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Likes: 975
Views: 15436
As an engineer in my opinion your analysis of lthe torque wrench is wrong. If you put your hand half way down the shaft on the torque wrench you are applying twice the force at that location to apply the same torque i.e. torque = force x distance. There is only 1 fulcrum point at the center of the drive it makes no difference where your hand is, its an inflexible shaft it just means you yourself are going to apply more force at a closer location. The second component of the torque wrench is an axiel force along the axis of the shaft so the the roller can slide to click it. In saying that i always torque from grip point as it makes torquing easier.
Agree with most of what you say. Except for some of the info around the use of a crows foot. If there is no extension bar on the crows foot then I am fully aligned with your comments. When there is an extension then you can only transmit torque from the wrench to the crows foot. The linear force is not reacted at the Crows foot. Therefore the moment arm length is not changed.
Thank you for a thought provoking video.
I do not thing the issue is the change in the lever arm ratio but the normal load required to induce the moment.
I base this on the basis the the outer tube would not be deforming, .hence not changing the geometry. Of the mechanism.
Yes in favor of a calibration video.