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Measuring Torque Matters - Here's Why

The torque-to-load capacity relationship is an empirical method originally developed by the A. B. CHANCE Company beginning in the late 1950s. 

As a helical anchor drills deeper into increasingly dense or hard soil, the principle predicts an increase in installation energy or torque. Also, the higher the installation torque, the greater the axial capacity is of the installed anchor.

In other words, by measuring the torque, engineers can better understand the load capacity of the anchors in the soil. However, what is the best way to accurately determine an anchor’s load or torque?

Measuring Torque

There are many answers to this question but one solution stands above the rest.

How Others Traditionally Measure Torque

The most common torque measurement methods include determining the amount of strain that occurs due to anchor shaft twist, using a differential pressure transducer or measuring the life spans of torque limiters (shear pins) in order to figure out torque-to-load capacity.

While these methods work well enough, their precision leaves something to be desired, and none of them offer continuous readings that allow engineers to measure torque as conditions change.

There is one more method, though. The continuous torque indicator gives engineers precise, real-time data. For those who take torque-to-load capacity seriously, this is the solution we recommend.

The Benefits of a Torque Indicator

The CHANCE® digital torque indicator, manufactured by Hubbell Power Systems Inc., is a continuous reading indicator. It outdoes traditional torque measurement in a number of ways.

First, a continuous torque indicator helps prevent any excess torsional loading with potential to damage an anchor. With such a device, it's actually possible to determine torque value ahead of time and install screw anchors accordingly. Therefore, the user already has a good idea of a specific anchor's holding capacity in the soil.

The CHANCE wireless indicator, specifically, is easy to use, thanks to its simple design — a straightforward torsion bar and strain gauge. It fits tools with both 5 1/4- and 7 5/8-inch circles and easily transfers from one machine to another.

The CHANCE indicator's digital display reads the torque continuously, so any changes are measured in real time. Those measurements can even be logged in an optional remote data logger.