The YETC-700A is a transducerized tightening controller designed for Yokota's TKa Series impulse wrenches with integrated angle sensors. It supports two tools operating simultaneously from a single controller, each with 20 independent work groups that define target torque, angle window, and fastener count. The 7-inch touchscreen MMI displays real-time torque and angle data during each tightening cycle, and the controller records up to 100,000 tightening results—including 50 waveform traces and 50 dynamic torque curves—for full process traceability. Automated bolt group switching advances to the next tightening sequence without operator input, triggered by external signals from a socket change box or fixture sensor.

How does angle monitoring improve tightening quality?

Unlike mechanical shut-off clutch tools that stop at a preset torque threshold, the YETC-700A monitors both torque and rotation angle during each tightening cycle. The transducer built into the TKa Series wrench measures dynamic torque in real time, while the angle sensor counts spindle rotations from the start of the pulse. The controller compares the torque-at-angle curve against a learned reference signature for each joint. If the fastener bottoms out prematurely—indicating a cross-threaded or bottomed-out bolt—or if the angle at final torque falls outside the specified window, the controller flags the tightening as non-conforming. This dual-parameter verification catches assembly defects that a torque-only system would miss, such as missing washers, deformed threads, or joint relaxation.

How does Poka-Yoke integration work on the production line?

The YETC-700A includes a 10-input, 10-output I/O terminal block for integration into error-proofed assembly cells. Inputs can receive signals from socket spanner change boxes, fixture clamp sensors, and part-presence detectors; outputs can drive stack lights, reject station diverters, and line-stop relays. In a typical Poka-Yoke workflow: the controller verifies the correct socket is installed, enables the tool only when the fixture confirms part presence, monitors the tightening result against the work group limits, and routes the assembly to a reject lane if any parameter fails. This implements the three-zone quality philosophy—accept zero faults from upstream, produce zero faults at station, pass zero faults downstream—without a separate PLC for basic interlocking logic.