MTS Model 680-01 High-Temperature Grips - Manual (Page 23)

Model 680.01 High-Temperature Grips 23
Preparation
Ensure that the threads of all threaded components in the force train (between the
load cell and the actuator rod) are clean and in good condition.
As necessary, clean the connector studs and the internal threads of the force train
element(s) with a wire brush. Inspect all threads for signs of particle
contamination or corrosion. All damaged threads should be repaired or the
component should be replaced.
Installation procedure
The following procedure assumes that the actuator is mounted in the base of the
load unit and the force transducer is mounted to the crosshead. If you have a load
unit with the actuator mounted to the crosshead, make the appropriate changes to
the following procedure.
1. Set up the load unit.
A. Turn on the system hydraulic pressure.
B. Adjust the actuator and crosshead position as necessary to allow
adequate room to install the grips.
C. Turn the hydraulic pressure off and ensure that system hydraulic
pressure has been reduced to zero before proceeding.
D. Lubricate all of the surfaces that will contact each other (screw threads,
spacers, and so forth) with Molykote G-n paste.
2. Mount the lower grip.
Mount the lower grip to the actuator piston rod. The attachment kit drawing
shows what components (such as shims, spiral washers, and so forth) should
be installed.
Note Insert a plug (with the same diameter as the stud) of compliant material,
such as cardboard or styrofoam, into the threaded mounting holes in
each grip, actuator, and force transducer. This will aid future grip
removal.
A. Thread the stud into the actuator. The connector stud should turn freely.
If any resistance is encountered, disassemble and correct the problem
before proceeding.
B. Add any required shims, spacers, or spiral washers to the stud. Ensure
that the spiral washers are set to their minimum thickness.
C. Position the lower grip to align it with the connecting stud and stabilize
the grip. Slowly screw the lower grip into the lower element of the
force train until it is snugged tight against the spiral washers. Ensure
that the spiral washers remain set to their minimum thickness.
3. Mount the upper grip.
Mount the upper grip to the force transducer on the crosshead. The
attachment kit drawing shows what components (such as shims, spiral
washers, and so forth) should be installed.
Note Ensure that the force transducer is properly aligned (see your load unit
manual).
A. Thread a stud into the upper grip.