MTS Series 646 Hydraulic Collet Grips - Manual (Page 42)

Series 646 Hydraulic Collet Grips 42 Installation
Note The label on the coupling indentifies which component should be
connected to each side of the coupling. Each end of the coupling has
different threads.
C. Turn on hydraulic pressure and raise the actuator rod until it is in full
contact with the end of the grip. Reposition the grip, as necessary, to
center it over the actuator rod.
D. Select the lower grip coupling set. Place the lower grip coupling half
with the threaded holes against the actuator and grip threads. Rotate it
back and forth, as necessary, until the threads mesh with the actuator
and grip threads.
E. Place the other coupling half against the actuator and grip threads.
While holding the two halves together thread the socket head cap
screws into the coupling until they are finger tight.
F. Check both ends of the coupling to ensure that the gap between the two
halves is approximately equal. If necessary, tighten and loosen the
socket head cap screws to achieve this.
G. Turn the hydraulic pressure off.
3. Tighten the lower grip.
With all the socket head cap screws finger tight, rotate the coupling
assembly in the direction shown on the coupling label until it is tight. This is
essential to ensure proper preloading of the coupling.
Tighten the socket head cap screws in the order shown in this figure, first to
10%, then to 50%, and finally to 100% of the torque specified on the label.
4. Mount the upper grip to the force transducer on the crosshead using an
adapter between the force transducer and the upper grip.
A. Place the force transducer mating adapter against the force transducer
and thread the socket head cap screws into the force transducer until
they are finger tight.
B. Tighten the socket head cap screws to secure the adapter to the force
transducer using the sequence shown in this figure.
1. Insert bolts, finger tight.
2. Turn coupling
to tighten joint
3. Torque bolts
11 ft-lbs / 14.9 N-m.
Axial Rating
Torsion Rating
25 kN
220 N-m
Actuator
Grip/Fixture
Lower Coupling
MTS Systems Corporation Mpls., MN. Patent Pending PN 466350-01
2 3
1 4
Torque Specification