The ThreadChecker System consists of a single electronics module compatible with any probe/material combination. Designed specifically for in-die use, it provides rugged, reliable verification of thread presence or absence in nearly any electrically conductive material. With its proven eddy current technology at its core, threads can be checked regardless of part cleanliness, reducing the cost of implementation. Principles of Operation
As an eddy current sensor, the system (probe plus electronics) detects the distance between the probe OD and the ID of the hole. In untapped holes, this indicates tap drill diameter. In tapped holes, this indicates pitch diameter of the threads.
The most popular implementation is to use the switched output wired to a PLC or other controller, programmed to alarm when no thread is detected. This alarm may stop the operation or may divert untapped parts from further processing. Alternatively, the analog voltage may be monitored. In this case, the user would program the PLC or other control device with whatever limits are suitable for the application. Outputs / Indicators
The switched output is an opto-coupled NPN solid-state relay. It comes standard in window comparator mode, but can be set up in level comparator mode, and the polarity can also be changed. The analog output is set so that there is always a 5 VDC difference between a threaded and unthreaded hole. A 3-color power LED and a thread LED are used to indicate a variety of conditions related to the presence/absence of threads, and the health of the sensor system itself.
More Features
- Universal electronics for any probe/material combination
- Four internal probes from 4 mm to 10 mm
- Two external probes: 6 mm and 8 mm
- DIN rail mounting option
- CE compliant
- IP-67 rated probes and electronics
- PUR jacketed probe and I/O cables
- Go/no-go LED indicator
- Push button teach
- Both switched and analog outputs
-606x1000.png "Dimensions of ThreadChecker")
