WHITE PAPER EZ-TORQ III TORQUE ANALYZER
3 Using a rotary torque sensor: These sensors are ideal for dynamic torque measurement application. The sensor plugs into a torque tester or torque analyzer. The rotary torque sensor is the ideal torque- auditing tool for testing the actual torque being applied on the assembly application. It’s an instrument that quickly attaches to a power tool’s drive, without interfering with the tool’s ability to fasten a screw or bolt. As the tool’s operator, whether human or robotic, tightens the fastener, the rotary torque sensor detects how much torque is applied until the tool shuts off and torque is applied to the fastener. Rotary torque sensors measure torque under actual joint conditions, returning the most accurate results possible. There are many brands in the market to select from, and some rotary torque sensors are more sophisticated than others. To select the proper rotary torque sensor, consider the needs of your power tool, quality of the
measurement equipment, the features of the sensor, safety certifications, and, most importantly, ISO 17025 Standards. The rotary torque sensor has a rated torque range capacity. The power tool’s torque capacity must fall in between the torque range capacity of the torque sensor. Mountz recommends the power tool’s maximum torque capacity fall in between 20% to 80% capacity of the torque sensor.
How to measure power tool torque output with a rotary torque sensor 1 Adjust the torque of power tool to the minimum torque setting. 2 Connect the power tool to the “input drive” side of the rotary sensor. Connect bit and/or adapter to “output drive” of the rotary sensor. Connect the sensor to a torque analyzer and follow the operating instructions for that analyzer. 3 As the power tool engages the fastening joint and torque is applied the rotary torque sensor will detect a maximum peak applied and the torque reading will be displayed. 4 The power tool is then adjusted up or down of its torque capacity and retested until achieving the desired torque value for the application. 5 Once the desired torque is set, several torque readings need be taken to evaluate the tool’s repeatability. The lower percentage value of repeatability, confirms accuracy and reliability of the tool’s fastening cycles for the fastening process. Mountz recommends a CmK test study to preset a power tool, taking in consideration the tool’s speed, accuracy, and the target torque with low and high torque limits, to perform the test. The result will be based on tool’s performance for the intended fastening application for the manufacturing process. Tool accuracy can’t be based on a tool’s performance alone. 6 A good quality assembly process requires all torque tools to be verified with a torque measuring device on a daily basis.
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