance.

Failure to comply with specimen tolerances can cause wedges to fail.

Make sure that every specimen is within the tolerance listed for the type of wedge and type

of specimen. Tolerances are listed for various wedge types in the “Introduction” chapter.

Make sure that the specimen shank is within the tolerances listed for the type of wedge you are using.

Size and tolerance for various types of wedges are listed in the “Introduction” chapter.

Warning:

Grip installation is dangerous because it occurs within the crush zone of the force train while

full hydraulic pressure is applied and actuator movement is required during the installation.

Unexpected actuator movement can cause personal injury and damage to the equipment.

Take every precaution to avoid unexpected actuator movement while installing the grips.

Adjust the grip supply pressure to the minimum level as determined in “Determine the Gripping Pressure”

(see your load unit or hydraulic grip supply product information manual).

2. Select force control and the most sensitive range available at the controller.

Note:

Displacement control is not recommended for specimen installation. If you must use displacement

control, use extreme care not to apply specimen-damaging forces when adjusting the grip position.

3. Release the upper and lower grips using the hydraulic grip supply controls.

Note:

When using vee-notched or round wedges (for use with round specimens) skip to Step 6.

4. If you are working with flat wedges, loosen the cap screws securing the specimen guides on the wedges.

Adjust the specimen guides so as to allow the specimen to be centered in the grip. Tighten the socket

head cap screws.

5. Apply full system hydraulic pressure according to applicable system procedures. Use extreme care not

to cause rapid actuator movement when performing the following steps.

88 Series 647 Hydraulic Wedge Grips Reference Manual

Operation

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Mts Series 647 Hydraulic Wedge Grips Manuel d'utilisateur Page 88