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Straining Unit |
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This consists of a hydraulmic cylinder
and a table coupled with the ram of
hydraulic cylinder, mounted on robust base.
The cylinder and the ram are individually
lapped to eliminate friction. The cross-head
is connected to two screwed columns and is
driven by a motor, for rapid adjustment of
test height. |
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An elongation scale with a minimum
graduation of 1.0 mm, is provided to measure
the deformation of the specimen. |
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Compression, transverse, bending, shear and
hardness tests are conducted between the
lower cross head and the table. |
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Control Panel : |
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The control Panel consists of a power
pack complete with drive motor and an oil
tank, control valves a pendulum dynamometer
a load indicator system and an autographic
recorder. |
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Power Pack : |
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The power pack generates the maximum
pressure of 200 kgf/cm2 the
hydraulic pump provides continuously
non-pulsating oil flow. Hence the load
application is very smooth. |
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Hydraulic Controls : |
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Hand operated wheels are used to control
the flow to and from the hydraulic cylinder.
The regulation of oil flow is infinitely
variable incorporated in the hydraulic
system is a regulating valve which maintains
a practically constant rate of table
movement. |
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Load Indicator System : |
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This system consists of a large dial and
a pointer. A dummy pointer is provided to
register the maximum load reached during the
test. Different measuring ranges can be
selected by operating the range selection
knob. An overload trip switch is
incorporated which automatically cuts out
the pump motor when the load range in use is
exceeded. |
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Pendulum Dynamometer : |
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This unit permits selection of favorable
hydraulic ratios producing relatively small
frictional forces. Pressurised oil in the
loading cylinder pushes up the measuring
piston proportionately and actuates the
special dynamometer system. The piston is
constantly rotated to eliminate friction.
The dynamometer system is also provided with
an integral damper and ensures high
reliability of operation. The load
transmitted to the dynamometer is
transferred through a pendulum to the load
indicator.
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Autographic Continuous Roll
Load-Elongation Recorder : |
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This unit is of the pen and drum type
and is supplied as standard. The horizontal
motion of the pen produces the load ordinate
of the diagram and the drum rotation
produces the extension ordinates in the
ration of either 1:5 or 1:10.
A continuous roll of graph paper is stored
inside the drum and is easily replaced. |
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Accuracy & Calibration : |
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AII FIE Compression Testing Machines are
closely controlled for sensitivity, accuracy
and calibration during every stage of
manufacture. Every machine is then
calibrated over each of its measuring ranges
in accordance with the procedure laid down
in BS : 1610 : Part 1 :1992 and IS 1828.
An accuracy of + 1.0% is guaranteed
from 20% from 20% of the load range selected
to full load. Below 20% of the selected
range, the maximum permissible error is 0.2%
of the full load reading. |