Calibration & Audit Equipment
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About Calibration & Audio Equipment
The ability to accurately measure, verify, and analyze torque is critical in many assembly processes. The Rhino Tool House team has the expertise to help our customers in choosing the correct torque measuring product to cover application requirements before, during, and after assembly.
When considering measuring torque for either the calibration of your assembly tools or post torque auditing of your assembly process, you must determine whether you need to measure torque dynamically or residually. Both are particularly important as they offer different ways of ensuring the accuracy of your assembly tools and process.
We help many of our customers take it a step further by doing complete joint studies on their components. They build parts using rotary transducers and save the torque traces to ensure that they achieve the clamp load the joint requires.
While doing these tests, the fastener can be taken to yield or failure, after which the company determines the proper torque setting that stretches the fastener but stops short of the yield point at which the bolt is permanently deformed.
Dynamic Torque
Dynamic torque refers to operating the torque measurement tool on a rotary transducer using a joint kit or the actual part. At least 5 readings should be taken to ensure that you have the desired results. When doing a tool capability study, best practice is to perform approximately 25 rundowns to determine key statistics such as process capability (Cp and Cpk).
Taking dynamic readings requires a rotary transducer and a torque analyzer. Wireless transducers are available to help obtain readings while running production parts. Normally, you take only 5 rundowns this way to get a good feel that the tool is producing the specified torque and you are within your engineered upper and lower torque limits.
Most torque tools, with the exception of impact tools, are measured this way. We recommend doing only residual checks with impacts, as the hard-hitting mechanism of the anvil and hammer is extremely hard on the transducer.
Residual Torque
Another way to determine torque accuracy is to take residual readings after using the digital torque measuring tool on the part being assembled. Most companies use a digital torque wrench with a transducer and angle encoder to measure the installed torque by pulling in the tightening direction.
This is called “break-away” torque and, despite what some believe, it measures the torque where the bolt “breaks” free from friction while pulling in the tightening direction. Some precision torque wrenches calculate this movement for you, which takes the operator’s influence out of the equation while determining true installed torque.
