On 18/02/2018 17:04, ultred ragnusen wrote:
> wrote:
>
>>> Does anyone know how to calibrate a torque wrench at home?
>>>
>>
>> Clamp head with handle horizontal; hang bucket of water measured
>> distance from head; add water until clicks; weight bucket; do sum.
>
> On a diagram, I see how hanging a known weight a known distance from the
> head will test the torque to see if it's correct ... but ...
>
> And I can visualize how to mechanically clamp a bolt in a vise to hang the
> torque wrench on - but then - how do you calibrate the two types?
>
There are loads of videos on YouTube which may help - eg

https://www.youtube.com/watch?v=lZUDH13yln0

NB he failed to correct for the weight of the torque wrench itself which
- to a first approximation - acts through a point halfway along its
length

If it's a wrench where you read the torque then you can just take a
reading with a bucket of water and compare it to the results of you sum
- and repeat for heavier/lighter buckets.

If you've a hydraulic wrench then I pass.
--
Robin
reply-to address is (intended to be) valid