Nibbler

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A nibbler, or nibblers,^[1] is a tool for cutting sheet metal with minimal distortion. They may be used for nibbling. One type 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 6 mm (0.24 in) wide. Another type operates similar to tin snips, but shears the sheet along two parallel tracks 3–6 mm (0.12–0.24 in) 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

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