Definition of foot-pound : a unit of work equal to the work done by a force of one pound acting through a distance of one foot in the direction of the force
Very nice ! But did you calibrate the luggage scale you are using ? I assume you did with all the checks and rechecks you do, but nonetheless, that would be an important thing to make sure it was accurate.
Incorrect. This will give a wrong calibration. It cannot be used for click type torque wrenches, especially on the long one which will show a much higher reading than it is.
Precisely incorrect. The 12" point on a 15" torque wrench doesn't give you the correct torque. Don't take my word for it. It's not how they work. Logic may tell you is does. Sure someone can correct me but it's 64ft/lbs at 15" to give 80ft/lbs. Measure that as 80ft/lbs at 12" and you will be over torquing.
You are correct. This type of wrench with the offset pivot must be calibrated (and used) from the Force Loading Point, which is commonly indicated by a ring or rings as can be seen here, or a colored dot or crosshairs on a plastic/rubber grip, at mid-position on the handgrip. If a wrench that has been adjusted utilizing a force applied elsewhere is then checked and calibrated correctly by the standard, it will be found to have been delivering the wrong torque. The method shown can only be accurate for a wrench with a 12" Force Loading Point Distance.
@@MightyGimp Edit: Specific force values mentioned refer to a previous posting that is now gone. If you were using a torque wrench of this design, you certainly could apply the 80lbs force at 1 foot from the fulcrum and have the right torque output, but there would be no indication to tell you to stop until you reached a greater force, delivering excess torque. Conversely, if a handle extension (cheater) is used, the click indication would occur a little before you reached the desired torque figure, so you wouldn't be applying 75ft/lbs at the time of the click. This effect is usually called Length Dependency, and occurs because the wrench uses a dual-lever unequal length design, consequently it doesn't operate as a simple lever for mechanical advantage. There are a number of demonstrations of this on RU-vid - hopefully this channel doesn't object to links. The classic is from Park Tools: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BPe1-bDFVRM.html And I have a simple one on my channel demonstrating with an angle-of-the-nut method: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5_8vPCRlQ_U.html
