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Static Shear Tester Operating Instructions (SS-RT-10, SS-HT-8, SS-HT-30)
THEORY OF OPERATION
All shear testers are used to measure the time for adhesive samples to fail in shear mode. In
accordance with a test method, samples are prepared, applied to a standard test surface, and
subjected to a constant gravity force. The time it takes for the sample to fail by falling off the
test surface is measured and recorded for determination of performance of the adhesive in a
shear position.
SHEAR BANK CALIBRATION
It is important to calibrate the Shear Bank before testing. The majority of shear test methods
require a 2 degree back angle to vertical for proper position to conduct a shear test. The
following procedure provides information and method for setting your Shear Bank correctly to
perform a shear test.
CALIBRATION PROCEDURE
1. With the aid of a level, use the adjustable feet at the four corners of the Shear Bank to
position the Shear Bank level in both the front to back and left to right directions.
2. Using an Angle/Level adjust the Panel Rack so that there is a 2 degree backward angle
from vertical. There are score marks on the Panel Rack Mounting Drum indicating the
proper angle. These marks were set in the factory for a two degree angle with the Shear
Bank level.
3. The Adjustable Tension Springs are tighten completely down for shipping. These
springs provide the tension to hold the Trip Plate in the up or off position when a test
weight is not present. With an allen wrench the socket head bolt holding each spring
can be adjusted to allow the Trip Plate to close with as little as a 100 gram test weight.
Turn the bolt counter clockwise to loosen the spring tension and enable lower weights to
cause the Trip Plate to close.
Your shear bank is now positioned correctly for use in doing shear testing.
RUNNING A TEST
There are numerous test methods for conduction shear test published by many agencies. The
most common of these require preparing either a ½ inch or 1 inch wide sample.
