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Weight Sets are required to apply the consolidation load and are available in both Pound and Kilogram sets.
Total Load at 10:1
Model
Total Mass
HMA-727
54.5lb
HMA-732
109.1lb
1,091lbf (16tsf)
HMA-729
218.2lb
2,182lbf (32tsf)
¹tsf values indicate force applied to a 2.50in diameter specimen using a 10:1 beam ratio.
Kilogram Weight Sets
Total Load at 10:1
Model
Total Mass
Beam Ratio
HMA-730
32kg
320kg
HMA-725
64gk
640kg
HMA-731
88kg
880kg
UNPACKING & SETUP
• Inspect your Direct Shear Machine for damage,
remove from the pallet.
• Review connections section and install necessary
components.
• Assemble the dead weight lever arm. Remove all
packing material from arm and adjusting screw sup-
port bracket. Reposition the arm above the support
bracket holes and reinstall the support bracket. Next
install the 3.5in diameter counterbalance weight and
the weight platform.
CONNECTIONS
Vertical Displacement Transducer Rod – Screws
into the top platform to the right of the rear pull-down
rod.
Vertical Displacement Transducer Clamping Arm –
Attach to the above rod.
Vertical Displacement Transducer – Consolidation –
Attach to the clamping arm with the screw provided.
Connection is made at the rear of the readout box.
Horizontal Displacement Transducer – Shear – At-
tach to the threaded rod on the angle bracket-top plat-
form, right front. Connection is made at the rear of the
readout box.
Air Line – A constant supply of air is required. The air
inlet air pressure should not exceed 200 psi, nor should
it ever be less than 20 psi higher than the highest pres-
sure setting. The connection is a ¼" Swagelok, located
in the rear of the cabinet. Insert the tubing into the fit-
ting until it bottoms out. With the nut finger tight, tighten
the fitting 1 ¼ turns with a wrench. Do not over tighten.
Load Cell – Connect the load cell to the support cast-
0.852lb (1/8tsf)
Beam Ratio¹
545lbf (8tsf)
2
2
2
Included Weight Sets
1kg
4kg
4
3
4
5
4
5
Pound Weight Sets
Included Weight Sets
1.704lb (1/4tsf)
3.409lb (1/2tsf)
1
1
1
1
1
1
ing 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 assem-
8kg
bling the water chamber and the shear rings with min-
2
5
imum interference. Connection is made at the rear of
8
the readout box.
Mini USB 2.0 Port – Connection is made at the rear of
the readout box to a computer.
Water Chamber – Special care should be taken to
see that the four (4) 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 main drive shaft should be at its home
position. This will place the sample load pad in the cen-
ter of the crossarm for consolidation.
Shear Boxes (sold separately) – The shear rings are
held together with (2) stainless steel screws boxes.
There are also (4) screws for adjusting the gap be-
tween 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 provid-
ed. 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.
FRONT PANEL CONTROLS
The strain rate is controlled from the front panel thumb-
wheels. Machine must be plugged in to a properly wired
grounded receptacle with appropriate electrical current.
PANEL CONTROLS — POWER & SHEAR RATE
Power Switch – An indicator light is present when
power is turned on.
Strain Rate Selector – The strain rate is set with
thumbwheel selectors. The switches are direct reading
in inches/minute with an implied leading decimal point.
2
6.818lb (1tsf)
13.635lb (2tsf)
1
1
1
1
1
1
27.270lb (4tsf)
1
3
7
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