We run 20 Star Swiss machines and we are constantly battling our bar stock suppliers for better quality. We typically have good luck on 5/16" and up, but on jobs that require say 1/4" Hex 303ss we end up with bars that are bent enough to cause problems. We developed an inspection process which rejects bars that we know will cause alarms, but the suppliers all say we are 'too picky' and that they can sell it to any of their other customers. Our spec is not nearly as stringent as what the bar feeder specifications call for either.
This is a thread to make suggestions and to share supplier quailty stories/opinions.