ASTM ASTM-3080 2050 Benutzerhandbuch - Seite 2
Blättern Sie online oder laden Sie pdf Benutzerhandbuch für Elektrowerkzeug ASTM ASTM-3080 2050 herunter. ASTM ASTM-3080 2050 5 Seiten. Dead weight direct/residual shear device
Seite druckenpressures to dissipate. The remainder of this procedure presents a discussion on the sample preparation for testing, equipment
preparation, and running the direct shear machine. Refer to ASTM D-3080 for procedures and details on the test methods.
INSTALLATION
The unit requires unbolting from the skid. The dead weight lever arm requires assembly, as it was repositioned for shipping. First
remove all the tape and the lever arm adjusting screw support bracket on the right hand frame. Reposition the arm above the
support bracket holes and reinstall the support bracket. Install the 3.5" diameter counter balance weight and the weight platform.
SETUP OF MACHINE-The direct shear requires a level floor for best results. Holes are provided in the frame for bolting to the
floor.
DIAL INDICATOR ROD - Screws into the top platform to the right of the vertical pull-down rod
DIAL INDICATOR CLAMPING ARM - Attaches to the above rod
DIAL INDICATOR - CONSOLIDATION - Attach to the clamping arm with the screw provided
DIAL INDICATOR - SHEAR - Attach to the angle bracket on the top platform, right front
LINEAR DISPLACEMENT TRANSDUCER (Optional) - Attach to the angle bracket on the top platform using the clamping block
LOAD CELL - Connect the load cell to the support casting at the right end of the direct shear using the two knobs. Adjust the
knobs so that the load cell is as far to the right as possible. This will allow room for assembling the water chamber and the shear
rings with minimum interference. Connect the 5 pin din plug on the load cell to the socket at the rear of the cabinet. An analog
output plug (3 pin) is also provided for connection to data acquisition.
WATER CHAMBER - Special care should be taken to see that the two (2) roller bearings between the water chamber and the base
slide tracks are properly cleaned and contain a slight amount of oil during and after use. We advise using a cover over the direct
shear after use to eliminate dust from entering the precision slide assembly. The roller bearings should be set in the middle of the
bearing tracks with the water chamber shear rings centered to the load arm. The main drive shaft should be at its "home" position.
This will place the sample load pad in the center of the cross arm for consolidation.
SHEAR RINGS - The shear rings are held together with (2) stainless steel screws with lifting knobs. There are also (4) screws for
adjusting the gap between the rings once consolidation has been reached. The gap is adjusted by turning the screws clockwise
from the finger tight position. One full turn will give .031" gap. There is a line scribed on the adjusting knob for determining how
much gap each screw has provided. The screws should be turned evenly to maintain a proper gap. At the bottom of each screw is
a nylon glide which keeps the top shear ring from dropping during the test.
LOAD CELL READOUT - The S type load cell is connected to the rear of the cabinet with a five pin din plug. The readout will be
activated when the main power switch is turned on. A tare button is located to the left of the readout and is used to zero the
readout if required. A 3 pin din plug is provided for hook-up to data acquisition. Pin #1 is "+" and pin #3 is "-". The output is 0-10
VDC. See separate instructions and calibration sheet on the load cell/readout.
POWER SWITCH - Located at the bottom of the control panel, an indicator light is present when power is turned on.
STRAIN RATE SELECTOR - The strain rate control is set with thumb wheel selectors. The switches are direct reading in
inches/minute with an implied leading decimal point. Once the rate is set and the test is begun, the switch setting is ignored until
the stop switch is pressed or a limit switch is tripped.
LIMIT SWITCHES - These switches are located on the platform behind the water chamber. Adjustment of these switches is made
by loosening the Phillips-head screws and moving the limit switch assembly in the direction desired. The home position has been
set so that the load cross arm is in the middle of the shear rings. The limit switch has been set for .8" travel and may require
resetting depending on the test parameters.
CAUTION: THE TRAVEL LIMIT OF THE DRIVE SHAFT IS DEPENDENT ON THE LIMIT SWITCH SETTINGS. DO
NOT OPERATE THE MOTOR WITH THE WATER CHAMBER DISCONNECTED BECAUSE THIS WILL
MAKE THE LIMIT SWITCHES INOPERABLE AND CAUSE DAMAGE TO THE SHEAR SHAFT.
STOP SWITCH - Momentary push button to stop the motor.
DIRECTION SWITCH - Momentary (spring loaded) switch. After setting the desired shear rate, moving the switch in the desired
direction will initiate movement. This switch will then become inactive until the stop button is pressed or a limit switch is activated.
The left position will move the water to the left. It will continue until the water chamber activates the limit switch. At this time, the
limit indicator light will be lit. The right switch position will move the shear box to the right until the home limit switch is made. SEE
ABOVE CAUTION.
HOME & LIMIT INDICATORS - Used to indicate the limit of travel of the shear box.
FUSE -1 amp SLO BLO fuse located in the cabinet rear
SHEAR BOX ASSEMBLY
Be certain the tracks on the platform, shear box bottom and the roller assemblies are clean and are lightly oiled. Place the shear box