are to be centrifuged to extract the lubricating oil thereon there are numerous rod ends tool bits workpieces and scrap pieces of metal the phrase 34 rod ends 34 is a term of art meaning the end of elongated metal rods which the machine operator simply tosses into the collection of metal chips at the end of the rod being machined in addition the machine operator may want to dispose of scrap wherein machining mistakes have been made on workpieces as a result rather large pieces of metal can be found in a collection of metal shavings an engagement by the blades 54 with the rod ends tool bits workpieces and scrap pieces of metal or the like will cause a substantial jolt or shock to be applied to the blades 54 while the central bolt 20 received in the central hole 61 effectively urges the plate 59 into tight frictional engagement with the bottom wall 22 of the separator bowl so that the plate 59 and blades 54 will be effectively moved with the separator bowl 13 the shock applied to the blades 54 by these large objects will be sufficient to incrementally move or index the plate 59 relative to the separator bowl 13 as a result the leading surface of each of the blades adjacent the radially outermost portion thereof becomes located adjacent an unworn segment of the internal wall surface of the separator bowl as a result wear to the internal wall surface of the separator bowl is substantially minimized by the foregoing structure on.