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Dakota Ultrasonics
A minimum of three sample bolts, which are representative of the bolt
type and geometry for which the Temperature Factor is to be determined.
NOTES:
The Dakota Ultrasonics MiniMax must be calibrated, or zeroed, as described in
the procedure entitled Measuring System Zero in 8.1.
The sample bolts should be left to soak at the measured temperature points for a
period of not less than 20 minutes, to insure that temperature is uniform
throughout the sample.
If a water bath is used, care must be taken to avoid immersion of the ultrasonic
transducer.
Determination of the Temperature Factor is accomplished by solving the equation:
Where:
(
)
L
L
0
T
T
p
(
L
T
T
0
T
Temperature Factor
1) Stabilize the sample bolt at approximately 48
used this is accomplished in a stirred bath of ice and water. Measure and
record this minimum temperature as T
Note: The following steps assume that the user has performed the steps in the
previous section and calibrated the velocity. Therefore, the velocity has been
adjusted, approximate length already entered, and the MiniMax is currently
setup and ready to measure in elongation mode.
2) Apply a drop of couplant to the bolt or transducer, and attach it to one end of
the bolt. Rotate the transducer clockwise and counter clockwise applying a
small amount of pressure to eliminate any excess couplant between the
L
= Ultrasonic Length at Beginning Temperature (T
0
6
10
L
= Ultrasonic Length at Ending Temperature (T)
)
T
T
= Beginning Temperature
0
T = Ending Temperature
Calibrating the Temperature Factor
0
F. If the water bath method is
0.
104
)
0
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