Atacama Yellow 35is build thread

[B21]

I always wondered how you could accurately torque up a nut that you couldn’t get a socket on…

Result..

[Reamesy]

They will come in very handy too, for hard to reach nuts and bolts

[enuff_zed]

I always wondered how you could accurately torque up a nut that you couldn’t get a socket on…

Result..

Because I'm a pedant; you are extending the length of the lever slightly by using those.
Plius of course, the effective length will vary depending on the angle you connect the head to the wrench.
No doubt you'll come up with a clever calculation to adjust the torque setting slightly.

[Christopher72]

Crowfoots rock, especially in not slipping off the bolt/nut. I can see how it would be valuable when extending.

[BMWZ4MC]

When you use these with a ratchet handle or breaker bar, isn’t the centre of rotation at the centre of the square drive couple, and so offset from the nut by the length of the crow drive? Doesn’t the square drive couple orbit the nut effectively make this a crank?

[B21]

BMWZ4MC and enuff_zed

If you use the crowfoot attachment so it’s at 90 degrees to the torque wrench rather than inline then there is negligible alteration to the applied torque ..if you prefer to use it inline then it’s a simple calculation to adjust it..


https://youtu.be/-hSmtLVESSM?si=GT3KiSnZEi01IMyk

[enuff_zed]

BMWZ4MC and enuff_zed

If you use the crowfoot attachment so it’s at 90 degrees to the torque wrench rather than inline then there is negligible alteration to the applied torque ..if you prefer to use it inline then it’s a simple calculation to adjust it..


https://youtu.be/-hSmtLVESSM?si=GT3KiSnZEi01IMyk

Exactly.
At 90 degrees I believe old Pythagoras and his 'sum of the hippopotamus' comes in to play.
However, with your background Peter, I am sure you are aware that the chances of your torque wrench being accurate enough to matter are fairly low.
Even with 3 monthly calibration regimes, we always had to set the torque wrenches using the test rig in the stores before we went to the aircraft, and ensure we fully unwound the spring when we had finished.

[BMWZ4MC]

I wasn’t concerned about the calculation for correcting the torque at any angle from 0 to 90 deg. Rather, I don’t understand how a lever can exert a rotational force on a nut when the centre of rotation of the applied moment is offset from centre of rotation of the desired effect. I’m sure I’ve missed something since these are commonly used tools!

Besides, my torque wrench came from Aldi (although I do use somewhat more expensive torque wrenches at work)

[enuff_zed]

Rather, I don’t understand how a lever can exert a rotational force on a nut when the centre of rotation of the applied moment is offset from centre of rotation of the desired effect. I’m sure I’ve missed something since these are commonly used tools!

That's the same as using one of those curved spanners for restricted access.
In fact, even something as simple as Stilson wrench has the jaws offset from the handle.

Once the two parts are connected together they basically become one solid tool. The force is transmitted ok, but the leverage is changed, affecting the relationship between the force you apply and the force the nut receives.

[BMWZ4MC]

That’s true, thanks. I’ve not seen these before, but I’m sure it’s pretty intuitive as soon as you use it.
I suppose it wouldn’t work too well when trying to use a torque wrench with a ratchet handle since that would give a rigid couple at a fixed angle (and so known torque correction) in the “locked” direction, but then that angular relationship would change as soon as the ratchet handle is turned in the “free” direction, necessitating recalculating the torque correction.

[B21]

BMWZ4MC and enuff_zed

If you use the crowfoot attachment so it’s at 90 degrees to the torque wrench rather than inline then there is negligible alteration to the applied torque ..if you prefer to use it inline then it’s a simple calculation to adjust it..


https://youtu.be/-hSmtLVESSM?si=GT3KiSnZEi01IMyk

Exactly.
At 90 degrees I believe old Pythagoras and his 'sum of the hippopotamus' comes in to play.
However, with your background Peter, I am sure you are aware that the chances of your torque wrench being accurate enough to matter are fairly low.
Even with 3 monthly calibration regimes, we always had to set the torque wrenches using the test rig in the stores before we went to the aircraft, and ensure we fully unwound the spring when we had finished.

The way I looked at it it was better than guess I’m with an open jawed spanner…

What did horrify me was the effect of anti seize on the amount of torque transmitted to the nut/bolt…im waiting for some past tightening using that to snap..

[B21]

That’s true, thanks. I’ve not seen these before, but I’m sure it’s pretty intuitive as soon as you use it.
I suppose it wouldn’t work too well when trying to use a torque wrench with a ratchet handle since that would give a rigid couple at a fixed angle (and so known torque correction) in the “locked” direction, but then that angular relationship would change as soon as the ratchet handle is turned in the “free” direction, necessitating recalculating the torque correction.

I didn’t realise the Lidl torque wrench was so sophisticated?

[BMWZ4MC]

That’s true, thanks. I’ve not seen these before, but I’m sure it’s pretty intuitive as soon as you use it.
I suppose it wouldn’t work too well when trying to use a torque wrench with a ratchet handle since that would give a rigid couple at a fixed angle (and so known torque correction) in the “locked” direction, but then that angular relationship would change as soon as the ratchet handle is turned in the “free” direction, necessitating recalculating the torque correction.

I didn’t realise the Lidl torque wrench was so sophisticated?

Aldi, please, I wouldn’t ever admit to buying tools in Lidl

[BMWZ4MC]

What did horrify me was the effect of anti seize on the amount of torque transmitted to the nut/bolt…im waiting for some past tightening using that to snap..

I experience terrible dissonance about the use of anti-seize, especially when it comes to wheel bolts…

[B21]

That’s true, thanks. I’ve not seen these before, but I’m sure it’s pretty intuitive as soon as you use it.
I suppose it wouldn’t work too well when trying to use a torque wrench with a ratchet handle since that would give a rigid couple at a fixed angle (and so known torque correction) in the “locked” direction, but then that angular relationship would change as soon as the ratchet handle is turned in the “free” direction, necessitating recalculating the torque correction.

I didn’t realise the Lidl torque wrench was so sophisticated?

Aldi, please, I wouldn’t ever admit to buying tools in Lidl