MTS Axial Extensometers - Manual (Page 27)

Configuration 27
Slide Spring Components
1. Zero the arms of the extensometer. Depending on the extensometer,
this can be accomplished using the zero pin, stop block, or a special
fixture.
2. Using a small adjustable wrench, grasp the sides of the upper arm.
.
3. While securely holding the extensometer arm, loosen the socket
head cap screws with a hex wrench.
4. Repeat Step 2 and Step 3 to loosen the socket head cap screws on
the lower arm.
5. Remove the knife edge hold-downs, knife edges, and attachment
hooks by removing both socket head cap screws from each
extensometer arm.
6. Loosely attach the upper and lower attachment adapters to the
respective extensometer arm using the socket head cap screws
removed in Step 5.
7. Slide the knife edge between the extensometer arm and the
attachment adapter and between the two socket head cap screws.
• Use straight knife edges for round specimens.
• Use three-point knife edges for flat specimens. Ensure that the
single-point contact knife edge is in the upper arm and the
two-point contact knife edge is in the lower arm.
8. Tighten the socket head cap screws only enough to secure the knife
edges.
9. Insert the alignment rod into the attachment adapter as shown in
the Attachment Adapter Alignment figure.
Hex Wrench
Adjustable
Wrench