Automated Rivet Interference

The Automated Rivet Interference Inspection System (ARIIS) was developed to replace the traditional time-consuming, operator-dependant methods of measuring rivet interference by hand for machines that install fluid-tight, fatigue-rated rivets. ARIIS measures the diameter of installed rivets and open holes in test coupons to determine whether rivet installation processes are producing interference levels in compliance with design specifications. The ARIIS method utilizes Capacitance Measurement Systems, a Laser micrometer and a precision stepper motor/bench center that are integrated with a PC. Studies show a reduction in measurements variation by a factor of four to five when comparing the ARIIS system to traditional blade micrometer hand methods.

The ARIIS system also provides built-in Statistical Process Control (SPC). This is accomplished by automatically keeping records on each inspected fastener. The system, on command, will generate X-bar and R charts, as well as other SPC data on rivet button height, button width, and all interference characteristics over time. Also, all pertinent tooling, structure, materials, and aircraft information is automatically recorded for tracking. The system has been used to track rivet installation machine performance over time by recording rivet installation trends.

The ARIIS system was developed by the Boeing Company and is manufactured under license by Measurement Systems Inc.

Measurement Systems Incorporated, 2152 Northwest Parkway, Suite B, Marietta, GA 30067. Tel: 770-951-0878; Fax: 770-951-8920.