Performing a Test
6-5
Operation
11. Press the UP button to raise the crosshead to the desired height.
12.
Insert safety "H" bar.
13.
Remove the specimen.
14.
Press the CLEAR switch to raise the center piston on the pneumatic clamp. Use the
wire brush provided to clear away debris.
Automatic Mode
WarningWarning
Install the “H” bar to prevent the crosshead from falling before workingInstall the “H” bar to prevent the crosshead from falling before working
within the safety enclosurewithin the safety enclosure
To operate the 8250 Machine in pneumatically driven automatic mode:
1.
Attach the desired weight to the crosshead. Do not accelerate 50 lb. (22.7kg), 75 lb.
(34kg) or 100 lb. (45kg) crossheads to velocities above 14.5 ft/s (4.4 m/s).
2.
Set the control pendent switches to AUTO, PNEU and, if a pneumatic clamp is
installed, set the clamp ON/OFF switch to ON. Note that when the AUTO button is
pressed, the crosshead automatically rises to the top position.
3.
Set the pneumatic assist air pressure, using the regulator on the top of the rear motor
enclosure.
4.
Place the specimen in the specimen support fixture.
5.
Remove any tools, other foreign objects, and the safety "H" bar from the enclosure
and close the doors. The ARM button illuminates.
6.
Press and hold the ARM button. The audible alarm sounds and the pneumatic clamp
(if installed) closes.
7.
While still holding the ARM button, press the FIRE button. The latch hook opens,
allowing the crosshead to fall and strike the specimen.
8.
When a pneumatic clamp is installed, the system automatically strips the specimen
from the tup after the test.
9.
The latch assembly automatically retrieves the crosshead and raises it back to the top
position.
10.
Insert safety "H" bar.
11.
Remove the specimen.
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