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method of assembly.
CBM intends to follow a similar format in future Fastener Sector
meetings.
CBM Fastener Sector visits Airbus
Report by Dr John Newnham
At a Fastener Engineering Research Association seminar held
in November, Bill Eccles, of Bolt Science Ltd, gave a
presentation on the theory and testing of vibration resistance
in nuts and bolts, and showed how the standard aerospace and
industrial tests differed. Bill is a leading fastener engineering
consultant, currently engaged in research leading to a PhD on the
subject of vibration resistance.
He presented interesting views of what caused bolts and nuts to come
loose. The most plausible theory is that vibration itself does not cause
loosening, but the transverse movement between the bearing face of
the fastener and the joint. The most common industrial and
automotive test for vibration resistance (the Junker test) applies
repeated transverse force.
The seminar continued with a presentation on two successful
products for preventing loosening by very different means. The first
was on the properties and industrial applications of the Loctite
range of products, given by Bob Orme and Colin Chapman of
Henkel Loctite. Following that, Rodney Cross of Cross
Manufacturing Co described a novel thread insert with the
Spiralock thread form, which allows bolts to be installed in a freespinning
mode, and only locks the thread when tightened. This
product has good re-usability, and has found applications in very
demanding helicopter bolting. Both Loctite and the Cross
Spiralock insert give excellent performance in the Junker Vibration
Machine.
FERA Seminar concentrates on vibration resistance
Process with sorting Automatic
sorting
Manual/visual
sorting
Forging 10 ppm 100 ppm
Stamping 10 ppm 50 ppm
Plastic injection moulding 10 ppm 50 ppm
Assembly 10 ppm 50 ppm

Table 4: Process Capabilities with manual or
automatic sorting
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