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In 1979, a major automotive dealer’s head mechanic was also the crew chief on his son’s racing team. He rose to head mechanic because he worked much faster than anyone else. He saved time by not using torque wrenches because, “I have a calibrated arm.”
He could tighten a bolt and then a torque wrench would show that, sure enough, it was almost dead on spec. But that wasn’t after a day of turning large bolts, and it wasn’t for cars that would be racing around an oval track with the engine running near the red line.
In a critical race, his son was in the lead in the last lap. Just as he came off the last turn, the car blew a head gasket. He finished sixth.
Are you doing electrical work with a “calibrated arm?” If so, infrared scans will eventually show the trail of failed connections you’ve left behind you.
Making a proper bolted connection isn’t a matter of “turning until it’s tight.” It’s a matter of applying a specified rotational force to a fastener. We call that force torque.
The torque stretches the bolt to just under its elastic limit (the point at which deforms). The bolt’s trying to get back to its original length. The tension thus created is what keeps the bolt from coming loose. Too little tension, and the bolt does come loose. But stretch the bolt past its elastic limit, and you just don’t get that tension.
Source: Mark Lamendola | Mindconnection