Torque Wrenches ..hmm.

Liam Healy ( snipped-for-privacy@aol.com) gurgled happily, sounding much like they were saying :

Congratulations...

eBay. "Very good quality"...

Look, she's buying, right?

There Can Be Only One URL You Need Visit.

Norbar. Had a pair for many years and they've been great. The middle sized one will do near everything on an SDI, 20 - 120 ft.lb. The smaller one I also have starts at 10 ft.lb. Don't understand this nM nonsense. ;-)

Well, given that good quality torque wrenches can and should be recalibrated periodically, what's wrong with buying a good brand used example at the right price and getting it fettled?

Seconded. I bought a Norbar for my first Imp. Never wished for anything better.

Likewise don't understand NM. Didn't Newton invent gravity?

Jim

No, he discovered it, not invented it, which is why a Newton is a unit of Weight, whereas pound, kilo etc etc are a unit of mass. If you go into space, you still have a mass of 80kg, but will have a weight of

Put simply, a Newton is a unit of force, it is the force required to give a mass of 1kg an accelleration of 1metre/second/second. Thus as the earths gravititational field gives an accelleration of (very) approximatly 10m/s/s, 1kg = 10Newtons.

A Newton Metre is simply a force of 1 newton at a distance of 1 metre from the pivot, as opposed to lbf.ft (correctly known as Pound Force Foot, not Foot-pounds) which is 1lb of force at a distance of 1 foot from the pivot

Alex

Still, being a classics group, I'd make sure the wrench is marked with both, since most classics will be quoted in lb.ft.

Alex realised it was Tue, 29 Nov 2005

And the SnapOn ones cost ten times what they're worth.

Good stuff, but waaaaay overpriced.

Just to confuse matters, companies like SnapOn make torque wrenches in Nm, KgM and lbf.ft

Alex

The message from Alex contains these words:

No doubt you know your onions but those unfamiliar with the fps system might conclude from the above that a foot-pound aka ft-lb (a measure of work done) does not exist.

Work done would be measured in ft lb-force/minute, not pound-force feet.

Ironically, it doesn't make a difference:

Alex

Whoops, that should be

As 1 Watt is 1 Joule in 1 Second which is 1 Newton through 1 Metre in

Alex

My choice of words was very much tongue in cheek, but I forgot the smiley :-)

Conversions kept for future reference. Thanks Alex.

Jim

The message from Alex contains these words:

Seems I was wrong. You do think the foot-pound is a bogus unit.

FWIW work done is force times distance (energy expended). Including time gives the rate of doing work.

For the sake of balance it should always be made clear that gravitation is only a theory.

There is no gravity. The Earch sucks.

Geoff MacK

"Which Tyler led the Pedants Revolt".

There are those who believe it's Intelligent Falling....

Ron Robinson

After learning the cgs system at school and having to convert to fpm at technical college I am afraid I gave up when confronted with knm. But I always thought that Torque was measured in lbs.ft to distinguish it from any other old Force which is ft.lbs.

Ron Robinson

I've used a Britool torque wrench for as long as I can remember. It's extremely robust. I like the Norbar ones but I don't think I'd like to give them the scaffold pole treatment!

Britool's recalibration prices !

If you have (or can arrange) a dead-weight tester, then it's practical to re-calibrate a Snap-on torque wrench yourself. With a Britool though, forget it.