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The NDT Technologies Computer Based Hole Analyzer provides the user with the capability to not only inspect holes or studs for the presence and condition of threads, but also automatically perform statistical analysis on the acquired eddy current data and make that data available in several formats. Since eddy current inspection simultaneously detects part geometry, as well as base material chemistry and hardness, by analyzing the data extracted from the part during the thread inspection, much information related to both the machining process, as well as the base materials characteristics, can be discerned. The CAP-1000 Hole Analyzer not only acquires this data but also stores it in a database for SPC or trend analysis purposes and makes it available to other systems via an Ethernet connection.

The eddy current inspection of part features, like threads, is a comparison method of inspection where the eddy current signature of a master part is learned by the system and then compared to the signatures of the parts that are being tested. If these signatures match within preset limits, the parts are judged good and pass the inspection, otherwise they fail.

Eddy current inspection is a comparison method for sorting parts. If any eddy current system is going to have the capability to optimally sort parts, a good part master must be chosen to represent the average of the good part population. Further, the reject limits must be set at the +/- three sigma limits that correspond to the eddy current variations of the good part population. Locating this "average" part and setting the reject limits at the +/- three sigma value is relatively simple if there is only one hole or feature in the part that is being inspected. As the number of holes or features increase, however, the task of locating the one master part with all "average" holes becomes exceedingly difficult. The CAP-1000 series system simplifies this mastering process by automatically calculating the "average" signature for the ideal good part as the parts are tested. It then corrects the learned value and sets the +/- three sigma reject limits where they must be to optimize the sort.

The CAP-1000 Hole Analyzer includes the following operational screens:

• A Part Status Screen that shows a CAD view of the part being tested and displays the eddy current signature associated with each inspected feature. This screen also indicates the pass or fail condition of each inspection by illuminating the respective feature display either green or red. This part status screen also includes a toolbar that provides access to the other system screens and displays the "average" and the +/- three sigma values calculated from the good part population.
• A Statistics Screen that shows a graph of the actual good part bell curve and the location of the rejected parts with respect to the good part population. This screen also includes a toolbar that provides access to the other screens as well as displays the following: *Total Parts Inspected per Run *Good Part Population Average *Total Good Parts per Run *+/- Three Sigma Settings *Total Bad Parts per Run *Inspection Date and Time *Part Number *Parts Inspected per Hour *Total Rejects in the Last Hour
• A Set-Up Screen that allows the user to view and change the following information: *Run Date *Total System Inspection Time *Part Number *+/- Three Sigma Limits *Good Part Population Average *Other Part Identifier *Automatic or manual input of good part average and +/- three sigma limits into the sort equation
• A System Status Screen that continually indicates the operational status of the probes, the cabling, the system power supplies, the system oscillator, and all the electrical components in the probe drive circuitry.
• A Troubleshooting Screen that assists the user in solving operational and set-up problems.
• A Date View/Transfer Screen that allows the user to view the information stored in the inspection system database by part number, date code, or other part identifiers and assists the user in transferring data to other mediums via an Ethernet port.
• A PLC I/O Screen that displays the status of all outputs within the system that communicate part pass/fail status and probe operational status to the users PLC via the Harting Connector.