TASS Verification System

Structure of the TASS Element

• The TASS element's base body is securely clamped in the test device using form-fit or force-fit methods
• The internal torsion shaft provides a precise torque/rotation angle curve within a 12° torsion range. Each element includes a calibration certificate detailing measuring points M1 & M2, rotation angle range W3, & linearity deviation LA.
• Hirth toothing to facilitate part exchanges
• Four sizes support torque ranges of 1 to 260 Nm
• The exchange part couples to the tightening system, with blanks adaptable to specific nutrunner geometries

Test Arrangement

• The tightening system remains in its production environment during testing
• Custom Test Programme: A special test programme is created & executed in the control system
• During testing, the nutrunner performs a fitting with a specific rotation angle & low tightening velocity, recording process data
• A comparison with the nominal curve of the torsion element determines if the system measurement is OK or NOK

Test Procedure

• The torque increase up to point M1 results from overcoming the preload in the torsion shaft
• After reaching M1, the torsion shaft is rotated between the two stop surfaces on the TASS element, covering a 12° range (W3) with a linear torque increase
• At point M2, the torsion shaft contacts the second stop surface, causing the TASS housing to twist, resulting in a steeper torque curve
• The test is completed at a M3 torque significantly above M2
• The measurement results at M1 & M2, along with a customisable envelope curve around the nominal curve, determine if the test is OK

Software

Exchange Parts

Exchange Part Blanks

TASS Element