INSPECTING THREADS


Bobby Kirkwood, application engineer for Mitutoyo (Aurora, IL). “It is a go/no-go check and it is the most common practice in industry.” Moving beyond a simple go/no-go check would include using dial indicators set into conve-


nient holders. Dial indicators measure pitch diameters, pitch (the distance between threads), as well as taper and thread height. Strong connections require precisely matched parameters to ensure a snug fit in critical applications, like piping connections used in the oil & gas industry. To define the tolerances in these


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measurements, Kirkwood said that it is common practice in the oil & gas industry to refer to a Golden Part, a First Article Inspection piece that was precisely manufactured and measured with standard metrology devices. Shop personnel will zero indicators on the Golden Part, and then measure variations to it on production parts to ensure they stay within tolerances. “It acts like a transfer gage,” said Kirk- wood. Mitutoyo also offers thread and ball-point micrometers for measur- ing pitch diameters, for use to a print against a Golden Part. Pitch diameter is a significant measurement because it often determines the quality of the mating and connection. Companies like Gagemaker (Houston, TX), a reseller of equipment from Mitutoyo, offer com- plete kits of gages and special-purpose dial indicators for industries like oil and gas, mining, and water wells.


High Accuracy, High Tech Hand-held devices introduce the variable of operator consistency. Kirk- wood notes two devices from Mitutoyo that capture measurements with far less operator variability—Three Wire Thread and Contracer measurements. The common 3-wire measuring system puts wires of known thickness into the screw threads, so that a micrometer measures the wires that protrude. This displacement method is far more ac- curate and consistent. It can be used to calibrate gages or used directly in measuring production parts, according


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