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Coupling adapters
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1. Insert the adapter into the base beam, noting the orientation of the locating pin on
the bottom of the adapter. There are a number of locating pin holes on the base beam
to allow for different orientations of the base adapter.
2. Insert a 14 mm hex key into the base adapter, ensuring that it fits into the screw at
the base of the adapter.
3. Use the torque wrench to tighten the screw according to the following list:
• for 34TM-5 and 34TM-10 frame, torque to 60 N-m (44.3 ft-lb)
• for 34TM-30 frame, torque to 120 N-m (88.5 ft-lb)
• for 34TM-50 frame, torque to 200 N-m (147.5 ft-lb)
4. Remove the hex key and insert the compression spring.
Coupling adapters
Coupling adapters let you attach grips and fixtures of different sizes to the load cell and
base adapter, providing more options for testing. There are two primary types:
• For tension testing only:
Tension coupling adapters, also known as self-aligning coupling adapters, which
provide a swivel connection and connect between clevis pin type interfaces. The
swivel action allows the grip or fixture to self-align in the direction of the test load,
thus minimizing any bending load on the specimen.
• For tension or compression testing:
Rigid coupling adapters which also connect between clevis pin type interfaces but
use check nuts to provide fixed connections. This type can also have a threaded
interface. These couplings are not self-aligning and the load string alignment is
dependent on the accuracy of load cell alignment during installation.
When assembling the load string, you may need to use adapters if the load cell
interface, or base adapter interface, differs from your grip interface. A coupling adapter
creates a secure connection between these two different interfaces.
If your grip or fixture interface is the same size as your load cell interface, then you can
connect these directly and you do not need an adapter. If, however, you need the self-
6 Type D base adapter
7 Load cell anti-rotation pin 705K84
8 Load frame base beam
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