MTS Series 609 Alignment Fixture - Manual (Page 61)

Adjust the Concentric Alignment
Series 609 Alignment Fixture Product Information Alignment Procedure 61
The following figure shows typical readings before and after an adjustment.
Thin Flat Specimens – Reduce the “S” Bend
If you are using thin flat specimens with three gage levels, four gages per level,
adjust the concentricity adjustment screws to move the upper and lower readings
toward the middle gage readings.
You are overadjusting the concentricity screws if the average of either the upper
or lower A side’s gages cross through the average of the A side’s middle gages.
For example, you have overadjusted if the average reading of the A side’s upper
gages (now 16) drops below 10.5 (the average reading of the A side’s middle
gages).
4. Clamp and unclamp both ends of the specimen, one end at a time.
A. Maintain a zero force on the actuator so that the grips do not move
when you unclamp the specimen.
B. Repeat this step as necessary.
Adjust
Upper
Middle
Lower
Upper
Middle
Lower
s (typical readings before adjustment)
t (typical readings after adjustment)
Strain Readings
A
B
A side
B side