28-06-2018, 10:51 PM
(28-06-2018, 10:06 PM)JonE Wrote: The tide is starting to turn in favour of another trip to the secondhand tool shop...!
Yes, I'll be winging it over calibration buying secondhand, but it still had its barcode sticker on the handle... and I can always go and check it with someone owning a posh one that has a full service history and has only been used on Sundays...
No need to wing it.
Fasten the square end in a vice.
A 5 litre water can weighs 5 KG (11lb). Two of them, tied together with string weight 22lb.
Set the torque wrench to 22ft lb and attach the two water containers at a point 12" from the fulcrum.
The wrench should just click (with a light push either way). If the weight needs to be moved further out to make it click it over reads (i.e. 22 ft lb on the scale is actually less in reality).
Any second hand tool shop that won't allow you to test it or return it if it's more than an agreed amount out isn't worth buying a torque wrench from
Charles