The structure of the turning-broaching machine only permits the process force to be measured at the base on the revolver drive unit. Artis GmbH had the idea to install a measuring washer under an existing screw connection.
This resulted in a challenge:
- The screw connection needed to be tightened with the nominal pre-stress force to DIN 18800
- while relatively small process forces had to be reliably recorded at this high pre-stress force.
In practice, these are for example 110,000 N pre-stress with a standardized tightening torque of an M16 screw, quality 12.9, and machining forces of 500 – 1000 N.