Performing a Test M14-13655-EN
6-2
Performing a Test
Gravity Driven Operation
In the gravity mode, you can drop the crosshead from any height in manual or automatic
mode. When gravity mode operation is automatic, the hoist returns the crosshead to the
position of the height limit magnet mounted on the height scale.
The following sections detail a complete example of operation in both of these modes.
Manual 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 gravity driven manual mode:
1.
Attach the desired weight to the crosshead.
2.
Set the top control pendent switches to MAN and GRAV. If a pneumatic clamp is
installed, set the clamp on/off switch to ON.
3.
Place the specimen in the specimen support fixture.
4.
Remove any tools, other foreign objects, and the safety "H" bar from the enclosure
and close the doors. The ARM button illuminates.
5.
Position the crosshead at the desired height using the UP and DOWN buttons.
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.
If a pneumatic clamp is installed, when you release the arm button , the clamp plate
rises. When a ductile specimen has been tested, it must be stripped from the tup. To
strip the specimen, press and hold the CLEAR button on the pendent. After the
center piston of the pneumatic clamp is fully raised, press the ARM button to bring
the clamp plate down and strip the specimen from the tup.
9.
Press the DOWN button to retrieve the crosshead. The latch mechanism stops
automatically and engages the crosshead.
10.
Press the UP button to raise the crosshead to the desired height.
11.
Insert the safety "H" bar.
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