WHITE PAPER FGC PRESET CAM OVER PRECISION TORQUE WRENCH
User Case: Automotive Powertrain Assembly The powertrain assembly process is one of the highest quality standard requirements for any type of automotive vehicle being manufactured. Assemblies and subassemblies for motors and transmissions on the vehicles are considered critical assembly processes where the highest technology for torque fastening available is a must. In June 2008, Mountz was asked by a long time global automotive customer to help resolve a nagging, repetitive torque issue. The automotive manufacturer needed assistance in determining the best way to manually assure that bolts holding the transmission oil pan were tightened correctly to a proper torque value. The manufacturer was using an electronic DC Controller for the fastening application (see Figure 6). They were needing a secondary QC process and a precision torque instrument to ensure the fastening operation was correctly torqued. The additional safety step for the final assembly process was to deploy a means to have a “Go or No Go” verification on the assembly line. The error-proofing solution would verify and guarantee that all the nuts holding the oil pan where tightened to target torque without over-torquing the bolts. They wanted to error-proofing solution that would provide an extra layer of security on their fastening process. Mountz offered a preset cam-over torque wrench that would accurately and
repeatability reach the target torque and would cam-over once the designated torque value was correctly and consistently achieved. The cam- over technology safeguarded against fastening failures and provided an error-proofing process for this critical tightening application. This process has been replicated by other global automotive manufactures on similar torque applications. Making a Business Case for Upgrading Your Click Wrench to a Cam-Over Wrench Click wrenches are so popular because they are inexpensive as compared to other types of torque tools. A click wrench doesn’t stop the operator from applying too much torque—the tool simply informs the operator in time to stop themselves. The most obvious upgrade from a click wrench is to a cam-over torque wrench, which physically prevents its operator from applying too much torque. Stopping over- torque occurrences requires the deployment of a torque wrench designed error-proofing for the assembly process. Error-proofing the tightening process improves the quality control method for manufacturers by reducing the number of defective products pulled from the assembly line and hedging the risk of liability from product failures in the field. A screw rattling loose in the avionics of a high-performance jet or from an implanted medical device can cause major liability and reputational damage. Preset cam-over torque wrenches are the best wrenches for high-level process and quality control. The tool’s repeatability, traceability, and precision grant companies the peace of mind of knowing that their critical products will stand up to use. Locking down the manufacturing process with documented, secured torque applications for each fastener improves profit margins by guaranteeing quality assurance.
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