Dynatup 8250, Operating Instructions Manual

Page: 42 / 64

Adjusting the Velocity Detector M14-13655-EN
5-2
Adjusting the Velocity Detector
The steel flag on the edge of the crosshead should pass through the velocity detector
block before the tup hits the specimen. The velocity detector block is mounted on the
bracket to the right of the unit above the base plate.
Refer to the following sections for information on properly setting the velocity detector.
Refer to Figure 5-1 for an illustration of the velocity detector flag.
Figure 5-1. Velocity Detector Flag
Setting the Velocity Detector
To find the correct position of the velocity detector:
1. With a specimen in the support fixture, lower the crosshead until the tup rests on the
specimen.
2. Loosen the two screws that attach the velocity detector to its support bracket.
3. Slide the velocity detector up or down until the edge of interest of the flag (see Figure
5-2) is approximately 1/4 inch (6mm) below the center line of the velocity detector.
At high velocities, the velocity detector may have to be adjusted so that the edge of
the flag is more than 1/4 inch (6mm) below the center of the velocity detector.
4. Check that the flag passes through the center of the velocity detector slot.
5. Secure the velocity detector to the support bracket.
VELOCITY
DETECTOR
FLAG