| Model RAS : |
Model RAB-1 |
Model TWIN |
Model RASM (Motorised) : |
Model RAB 250 |
| Automatic load selection with automatic zero
setting dial gauge.
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Automatic load selection & automatic zero setting dial gauge. Facility for Brinell tests with 187.5 kgf.
load with 2.5 mm Ball indicator, additional load
250 kgf. with 5mm Ball indentor for testing
hardness of non- ferrous metals
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Automatic load selection with automatic zero
setting dial gauge
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Similar to 'RAS' but motorised model.
Semiautomatic operation for production testing. Drive motor single phase 230 V 50 Cycles.
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Similar to 'RAB-1' but of bigger capacity. Diamond holder is guided in a ball cage, which enables testing of small pins having dia less than 6 mm
( up to 3 mm dia.)
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| Manual operation. |
|
Manual operation. |
|
|
|
|
Diamond holder is guided in a ball cage, which enables testing of small pins having dia. Less
than 6 mm (up to 3mm dia.)
|
|
|
Application :
VEW Electronic Universal Testing Machine is designed for testing metals and other materials under tension, compression bending, transverse and shear loads. Hardness test on metals can also be conducted.
Principal of Operation :
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.
The 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 tansducer gives the signal to the electronic display unit, corresponding to the load exerted by the main ram.simultaneously the digital electronic fitted on the straining unit gives the mechanical displacement to the electronic display unit. Both the signals are processed by the microprocessor and load & displacement is displayed.
Machine consists of :
Straining Unit
This consists of a hydraulic cylinder motor with chain and sprocket drive and a table coupled with the ram of the hydraulic cylinder, mounted on to a robust base. The cylinder and the ram are individually lapped to eliminate friction. The upper cross-head is connected to two screwed columns which are driven by a motor. Axial loading of the ram is ensured be reveling the cylinder and ram of of any possible side loading by the provision of ball seatings.
An elongation scale with a minimum graduation of 1 mm, is provided to measure the deformation of the specimen.
Tension test is conducted by gripping the test specimen between the upper and lower cross-heads, Compression, transverse, bending, shear and hardness tests are conducted between the lower cross head and the table.
The lower cross-head can be raised or lowered rapidly by operating the screwed columns thus facilitating ease of fixing of the test specimen.
Control Panel :
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.
Power Pack :
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.
Hydraulic Controls :
Hand operates 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 piston movement. Control by this valve allows extensometer readings to be taken.
Load Indicator System :
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.
Pendulum Dynamometer:
This unit permits selection of favorable hydraulic ratios producing relatively small frictional forces. Pressurized 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.
Autographic Continuous Roll Load-Elongation Recorder :
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.
Accuracy & Calibration :
All VEW Electronic Universal 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 : (Part 1) : 1991.
VEW Electronic Universal Testing Machines comply with Grade "A" of BS : 1610 : Part 1:1992 and class 1 of IS 1828 : (Part1) : 1991 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.
Special Accessories :
These include load stabilizer, Brinell test Attachment, Bend Test Attachment, Shear Test Attachment and a wide range accessories offered on request at additional cost.
Installation :
It is recommended that machines be erected on a foundation. Details on foundation can be given on request
