Hardness tester cuts ambiguity
An
Indentec Hardness Testing Machines product story
Edited by the Engineeringtalk editorial team
Aug 22, 2002
The adoption of the Rockwell test has enhanced both accuracy and scope of hardness testing for Britain's leading manufacturer of commercial grass and hedge cutting equipment.
The adoption of the Rockwell test has enhanced both accuracy and scope of hardness testing for Britain's leading manufacturer of commercial grass and hedge cutting equipment.
Ludlow based McConnel, which commands 80% of the UK market, has opted for the Rockwell method to overcome problems in reaching awkwardly located test points and achieving consistent hardness measurement with its existing Brinell tester.
Rated at 3000kgf, the Brinell machine may be suitable for high load testing of regular surfaces but its ball indenter cannot be applied to many test areas on splined hubs, drive shafts, bolt faces, cutter edges etc.
The machine's optical measurement of hardness indentations may also be interpreted differently by different operators.
The shortcomings mean that some hardnesses are impossible to establish to official standards.
A new digital Rockwell tester from Indentec has resolved the dilemma.
With its nose-mounted indenter, the microprocessor-controlled machine can easily reach test areas inaccessible to other testers, and do so without resort to special tooling.
Its software also calculates hardness automatically from the indentation and provides an unequivocal read-out of the Rockwell number on an eye level display with no requirement for human interpretation.
The benchtop machine carries out the Rockwell test on an automatic cycle, a bar graph simulating the movement of the indenter and audible signals guiding the operator through the routine.
Hardness number and Rockwell scale appear on a high contrast backlit screen.
Conversion to other hardness scales and curvature correction are automatically available.
Engineered for both Rockwell and Rockwell Superficial testing, the Indentec unit has widened the range of components and assemblies that can be hardness tested with confidence and precision at the Ludlow factory.
It joins the Brinell system in carrying out random tests to BS EN standards on a considerable variety of specimens, among them cutters, drive shafts, gears, hubs, tools, forgings, castings and incoming steel supplies.
Recent winner of a Queen's award for a new joystick-style control system for hedge cutters, McConnel sees the testing upgrade as part of a quality control improvement programme important to marketing success in the UK and overseas.
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