User guide

Test Setup Using Standard Flexures
Series 215 Rotary Actuator Product Manual Operation
49
Calculate bending
moment (M
1
)
Calculate the bending moment (M
1
) that is applied to the actuator and reaction
bracket when equipped with standard flexures.
Calculate bending
moment (M
2
)
Calculate the bending moment (M
2
) induced in the test specimen with standard
flexures installed by using the following formula:
Calculate specimen
stress
Calculate the additional stress (S
B
) induced in the specimen due to base plate
twist by using the following formula:
The value 12.2 psi represents the amount of stress experienced by the specimen
under test and is an acceptable stress level. Typically, in a torsion test, stress
caused by reaction base or T-slot table twist should be zero or as close to zero as
possible. Specimen stress loading introduces unfavorable loads on the test