M
Monkeybusiness
Well-known member
My Intermercato hitch came loose after a couple of hours use (I assumed stretched bolts). I dogged the life out of it and it’s never moved since.
V8Druid
do it as well as you can,but learn to do it better
V8Druid
do it as well as you can,but learn to do it better
8.8s or 12.9s? ... if the latter, more likely wear in the seating material
GazCro
Well-known member
The authority on such items does not recommend bolting headstock on but welding and gusseting
Canal Navvy
Well-known member
I wonder how many people can be bothered to scrape the paint off before they assemble 
CPS
Well-known member
Or I didn't tighten them enough8.8s or 12.9s? ... if the latter, more likely wear in the seating material
doobin
Well-known member
Buff the paint off with a stripping disc, and use a decent size Allen key plus a spanner for leverage. And thread lock. Been fine and I’ve given it some stick!
JD450A
Feral as Fk 🐾
Trouble is the majority of ret.. professionals don't have the suitable tools for such work, understand or know the torque requirements for bolts/threads and generally will view dogging something up with a scaffold tube to be the way to tighten something..... A major manufacturers agent's fitter showed up in a van to rectify a loose counterweight and proceeded when asked if he had a torque wrench to explain they just have scaffold tubes.... (genuinely)
Paint is another issue too, and rust.
Of course you can weld it..... perhaps that's also the solution to loose tappets.
Paint is another issue too, and rust.
Of course you can weld it..... perhaps that's also the solution to loose tappets.
S
Smiffy
Well-known member
What people don't understand and this particularly applies to tyre fitters it seems is a torque wrench allows you to do everything to the same torque. A scaffold pole does things tight but all to a different tightness. Therefore risking putting the whole load through a single bolt. I also wonder if they bothered doing them up in a diagonal pattern.
JD450A
Feral as Fk 🐾
Doubtful..... I mean in all likelyhood it was done in a circular pattern with the Ugga Dugga gun.
Another thing that fucks me off is ugga duggaing all the nuts tight and then "checking" with the torque wrench.... I once told a ATS apprentice to f****ng do one and put my own tires back on and torqued them for this reason..... ****.
Canal Navvy
Well-known member
I once read a paper on the use of ultrasonic measurement to stretch fasteners by a defined amount. It was observed that an experienced fitter could achieve results as good as a torque wrench as they took account of the running resistance and "felt" the fastener.
In my tyre fitting days I was reasonably confident of spotting overtightened wheels on silage trailers as they came up to torque too quickly and would change the studs before they went ping
In my tyre fitting days I was reasonably confident of spotting overtightened wheels on silage trailers as they came up to torque too quickly and would change the studs before they went ping
V8Druid
do it as well as you can,but learn to do it better
an accomplished art .... getting it 'just' right' ...... that only experience can teach, if one is 'able' to learn
Lancs Lad
Well-known member
After two years full time on the spanners I reckon I "got it" that's using same gun and same setup but takes some feel ...but the idea of doing them full tilt with windy then checking them with torque wrench is cloud cuckoo but very common
Bri963
Well-known member
No way. Even an experienced fitter will vary how tight he does things by hand throughout the day. Seen that many times, and the aftermath of loose or sheared bolts, or crushed gaskets and seals. We’ve also seen through the years that “experienced fitters“ can’t always use a torque wrench properly or consistently. I’ve seen people go round and give it a bit more after the click, just to make sure, or completely ignore the recommended tightening pattern, because it isn’t the way they were taught in the army or wherever. There are some parts on Cat machines where the tightening pattern is the complete opposite of the tradition way. Experienced fitters rely on their experience, good experienced fitters do the same but are prepared to keep learning and discard what’s out of date.
craig
Well-known member
The trouble is your talking about fitters not mechanics 
Canal Navvy
Well-known member
I'd be disappointed if a torque wrench properly used wasn't more consistent than a human. It would seem that torque applied to a threaded fastener does not always stretch it by the same amount and torque wrenches don't notice this whereas humans can.
Actually measuring the change in length as a torque wrench applied the force just flagged up that they are inconsistent too.
I'll have to see if I can find the paper, I came across it when looking at the changes in stress/strain in wheel studs that had been overtightened
Actually measuring the change in length as a torque wrench applied the force just flagged up that they are inconsistent too.
I'll have to see if I can find the paper, I came across it when looking at the changes in stress/strain in wheel studs that had been overtightened
JD450A
Feral as Fk 🐾
Trouble is you are talking about fitters and mechanics and not engineers.The trouble is your talking about fitters not mechanics
Quattromike
Well member-known
But worse than that with all fitters, mechanics and engineers you still need the knack. And not everyone does
.
Gecko
Well-known member
The trouble with torque wrenches and humans is they both try to measure torque, when the desired result is bolt tension.
Unfortunately, a torque wrench or 'experience' is usually only practical way of getting close.
If the tension is really critical, hydraulics is the way to go.
Unfortunately, a torque wrench or 'experience' is usually only practical way of getting close.
If the tension is really critical, hydraulics is the way to go.
Canal Navvy
Well-known member
Ultrasonic sensor on one end to measure the extension of the fastener, cross reference to the pressure and you can produce a strain/stress curve.
From this you can spot faulty fasteners, badly seated ones and other anomalies that ought to be looked at ..,...bootiful
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