Measuring dynamic torque requires a solution that evaluates both the power tool’s performance and the fastening joint application.
A rotary torque sensor is used mainly to measure the torque output of power tools, including electric, pulse, and continuous pneumatic tools. Rotary torque sensors are mounted in line with the tool’s drive. It’s an instrument that quickly attaches to a power tool’s drive without interfering with its ability to fasten a screw or bolt. As the tool’s operator, whether human or robotic, tightens the fastener, the rotary torque sensor measures how much torque is applied until the power tool shuts off.
Rotary torque sensors measure torque under joint conditions, returning the most accurate results possible. They are also compatible with measuring hand tools like torque wrenches and screwdrivers. Rotary torque sensors are commonly used for torque verification and auditing programs.
The rotary torque sensor has a rated torque range capacity. The power tool’s torque capacity must fall between the sensor’s torque range capacity. Mountz recommends that the power tool’s maximum torque capacity fall between 20% and 80% of the torque sensor’s capacity.
How to Measure Power Tool Torque Output With a Rotary Torque Sensor
1. Adjust the torque of the power tool to the minimum torque setting.
2. Connect the power tool to the “input drive” side of the rotary sensor. Connect the bit and/or adapter to the “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 detects a maximum peak applied, and the torque reading is displayed.
4. The power tool is then adjusted up or down in its torque capacity and retested until achieving the desired torque value for the application.
5. Once the desired torque is set, several torque readings must be taken to evaluate the tool’s repeatability. The lower percentage value of repeatability confirms the 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 into 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 the 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 daily verification of all torque tools with a torque measuring device.
Keeping tools in calibration requires frequent torque verification. Over time, torque tools eventually drift out of tolerance. A rotary torque sensor is a vital tool for quality engineers to use for a torque verification process. The measurement results allow a user to verify that the tool is within its calibration limits, preventing under or over-torque fasteners that result in costly product defects and long-term liability results.
Torque measurement is a key component of any quality control process. Learn the key benefits of conducting a routine torque verification process with your assembly tools.
Mountz, Inc. can help your company increase safety and reduce costs with our full line of torque analyzers and sensors. To see our full range of products, shop our store. Contact us anytime to ask a question. To inquire about price, request a quote. If you’d like to see our equipment in person, schedule an appointment.
