![]() ![]() If the operator pulls through 3 degrees of rotation and stops at 4 degrees of rotation, the tool will read torque at 4 degrees of rotation. ![]() Our tools are fully capable of getting an accurate reading at 3 degrees of rotation. If your operators are inexperienced, we recommend using 3 degrees as the TARGET ANGLE setting. If your operators are highly skilled, they typically can use a P-SET where the target angle is zero and they can get accurate results. Using the correct parameter settings is imperative in creating an accurate Residual Torque reading. ![]() The tool can only tell you the torque at the time of the audit. While a good tool with residual mode will provide an accurate assessment of the clamp load, there is no way to tell if the joint relaxed, or by what percentage it relaxed. There can be changes in the clamp load between the time the torque was applied and the time that the torque value audit is conducted. Please note, due to surface conditions, joints can relax. Once torque has been applied to a joint, an audit function measures exactly how tight that fastener was torqued. With the DTC you can read the torque and angle results in the tool, or you can connect to DTC CONNECT and upload the results log into a computer. If you are set the target angle to 3 degrees and pull past it, the tool reads torque at the point at which you stopped pulling. When you achieve the target angle, the display or light pipe on the tool side will turn green and the tool will emit the acceptance tone. The larger numbers in the main part of the display will show torque.Īs you apply torque the display will backlight. With the DTC, 1350 Series ExaTD, and the 1250 Series Exacta 2, when the tool is in Residual Mode, the upper left-hand side of the tool display will show the degrees of rotation. The default setting when using this method is 3 degrees. The other option is to set a number of degrees of rotation and then the tool will read the value at that point. With zero selected as the target angle, the tool will sense the drop in torque and report the peak prior to movement. Since it requires more force to place the fastener in motion, there will be a slight drop in torque once the fastener begins to move. One option is to enter zero as the degrees of rotation. In setting up the parameter for auditing fasteners, we give you two options for measuring residual torque. Residual torque is the amount of torque required to move relative to the mating threads. Our tools look at the peak torque prior to the drop that results in placing the fastener in motion. Once the fastener begins to move, there is a momentary drop in torque. Placing the fastener in motion requires more force to overcome friction to move from static to dynamic torque. When measuring residual torque, you are measuring the amount of torque required to place the previously static fastener into motion. We have tools that measure Residual Torque and these tools have multiple options for the audit that you are performing. When you are thinking about breakaway torque, you really want to know, how much clamp load is in the joint, or how tight is this already tightened fastener? Another term for breakaway torque is Residual Torque. Measuring torque on a previously tightened fastener is considered "Static Torque" where a fastener at rest, is being placed in motion. Torque application is considered to be "Dynamic Torque" or torque in motion that is changing. More importantly, when discussing torque measurement, we encounter a lot of misinformation about breakaway torque. We often hear questions about breakaway torque. ![]()
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