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The FIE Spring Testing
Machine, Models St and CST,
incorporates design features
to enable high accuracy
testing with economy, speed
and versatility |
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Loading Accuracy as high
as + 1% |
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Four standard measuring
ranges available with auto
load-selector. |
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Deflection is read
directly on electronic
Electronic Digital Display. |
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Straining at variable
speeds to suit a wide range
of applications. |
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Autographic recorder
supplied as standard to
enable study of behavior of
springs |
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Motorised drive for rapid
adjustment of the height |
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High reading accuracy due
to large size of dial. |
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Large effective test space
enables testing of wide
range of springs. |
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Robust staining frame of
an extremely rigid
construction. |
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Safe operation ensured be
means of safety devices. |
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Fully enclosed and
protected pendulum. |
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Application : |
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FIE Laminated Spring
Testing Machine is designed
to test Laminated Springs
and Coil Springs under
compression and bending
loads. |
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Principal of Operation : |
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Operation of the
machines is by hydraulic
transmission of load from
the test specimen to a
separately housed load
indicator. The hydraulic
system is ideal since it
replaces transmission of
load through levers and
knife edges, which are prone
to wear and damage due to
shock on rupture of test
pieces. |
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Load is applied by a
hydrostatically lubricated
ram. Main cylinder pressure
is transmitted to the
cylinder of the pendulum
dynamometer system housed in
the control panel. The
cylinder of the dynamometer
is also of self-lubricating
design. The load transmitted
to the cylinder of the
dynamometer is transferred
through a lever system to a
pendulum. Displacement of
the pendulum actuates the
rack and pinion mechanism
which operates the load
indicator pointer and the
autographic recorder. The
deflection of the pendulum
represent the absolute load
applied on the test
specimen. |
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Return movement of the
pendulum is effectively
damped to absorb energy in
the event of sudden breakage
of a specimen. |
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Machine consists of : |
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Straining Unit |
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This consists of a "C"
type rigid frame with
hydraulic cylinder at its
top and adjustable main
testing tale is connected to
an upper cross-head through
two screwed columns can be
rapidly adjusted to test
height by means of motor. A
pair of trolleys is provided
on the table to take the
horizontal deflection of the
spring under loading. |
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Laminated springs are tested
by placing them on trolleys
provided on the table. Coil
Springs are tested by
placing them between the
compression plates. Hardness
test can also be conducted
with a suitable attachment. |
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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
valve a pendulum dynamometer
a load and deflection
indicating 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 in
the oil 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 and Deflection
Indicator System : |
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The load Indicator
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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The deflection indicator
system operates
electronically and
deflection is read directly
on the digital display with
least count of 0.1 mm. The
encoder is mechanically
coupled to the main
hydraulic ram for getting
signal of deflection. |
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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 special 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 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
ratio of either 1:1 or 1:2. |
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Accuracy & Calibration : |
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AII FIE Laminated Spring
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 : 1964 |
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FIE Spring Testing Machines
comply with Grade "A" of BS
: 1610 : 1964 and Grade 1.0
of
IS 1828 : 1975 An accuracy
of + 1.0% is
guaranteed from 20% of the
load range selected
to full load. |
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Helical Coil
Spring Testing Machine Model
CST : |
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FIE's range also
includes Helical Coil Spring
Testing Machine, Model CST
for testing coil springs
under compression loads. the
principle of operation,
details on control panel,
except deflection indicator
system, accuracy and
calibration are the same as
the laminated Spring Testing
Machine. Model ST described
alongside. The straining
unit is designed for coil
Springs. It consists of a
Hydraulic Cylinder and a
table coupled with the ram
of the hydraulic cylinder
mounted on a robust base.
The cylinder and the ram are
individually lapped to
eliminated 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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Specifications : |
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Model |
CST-6 |
CST-10 |
ST-10 |
ST-20 |
ST-50 |
| Maximum capacity
(Tone) |
6 |
10 |
10 |
10 |
50 |
| 1st Measuring
Range (Tone) |
0-6 |
0-10 |
0-10 |
0-20 |
0-50 |
| Minimum
Graduations (kgf) |
10 |
20 |
20 |
40 |
100 |
| 2nd Measuring
Range (Tone) |
0-3 |
0-5 |
0-5 |
0-10 |
0-25 |
| Minimum
Graduations (kgf) |
5 |
10 |
10 |
20 |
50 |
| 3rd Measuring
Range (Tone) |
0-18 |
01-2.5 |
01-2.5 |
0-4 |
010 |
| Minimum
Graduations (kgf) |
3 |
5 |
5 |
8 |
20 |
| Table size (mm) |
-- |
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250 x 2400 |
400 x 2400 |
460 x 2650 |
| Vertical travel
of table for
Model ST/of
Crosshead for
Model CST (mm) |
150-1250 |
150-1250 |
0-400 |
0-500 |
0-600 |
Distance between
trolleys
adjustable (mm) |
-- |
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500 - 2150 |
650 - 2150 |
850-2300 |
| Pair of
compression
plates
adjustable (mm) |
360 |
360 |
250 |
400 |
460 |
| Maximum distance
between
compression
plates (mm) |
1250 |
1250 |
400 |
650 |
750 |
| Range for
measurement of
deflection range
(mm) |
0-250 |
0-250 |
0-300 |
0-250 |
0-300 |
| Minimum
graduation of
deflection range |
0.5 |
0.5 |
0.5 |
0.5 |
0.5 |
| Ram stroke (mm) |
200 |
200 |
300 |
250 |
300 |
Straining/piston
speeds (mm/min)
(at no load) |
0-200 |
0-125 |
0-250 |
0-200 |
0-100 |
| Clearance
between columns
(mm) |
500 |
500 |
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| CONNECTED LOAD |
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| HP |
1.33 |
1.33 |
2 |
2 |
3 |
| V |
440 |
440 |
440 |
440 |
440 |
| Æ |
3 |
3 |
3 |
3 |
3 |
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Installation : |
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It is recommended that
machines be erected on a
foundation. Details on
foundation can be
given on request |
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