Thread: torque Wrenches

That's great Blknight.
Just used mine on the weekend replacing my injector harness and was questioning myself as to how accurate it actually was. It's now about 14 years old
Pity I live down in Sydney.
John

if you want to pay the tube postage there and back I'll do it.

Just cant guarentee it wont get dropped and rendered inaccurate.

Im looking up my old engineering books and am planning on making a test rig that should be copyable so anyone can easily do the testing.

Originally Posted by JES

That's great Blknight.
Just used mine on the weekend replacing my injector harness and was questioning myself as to how accurate it actually was. It's now about 14 years old
Pity I live down in Sydney.
John

John, mine's at least 50 years old (yes, I'm younger ) and last time it was tested it was spot on.
Age has no bearing, more how it's been looked after and the quality of it to begin with.

Originally Posted by Blknight.aus

Im looking up my old engineering books and am planning on making a test rig that should be copyable so anyone can easily do the testing.

It's really not that difficult to do. I did mine recently.
Just have to remember the basics of torque.

T = F x d

Where F = Force (Newtons), d = distance (m) from fulcrum to the applied force, T = Torque (Nm)
Of course you can work in feet and pounds too.

I used a 20L drum of water to apply the force (mass x 9.8) and hooked it onto the end of the torque wrench with the 1/2 inch drive clamped in the vise. The advantage is that it is easy to modify the mass for a variety of calibration points.

As an example, if I were to hang 10kg of water on the end of my torque wrench that is 0.5m long, then the expected torque is

T = (10 x 9.8) x 0.5 = 49Nm

The torque wrench is then calibrated to achieve this and then retested for other torques.

Of course this (and any other method) is only as good as the instruments you use to measure the mass of water and distance from the fulcrum.

Originally Posted by Blknight.aus

if you want to pay the tube postage there and back I'll do it.

Thanks for the offer Dave, but I'll wait to see what you come back with. Can probably use to check with Pauls method.

Rick, well it's been well looked after and it's a reasonable quality so worth checking it out as Paul described. Should be a bit of fun.
John

Originally Posted by JES

Thanks for the offer Dave, but I'll wait to see what you come back with. Can probably use to check with Pauls method.

Rick, well it's been well looked after and it's a reasonable quality so worth checking it out as Paul described. Should be a bit of fun.
John

the test rig is similar to that but the load is applied to a fixed 3 foot long lever and you work against that with the torque wrench. Ive mentioned similar setups in other posts.

Oh the other thing is IF your torque wrench passes all 15 odd parts of the test you get a stamp and a print out....