Torque Testing - Important for Fasteners

Thursday, November 5, 2015

What is Torque?
Torque is the angular force required to turn something. For example, the amount of force it requires you to turn a steering wheel or the force provided by an engine to turn the propeller blades on an airplane. 

What is Torque Testing?
Torque testing involves measuring the amount of angular force applied to an object. It is essential to test any product with rotating parts such as engines or fasteners.

There are two types of torque testing – reaction and in-line.  In-line torque testing measures the torque required to turn the rotating part.  Whereas, reaction torque testing measures the amount of torque required to prevent rotation.

Common Applications
Assembling complex products can often involve thousands of fasteners, many of which are bolts or screws that are tightened by some sort of torque driver. If a fastener fails, then the entire products can be affected, so it is imperative that the manufacturer ensures that the fastener has been properly tightened and not damaged during the fastening process.

One of the most comprehensive ways to analyze torque is to use process signature analysis. Process signatures provide insight into the variables that contribute to the overall product quality. Looking at the fastener as a whole allows for inspection of installation and root cause analysis.

Another way to analyze torque is with torque-to-turn tests. This measurement is essential for any product whose essential function involves rotating, such as an axel. There are two basic categories of torque-to-turn tests – breakaway torque and running torque.  Breakaway torque is the amount of torque required to start rotating from a stationary position. Running torque is determining how much torque is required to keep the part rotating at a constant velocity.

Summary
Torque testing is essential to manufacturing to ensure good assembly. Using process signatures can provide valuable information to the root cause of a failure. By examining the fastener as a whole you are able to better identify and address the source of the problem.

For further information on fastener testing, visit our website or contact us today!


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