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Roger Zeoli is manager of bench & machine gages at Marposs Corp. (Auburn Hills, MI). For more information, call (248) 370-0404, email marposs@us.marposs.com or visit www.marposs.com.
Pick up any shaft or threaded fastener. How are you going to check it? An outside micrometer is most often the go-to tool for measuring diameters. A height gage or drop indicator could be used to check dimensions between part features, while an optical comparator is a good way to inspect thread forms or measure a groove width.
There was a time when choosing a gaging solution for shaft-type parts was a relatively straightforward task. High-volume parts received a custom-built gage and everything else received a manual or automatic “snap-on” or ring gage of some sort.