Re: Brains trust question

[Orin Eman <orin@wolfenet.com>]

> If I hold the torque wrench as close to horizontal as possible with
> #2079 vertical, is the effect of #2079 nullified?

Yes, in this case.  Torque at the bolt would be read directly on the wrench,
assuming the force on the wrench is perpendicular to the handle.

> If I hold the torque wrench vertically, the torque multiplication effect
> becomes a torque division effect.  What setting to I then need on the
> wrench to get 450Nm at the bolt?  I can set the wrench up to 1000Nm.

> #2079 is 30cm between axes.  The torque wrench is a 'breaker' type -
> 79cm from the business end to the hinge, and 125cm from the business
> end to the centre of the handle.

Force at wrench handle for 450Nm at the bolt is 450/(1.25-.3)
ie about 474N (it's a rigid system until the wrench breaks).
The wrench will read 474*1.25 ie 592 Nm.

The distance of the wrench hinge is taken care with the wrench
calibration so we don't worry about it.  What the wrench really
measures is the force perpendicular to the handle.
Until the wrench 'breaks', we can treat the system as a shortened
wrench on the bolt, the 1.25 - 0.3.

I'd set the wrench to 600 and check it once you are in better
conditions.

Orin.