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Alignment Fixtures

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Test load
  • 5 kN - 250 kN

Alignment fixture for axial offset and angle correction

Precise axial alignment of the testing system test axis is a basic requirement for achieving reliable test results. Alignment must be performed with great care and precision, particularly when testing brittle materials such as glass,
fiber composites, or certain metals.

 

Advantages & features

Advantages & features

Alignment fixture for axial offset and angle correction
Advantages of alignment fixture for axial offset and angle correction
Adjustment rod and test sleeve
Advantages of adjustment rod and test sleeve
Alignment fixture for angle correction
Alignment measurement
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Alignment fixture for axial offset and angle correction

The alignment fixture is used to accurately compensate for angular and offset errors in the test arrangement.

The alignment fixture is an alignment element and is mounted directly on the testing system’s base crosshead. The adjustment screws are used first to adjust the angular error and then the axial offset. The screw configuration for making adjustments in the X and Y direction makes it possible to correct errors in their respective working direction. The alignment can take place in the loading state.

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Advantages of alignment fixture for axial offset and angle correction

  • Reliable test results through precise alignment of the test axes
  • Accurate positioning, reproducible and play-free adaption in each axis guarantees reliable test results
  • Angle and offset errors can be set independently from each other easily and quickly
  • Secure gripping of the alignment fixture for long-term retention of any adjustments
  • Adapting to top crossheads, moving crossheads, and base crossheads enables a flexible range of application
  • At a force level of 250 kN, there is an option that includes a flange interface, which allows for shorter test arrangements and a higher degree of stiffness

Adjustment rod and test sleeve

The test axis can be aligned precisely using the adjustment rod and the test sleeve. The adjustment rod is placed on the alignment fixture and if the arrangement is correctly aligned, the test sleeve can be slid relatively smoothly between the stud on the load cell and adjustment rod.
In addition, the adjustment rod has a ground, level surface to which the probe of a dial gauge (optional) can be attached. The adjustment rod is attached to the alignment fixture and the dial gauge holder with the dial gauge is mounted to the moving crosshead for example. Using the dial gauge and both surfaces, an angle offset can be easily corrected in two planes.

Advantages of adjustment rod and test sleeve

  • Short set-up time and significant reduction in time and effort required for adjustment
  • Accurate checking of the offset due to the 100 mm test length of the adjustment rod
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Alignment fixture for angle correction

The alignment fixture for angle correction makes it possible to correct an angular error in the test arrangement.

The alignment fixture is mounted underneath the testing system's moving crosshead. The load cell is mounted to the alignment fixture. Usually, the angle alignment fixture is used in conjunction with the alignment fixture for axial offset and angle correction to correct an angular error for the moving crosshead. The alignment fixture for axial offset and angle correction is mounted on the base or the base crosshead.

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Alignment measurement

Precise guidelines regarding maximum permissible transverse loads are established in the respective application standards.

To verify machine accuracy, adjustment must take place in a loaded state using optionally available strain-gauged alignment specimens, measurement amplifiers, and ZwickRoell testXpert III testing software. The calculation routines comply with ASTM E1012.

Purely mechanical adjustment in an unloaded state can be performed via the mounting studs or via a divided specimen clamped in the specimen grips.

Technical overview

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  • Product information: Alignment fixtures for zwickiLine and AllroundLine PDF 2 MB
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