Multiple station machines often combine upsetting and extruding operations to form large-head, small-shank parts. The reason is that upsets can involve 6 to 10 diameters, rather than the 4.5 diameters maximum. Upsetting and extruding, however, are separate operations, so maximum deformation of a blank must be figured separately for upsetting and extruding limits even with multi-station headers.
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