valtsi ja tooriku vahelisele haardekaarele vastav maksimaalne nurk valtsimisprotsessi käivitumiseks (vt haardekaar; vrd kontaktnurk)
the maximum angle that can be attained between roll radius at the first contact and the line of roll centres (see: arc of bite; compare: angle of contact)
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In rolling of metals, the location where all of the force is transmitted through the rolls.
