Nibbler
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A nibbler (or pair of nibblers<ref>Template:Cite book</ref>) is a tool for cutting sheet metal with minimal distortion. It may be used for "nibbling": cutting a contour by producing a series of overlapping slits or notches.
One type of nibbler operates much like a punch and die, with a blade that moves in a linear fashion against a fixed die, removing small bits of metal and leaving a kerf approximately Template:Convert wide. Another type operates similar to tin snips, but shears the sheet along two parallel tracks Template:Convert apart, rolling up the waste in a tight spiral as it cuts.
Nibblers may be manual (hand operated) or powered. Power nibblers are often powered by compressed air, though electrical types also exist. A common DIY nibbler tool is an electric drill attachment, which converts the rotary motion of the drill into a reciprocating motion of the jaw.
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Detail of cutting bit of manual nibbler, punch-and-die type
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Shear-type nibbler and detail of cutting head
References
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