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In order to ensure the quality of screw connections in assembly processes, the tools responsible must undergo regular tests and calibration procedures. Usually these services, in the form of calibrations, must be carried out by the manufacturer of the screwdriving equipment in their own laboratories.

If it is not possible to do without equipment for the few days it will take to send it away for calibration in an external laboratory the answer is: on-site calibration! DEPRAG SCHULZ GMBH u. CO. in Amberg, Germany offers this service feature. In interview with Tobias Dirrigl, Application Technician for EC Screwdriving Technology, the benefits to customers of mobile calibrations are explained in detail:


Question: Danger to life and limb – an expression which is frequently associated with quality for assembly production. What role does calibration play?

Dirrigl: The quality of screw assemblies is influenced by the precision of the screwdriving or measurement equipment used. It is only with accurately functioning tools that production problems and any resulting claims for damages can be avoided. There are around twelve kilograms of screws built into a mid-range car. 15 percent of these are subject to the safety category “danger to life and limb”. Function and stability are crucial in these components! If one of these fails, a resulting accident may cost human lives. It is not without reason that DIN EN ISO 9001 prescribes the regular testing and calibration of measurement equipment which is responsible for the evaluation and documentation of screwdriving results. Many customers do not take into consideration that: the guided screwdriving tool is a piece of measurement equipment and is therefore also subject to the directives of quality standards.

Question: As the term mobile calibration indicates, calibrations are not carried out in the manufacturer’s facilities but directly at the customer’s site. How is the service carried out and what are the main benefits?

Dirrigl: Mobile calibration can be carried out by DEPRAG technicians at the customer’s site. We have a calibration station with measurement equipment which is mobile and manoeuvrable so that production processes are not disturbed. The devices are calibrated in accordance with DIN EN ISO 9001 in the same way as manufacturer calibrations which take place in accredited calibration laboratories. The only difference is that calibration takes place whilst production is ongoing. This guarantees optimal reliability in quality during screw assembly.