MTS Landmark Tabletop - Manual (Page 64)

Note:
Always lower the crosshead to where you want it. The pressure remaining in the lift cylinders after
raising the crosshead can slightly shift its alignment. Lowering the crosshead to its final position
removes this pressure and improves alignment.
4. Tighten the crosshead clamping bolts to secure the crosshead in place.
Torque the clamping bolts according to the torque settings shown for Step 1 in the following table. Use
the bolt sequence shown above. Then torque the crosshead bolts to the values in Step 2 and so on until
Step 4 is complete.
Step 4 Step 3 Step 2 Step 1
190 N·m (140 lbf·ft) 190 N·m (140 lbf·ft) 171 N·m (126 lbf·ft) 20 N·m (15 lbf·ft)
5. Position the clamp ring.
Slide the clamp ring on the column just under the crosshead position and tighten it.
Adjust the Grip Clamp Rate
The clamp rate determines how fast the grip can clamp a specimen. Experiment with a dummy specimen to
find the best setting.
1. Ensure that both the upper grip control and lower grip control are in the unclamp position.
2. Turn on electrical power at the test controller.
3. Turn on low or high hydraulic pressure.
4. If needed, move the crosshead or actuator so that the dummy specimen can be easily installed in the
lower grip.
Warning:
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash specimens.
Be careful when working in a crush zone. To reduce the hazards in this procedure, observe
the following:
Set and enable displacement interlocks to limit the actuator’s movement.
Ensure that the crosshead is locked.
Ensure that the columns are clean and dry.
Keep your hands out of the crush zone except when performing the steps needed to complete
this procedure.
64 MTS Landmark™ Tabletop Load Units Product Information
Operation