Ball Loosened, Use Loctite?
From time to time my son or I have to tow bar his 1946 Chevrolet 2 ton rack truck. He uses it for his food catering business. Being it is old it breaks down once a year. So when booked to do a p...
Forum Discussion
babock wrote:
Like I said, the length of the torque wrench doesn't matter.
BTW....that drawing has been discussed many times on many mechanical engineering pages and it is incorrect. The length C does not matter. It could be 100 feet long and it wouldn't matter. The torque indicated at T1 is independent of length C. If you are going to cut and paste stuff off the internet, make sure it's correct.
BTW..that isn't a crows foot.
Yes, it does matter.
Think of it this way: Use a breaker bar instead. Right where you pull on the handle, there is force (from your hand) but 0 torque within the bar as there is no distance to apply that force. At the other end is the maximum torque. Everywhere in between along the shaft of the breaker bar is a linear progression of torque from 0 to max.
Now replace that breaker bar with a torque wrench. Everything is still the same and the wrench measure the torque at the bolt (i.e. the max).
Adding a crow's foot means the max torque is still at the bolt but the torque "seen" by the wrench is something less than that. The amount is proportional to the distance between 0 (where your hand is) and max (where the bolt is). The handle distance matters when using the crow's foot.
Adding a handle extension (i.e. cheater bar) when using the crow's foot changes where your hand is applied and therefore also affects the proportion of torque seen by the wrench.
With no crow's foot involved, a handle extension only changes the force needed since the wrench still measures at the bolt where it's needed.
