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head and a short distance into the stem (or pin) of the aircraft fastener. During cutting,
a closed loop de-ionized water system is used as a Dielectric Fluid and circulated
throughout the head of the device, in such a manner that the fastener and surrounding
airframe do not heat up and are cold to the touch immediately after cutting.
The depth of cutting is controlled automatically, such that a thin wall remains holding
the fastener head in place. The fastener head may then easily be severed by a sharp
tap with a hammer and hand punch. When the device is positioned correctly the
airframe is not damaged in any way, and the temperature rise in the airframe around
the hole is insignificant. Due to the depth of the cut, the fastener stem has no remnant
burr which may damage the hole in the airframe as the stem is driven out.
The photograph below shows a severed fastener with the groove and the fractured
thin wall. Note that the cut is concentric with the stem; the wall thickness is uniform
around the pin, the cut ends just below the head, and the fastener stem is burr free.
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