Mr. Eisenberg. Well——
Mr. Frazier. With reference to copper or other softer metals—it is a steel. I could not say how hard it actually is.
Mr. Eisenberg. What will the effect of the metal used in the bolt face be upon the tool which is used to finish it off, cut it and finish it off?
Mr. Frazier. The tool will gradually wear out.
Mr. Eisenberg. Well, will the tool leave different marks on the end of the bolt face from one bolt to the very next bolt face?
Mr. Frazier. Oh, yes; that very often happens. The tool is worn out or the small cuttings get underneath the edge, between the tool, and nick the edge of the tool, so that the tool will gradually change over a period of time. The cutting edge—the amount of change depends upon the amount of wear, the heat involved, and the hardness of the metal—the relative hardness of the metal.
Mr. Eisenberg. Will that particular change be noticed invariably in two consecutive bolt faces?
Mr. Frazier. No, sir.
Mr. Eisenberg. So what is the genesis of the difference in the two consecutive bolt faces as they come from the manufacturer?
Mr. Frazier. The change, as I said, depends on the bolt you are using. It does not always take place, because some bolts are made of a very soft metal, and they will not necessarily change a machining tool to that extent.