clapper box

noun

Definition of clapper box

: a hinged part on the toolhead of a reciprocating machine (as a planer or shaper) that permits the tool to clear the workpiece on the return stroke

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“Clapper box.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/clapper%20box. Accessed 28 Oct. 2020.

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