Flatness measurement with multi-dimension control units and LVDT linear transducers

digicheck measures flatness with lvdt probes and multi-dimension electronic controller

Flatness measurement is a method used for measure flatness of a surface or a piece.

It is an important part of many industrial processes and can be done with different techniques. One of the most common methods for measuring flatness is theuse of LVDT probes and linear transducers. This method has become increasingly popular due to its high accuracy and reliability.

For measurements obtained from LVDT probes and linear transducers, amulti-dimension control unit, to ensure uniformity across multiple parts or surfaces to be measured. This control unit uses multiple sensors placed on the surface to be measured, obtaining readings from each sensor at different points on the surface. The acquired data is then compared with predetermined values, which allow to obtain accurate measurements with minimal variations between the various measurement points.


  • Use of linear LVDT transducers with centesimal or millesimal precision that are easy to install and easy to find.
  • Intuitive and easy to use interface.
  • Quick and precise measurements on any surface and on any detail even by unqualified personnel.
  • Compact design of the device facilitates its installation on existing machinery without requiring additional space or modifications to production lines.
  • Programmable parameters that allow users to adjust measurement ranges and accuracy based on specific requirements and application scenarios.
  • Interfacing with management environments (SQL, AS400, Oracle) for integration into a logistics environment and for compliance with Industry 4.0

Products used

LVDT probes for measurements and dimensional checks on contact

RLT-100 series LVDT transducers

  • Measuring range +/- 1 mm
  • Total mechanical stroke of the rod measuring 4,3 mm
  • Measuring force selectable between 0.63 N and 4 N
  • Fixing stem Ø 8 mm with the possibility of clamping along its entire length
  • IP65 protection
  • Mechanical dipstick movement with spring preload

Technical insights

The measurements obtained with this technique are then sent to a computer where they can be analyzed and interpreted. The value obtained from the multi-dimension control unit can be used to calculate a flatness value based on the interpolated plane technique. This technique uses a mathematical formula to determine the interpolated value of all measured points on the surface, giving an overall flatness value for that particular area or part.

Another advantage this technique offers is the ability to detect small variations in flatness that other techniques may not detect, such as deformations or depressions of the surface to be measured. By using sensors placed at various points on the part or surface, these problems can be identified quickly and accurately, without having to manually inspect each individual feature or area.

The main advantage of using this technique for flatness measurement is its accuracy and reliability compared to other methods available today. It provides readings that are highly accurate and more reliable than those taken manually, allowing you to more quickly identify potential problems caused by warped surfaces or parts that need to be corrected before proceeding to further machining. It also allows for more consistent measurements across multiple units or pieces, ensuring that quality assurance standards are met with minimal variation between items tested and evaluated using this method.

In conclusion, flatness measurement with LVDT probes and linear transducers has several advantages over other methods available today. Between these, faster acquisition times due to automated processes, increased accuracy due to multiple sensors positioned at various points on the surface to be measured, greater consistency between multiple pieces or units tested, and better detection capabilities than manual inspection techniques. It also allows you to make calculations using an interpolated plane technique that provides a reliable estimate of overall flatness without requiring a manual inspection every time a product needs to be evaluated

MODULCHECK systems lend themselves to measurements directly on the production line e also managed by unqualified personnel. The visualization interface has been deliberately made simple and easy to consult but without renouncing the powerful mathematical functions intended for the analysis of dimensional and geometric characteristics. 

All production data is stored in a local database with the possibility of transfer or synchronization with existing databases ( SQL , XML or CSV ) for a complete and reliable data analysis in real time.

Leave a comment

Your email address will not be published. Required fields are marked *