Extra pot broaches refer to the type of broaching which is used when an external form is required. The form can be splines (straight sided, involute, angular), cam, or lobular.
In a pot broaching set up, the part is usually pushed up through an internal 'pot'; a fixture that houses a series of form inserts.
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Broaching (Broaching is a machining process that pushes or ...)

Alternative Spellings (Synonyms): Extras, Pots
Extraneous ash refers to ash in coal that is derived from inorganic material introduced during formation of the seam, such as sedimentary particles, or filling cracks in the coal, also called sedimentary ash.
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