Finish-grinding of the hubs and shafts for J57and J75 jet engines. - There are 66 different parts and range in value up to $1,000. All tolerances are extremely close on finished parts. In making light finish grinds,the machine operator periodically stops the grinder to check the part with a bar-type gauge, pre-set on a master gauge. An excessively high number of hubs and shafts, about 25%, which had passed the machine operator's control gauging were rejected in the final inspection. Some of the rejected parts were under-size and had to be plated, while oversize parts had to be reground.

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