mikee":26xhrsuc said:
williams superslim
http://www.smithfrancistools.co.uk/slimtorque.htm
had mine for years top bit of kit
had it re-calibrated last year (we had the kit at work)
bang on even after the abuse i've heaped on it over the years
You had it calibrated, may I ask was it out ?
As my undertanding of the click stop screw variety is if you don't have the calibrator which has to be calibrated itself, you have to find somewhere that calibrates torque wrenches and certificates them, which costs.
But as regarding a recently calibrated device, just dropping it can render it out of cal, that is why I recommend beam wrenches, for one can see at a glance if the thing is reading right or not, and there is very little that can happen to the steel that it is made of, so torsional forces are usually ok. But I believe the calibration standard is, the thing is only in cal at 20 degree celcius, variations in temperature affect the calibration.
To use an uncalibrated measuring device like a click stop, it is a guide only and by no means a guarantee that the correct torque was applied, one could be under or worse, over the required torque value leading to the possibility of fatigued components that might fail at any point, temperature again is one, a rise expands metal and increases the torque.
Without a known measurement device one may as well just guess, even apply what you consider to be what poundage of force a foot away from the the centre of the fixing that is being driven, otherwise get a spanner and give it a gronk.
Interestingly, mechanics spanners are usually made to a length that it would prove hard, but not impossible to break a fixing by normal use. So correct application spanners should be used. Look at a normal say 8mm combination wrench compared to a 16mm combination wrench, should give you an indication of what torque can be applied to that fixing.
I used to be an aircraft mechanic and I have also worked in a calibration cell.