The Importance of Alignment Measurement

Rising quality requirements have caused the traceability of the geometrical alignment of materials testing machines to increase in importance. Precise alignment prevents the risk of false measurements.

Zwick offers alignment as well as measurement and recording the alignment of your materials testing machines.

Alignment-Messung

Verifying Test Axis Alignment as per Nadcap

Nadcap stands for "National Aerospace and Defense Contractors Accreditation Program" and was originally a global accreditation program for suppliers to the aerospace and defense industries. Nadcap's goal is to generate economical approaches to special processes and products and promote continual improvement within accredited companies.

In contrast to certification of quality management systems as per ISO 9001 and EN 9100, Nadcap accreditation includes both detailed examination of special technical processes and an audit with regard to the observance of defined specifications and guidelines. Aerospace industry manufacturers and suppliers in particular define extremely demanding requirements for the technical and staff qualifications of testing laboratories. These requirements are specified in standards, directives, and audit criteria, and are checked through Nadcap audits allowing maximum process stability to be attained and standardization of quality guaranteed.

Alignment measurement is a component of Nadcap accreditation and is based on ASTM E1012, which stipulates compliance with defined tolerances.This is reflected in Nadcap-defined audit criteria AC 7101 and AC 7122, which define the conditions for the measuring procedure, that is the verification of test axis alignment.In addition to aerospace manufacturers and service providers, an increasing number of companies in other sectors are affected by alignment measurement as part of Nadcap accreditation requirements, for example in the mechanical and plant engineering industry and in the metals industry.

Alignment Measurement to ASTM E1012

Bending stresses resulting from misalignment between the applied force and the specimen axis during the application of tensile and compressive forces can cause erroneous test results. To ensure your testing complies with test methods that limit the permissible amount of misalignment, were commend periodic alignment verification. 

Zwick Services and Support is proud to be accredited by A2LA for alignment services for both Zwick testing systems and systems produced by most other manufacturers. These services are performed in accordance with ASTM E1012, Standard Practice for Verification of Testing Frame and Specimen Alignment Under Tensile and Compressive Axial Force Application.

Alignment Nadcap

Our Services

Based on ASTM E1012, strain-gaged alignment transducers, which preferably conform to the geometry of the specimen to be tested at a later time, are required. An experienced Zwick service technician positions the strain-gaged alignment transducer in the test axis of your testing system and it is then loaded in the elastic range.

In the event of non-uniform force application to the specimen, the applied strain gages will register different strains. These are digitalized through a connected electrical measurement amplifier and transferred to a special testXpert II software test program. Material properties are determined and logged in testXpert II according to standard specifications and specimen geometries. A simple, structured evaluation in testXpert II enables a Zwick service technician to identify errors in the test axis on the basis of characteristic measurement results. If necessary, measures can be taken using components specifically developed for alignments to resolve alignment errors. In addition, testXpert II provides adjustment recommendations for the alignment unit option, allowing detected alignment to be corrected easily and conveniently.

Our standardized strain-gaged alignment transducer works with a large percentage of the materials testing machines to be tested. Furthermore, defined geometry data can be used with strain-gaged alignment transducer according to your specific requirements.

Zwick standardized strain-gaged alignment transducers for alignment measurements fulfill Nadcap and ASTM E1012 requirements. Read more about Zwick strain-gaged alignment transducers...

Alignment Measurement

Standard

ASTM E1012

ASTM E1012

ASTM E1012

ASTM E1012

Method

Nadcap AC 7101 For metals Nadcap AC 7101 Metals Nadcap AC 7101 Metals Nadcap AC 7122 Composites

Design

Round strain-gaged alignment transducer

Round strain-gaged alignment transducer

Round strain-gaged alignment transducer

Flat strain-gaged alignment transducer

Nominal force of the machine

Max. 50 kN

Max. 100 kN

Max. 250 kN

All

Application

12 times

12 times

12 times

12 times

Number of measuring planes

3

3

3

3

Strain gages per plane

4

4

4

4

Fmax of the strain-gaged alignment transducer

20 kN

40 kN

100 kN

17.5 kN

Standard measuring points

10%/20%/40% Fmax - 5 kN/10 kN/20 kN 10%/20%/40% Fmax - 10 kN/20 kN/40 kN 10%/20%/40% Fmax - 25 kN/50 kN/100 kN 1,000 μm/m  Determined strain approx. 17.5 kN

Protective elements

Necessity depends on grips used Necessity depends on grips used Necessity depends on grips used

Required

Gripping dimensions without protective elements

L: 262 mm M16 thread L: 262 mm M16 thread L: 398 mm M24 thread

Gripping dimensions with protective elements

L: 334 mm Ø 28 mm L: 334 mm Ø 28 mm L: 443 mm Ø 35 mm L: 254 mm B: 10.2 mm
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Zwick Offers Maximum Benefits for Alignment Measurement

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