JSS Method Inspects Rotary Shoulder Connector

Bowers Metrology has launched Gagemaker's Joint Strength System (JSS), which delivers high-accuracy rotary shouldered connection thread inspection for oil industry applications. Universally, pitch diameter is used as the 'control' diameter for the design of each connector. If a connector's pitch diameter is machined incorrectly, the quality of the connector is jeopardised. The commonly used ring or plug stand-off gauges, which are utilised for this inspection task, are unable to directly detect variations in the component's pitch diameter.

Historically, pitch diameter has remained a connector feature that has been left to interpretation by the perceived 'fit' of a ring or plug gauge. At best, the ring or plug would identify a discrepancy in either lead, taper or thread form. Although any one of these features could render a connector unusable, the manufacturing operator is not able to identify which element is responsible for the problem. Gagemaker's advanced JSS method accurately gauges the quality of a rotary shouldered connector.

According to Bowers, the cost-effective JSS adds the most important measurement element - pitch diameter - to the criteria currently used to accept or reject a connector's quality. JSS provides a simple method that enables total control over all of the components contained in a connector assembly. The system combines some of the company's existing gauges with new products, while the new TDWIN Taper software enables the selection, calculation, setting and reporting of the measured sizes of the components.

JSS is able to check thread cone taper, thread lead, thread height, thread form and pitch diameter at the pitch plane. Following the machining of all of these features, within the allowable tolerances, the offending element can be identified. By using the basic JSS gauge package, manufacturers will now be able to inspect any right-hand or left-hand rotary shouldered connector, either with or without the use of ring or plug gauges.

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