Thread Inspection System for Reverse Angle Buttress Threads

Johnson Gage has developed a thread inspection system for the verification and in-process control of reverse-angle buttress threads commonly used in anti-splaying medical devices such as orthopedic implants. Available for either external or internal thread forms, the system is based on advances in grinding and manufacturing technologies.

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Johnson Gage has developed a thread inspection system for the verification and in-process control of reverse-angle buttress threads commonly used in anti-splaying medical devices such as orthopedic implants. Available for either external or internal thread forms, the system is based on advances in grinding and manufacturing technologies. Similar in design to current products from the company used for medical applications such as bone screws and dental implants, the system is suitable for both inspection and manufacturing environments. Aside from the thread contacting segments and setting ring used for verification and traceability, the system uses components that are adaptable for various other thread inspection applications. Initial field studies exceeded all expectations regarding both accuracy and repeatability/reproducibilty. Gage repeatability and reproducibilty as measured by standard industry protocol was less than 5 percent. Common applications include design validation; dimensional inspection and conformance; initial manufacturing and tool verification; and in-process determination of capability degradation.