CMU30 and CMU 80 cross-section measuring devices

To determine the load-bearing capacity of a specific material, a rigid specimen made of metal, plastic, composites, or other material is used and subjected to a tensile or flexure test. Precise measurement of the cross-section is required to determine the tensile or flexural stress.

CMU30 ve CMU80 manuel kesit ölçüm cihazları

ZwickRoell offers cross-section measuring devices for determining the specimen thickness and width with precision. The heart of the device is a closed frame with four incremental measuring transducers mounted on it. The specimen thickness and width are measured differentially by each pair of transducers.

The values from the sensors are recorded by an electronics unit, while a programmable logic controller (PLC) takes care of control and data link functions. Each centering ring in the width and thickness direction ensures correct alignment and a secure specimen position during measurement. Operation is via a color touch panel, from which the measured values can be read. The basic settings of the unit can also be configured here.

Key Advantages and Features

Advantages and features

Advantages

  • High-accuracy cross-section measurement, highly resistant to temperature influences due to use of a differential measuring-system with 4 high-resolution measuring-transducers mounted on an enclosed frame.
  • Operator influence largely eliminated (e.g. via centering units in width and thickness orientations) for high test-result repeatability.
  • Cross-section measuring unit can be used as a central dimension-measuring station in conjunction with CMUshare software. Assignment of data to correct specimen ensured by use of labeling (e.g. via barcode or felt pen).

Sequence

After the unit has been switched on it is adjusted by measurement of a reference dimension (adjustment can be repeated periodically if required) andt is so ready to begin measuring.

CMU30:

For specimen measurement the 'width' centering unit is opened, the specimen inserted and the centering unit closed by releasing the opening lever.

A button is then pressed on the display (or in testXpert Testing Software) and the measuring sequence is performed automatically as follows. The 'thickness' centering unit closes, the measuring transducers are applied, then withdrawn once measurement is complete. The measured value is then displayed and transmitted elsewhere if required. If multiple measurements have been selected, the specimen is repositioned by the operator and a new measurement cycle is started. When the pre-selected number of measurements is reached, the average value or minimum value (as desired) is determined and transferred if required.

CMU80:

The CMU80 is equipped with automatic clamping, width-centering and measurement-frame positioning. Following insertion of the specimen the measurement sequence is fully automatic for both single and triple measurement.

Connections

The cross-section measuring units communicate via a serial port. In the basic version, values are transmitted directly to the specimen data for the specimen selected in testXpert Testing Software. The optionally available 'CMUshare' software enables the cross-section measuring units to be used as a central measuring station for multiple network-connected testing machines. CMUshare also supports the use of barcodes for specimen identification.

Measurement Range and Accuracy of Cross-Section Measuring Device

Measuring range CMU 30

Description

Value

Description

CMU30

Measurement range/Accuracy

Measurement range, thickness

0.2 ... 30

mm

Measurement range width

6 ... 40

mm

Resolution

< 0.01

µm

Repeatability[1]

±1

µm

Weight

37

kg

  1. at a gage block

Measuring range CMU 80

Description

Value

Description

CMU80

Measurement range/Accuracy

Measurement range, thickness

5 ... 80

mm

Measurement range width

10 ... 60

mm

Resolution

< 0.01

µm

Repeatability[1]

±2

µm

Weight

97

kg

  1. at a gage block

Specimen dimensions CMU 30

Description

Value

Description

CMU30

Specimens

Shape

Flat specimens

Thickness, max.

30

mm

Width, max.

40

mm

Parallel length, min.

60

mm

Overall length, min.

100

mm

Specimen dimensions CMU 80

Description

Value

Description

CMU80

Specimens

Shape

Round and flat specimens

Thickness, max.

80

mm

Width, max.

70

mm

Parallel length, min.

60

mm

Overall length, min.

320

mm

Reliable Test Results

  • Accurate
  • Repeatable
  • Reproducible
  • Traceable

Our cross-section measuring devices deliver reliable test results.

Accuracy

Every two measuring transducers for thickness and width, which follow a differential method, provide correct and accurate measured values.

Repeatability

Periodic comparative measurements with a strain-gaged alignment transducer guaranteed repeatable results.

Reproducibility

Centering and an automatic measurement sequence ensure repeatable results without operator influence.

Traceability

Together with the CMUshare software, specimens can be identified by their barcodes/2D codes and results are assigned without the risk of errors.
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