WHITE PAPER FGC PRESET CAM OVER PRECISION TORQUE WRENCH
Click Wrench Mechanism The most common type of torque wrench in the world, and the simplest, is the click wrench (see Figure 2). Click wrenches are basic tools. Most click wrenches are built with an internal spring mechanism that is compressed against a lever. A click wrench typically deflects by 3° and emits an audible “click” sound when the predetermined torque amount is reached. The click mechanism is not a 100 % process safe as the wrench is easily susceptible to torque failures and over-torque results. Often an operator misses the “click” sound nor feels the click movement. Because a click wrench does not physically prevent an operator from applying additional force he/she unknowingly generating over-torque. Cam-Over Wrench Mechanism Engineered with a cam-over technology, the poka-yoke wrench prevents over-torque. The wrench uses an internal cam-over mechanism
to physically prevent the operator from over- torquing fasteners by slipping, or disengaging once torque is reached (see Figure 3). Even if operators try to use the tool on the same fastener after it has slipped, it will simply slip again, refusing to deliver more torque than specified. This total control over the torque delivery renders cam-over wrenches ideal for the most critical torque applications. Safeguarding against fastening failures requires you to deploy a torque wrench designed error-proofing for the assembly process. Implementing this error-proofing wrench removes the operator’s influence out of the torque equation and delivers an accurate and repeatable fastening result than a standard click type wrench. You can provide cam-over wrench to any operator and have the confidence that he/she will deliver the correct torque, time after time. See Figure 4 on the following page that compares wrench mechanisms.
3°
Figure 3: Cam-Over Wrench Mechanism
Figure 2: Click Wrench Mechanism
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