Which torque wrench?

[slowmotion]

[QUOTE 4242962, member: 9609"]I once tested an old torque wrench that had not been used for quite a few years by attaching the drive in a vice, sliding a metal tube over the arm and fillng a bucket of water attached to the end of the tube - when it clicked I calculated the torque (inc weight of steel tube) and I was quite surprised at the accuracy, I can't quite remember the figures but for instance if it was set to 90 lb ft then my calculations were 85 or something. tested it over a fair range of diff settings and it never seemed too far out.
Obviously if what you are going to use the torque wrench for is of any importance then you should get it tested at a proper laboratory that specialises in such things

but here is a pic of my (probably) idiotic testing.

[/QUOTE]
Class!

 

[Profpointy]

[QUOTE 4242962, member: 9609"]I once tested an old torque wrench that had not been used for quite a few years by attaching the drive in a vice, sliding a metal tube over the arm and fillng a bucket of water attached to the end of the tube - when it clicked I calculated the torque (inc weight of steel tube) and I was quite surprised at the accuracy, I can't quite remember the figures but for instance if it was set to 90 lb ft then my calculations were 85 or something. tested it over a fair range of diff settings and it never seemed too far out.
Obviously if what you are going to use the torque wrench for is of any importance then you should get it tested at a proper laboratory that specialises in such things

but here is a pic of my (probably) idiotic testing.

[/QUOTE]

that testing is totally pukka - not idiotic at all. Presumably that's pretty much what they'd do at the NPL. With a bit of care 1% should be attainable.

Precision is the most important wossname as any fule no !