With a load of 6.3kn ( double ) when you fix a check double how can it double up to 12.6kn, on any system the max load is the weakest link ie. the double at 6.3kn... how can by fitting a check make it 12.6kn...??? each double will slip ( alledgedly ) at 6.3kn....
check fittings
- Thread starter cala
- Start date
Well at the risk of looking like a total tw at is it not doubled as there are 2 of them. Is that not why some jobs could have 5 or 6 checks on them just to up the load?
---------- Post added at 06:26 PM ---------- Previous post was at 06:26 PM ----------
Especially when dropping off a hanger.
---------- Post added at 06:26 PM ---------- Previous post was at 06:26 PM ----------
Especially when dropping off a hanger.
scaffman1
Well-known member
I think you may have something there aom.
Should av been a professor of scaffolding me thinks ........lol
Should av been a professor of scaffolding me thinks ........lol
J
Jason-Gibbs
Guest
I heard somewhere - more then likely this Forum, that for every fitting used as a check fitting the strength halves, or something to that degree.
A Double = 6.3kn.
2 Doubles = 9.45kn.
3 Doubles = 12.525kn.
And so on.
More then likely not, but im sure i heard it somewhere.
A Double = 6.3kn.
2 Doubles = 9.45kn.
3 Doubles = 12.525kn.
And so on.
More then likely not, but im sure i heard it somewhere.
haha, there are a few old teachers down Campbeltown way that have just turned in their grave.:nuts:
---------- Post added at 06:38 PM ---------- Previous post was at 06:36 PM ----------
Jason, I think you are right, that's why you see some with multiple check's.
Haha scaffman, a bit soon to look out the white coat yet then.:laugh:
---------- Post added at 06:38 PM ---------- Previous post was at 06:36 PM ----------
Jason, I think you are right, that's why you see some with multiple check's.
Haha scaffman, a bit soon to look out the white coat yet then.:laugh:
scaffman1
Well-known member
J
Jason-Gibbs
Guest
Not sure.
I suppose Luck will factor into it, also.
Not every fitting is 100% the same... especially if they are old and used.
Some have been tightned up more then others, some have been stretched more/less, some have crap on the threads/gates and so on.
I suppose Luck will factor into it, also.
Not every fitting is 100% the same... especially if they are old and used.
Some have been tightned up more then others, some have been stretched more/less, some have crap on the threads/gates and so on.
scaffman1
Well-known member
Cala, think of it as holding something with one hand, and then with two hands....... Better grip, right...
That's why check fittings should always have daylight between them.
I see what you were getting at now Cala. I'm obviously not sure of the exact loads but I think Jason was right when he said it does reduce but it still ups the loads. If one is starting to just slip there will not be the same load on the next and practically nil on the third.
The usual disclaimer applies.:embarrest:
---------- Post added at 06:56 PM ---------- Previous post was at 06:53 PM ----------
That's a new one on me Swifty, I was always taught to turn the check upside down and at right angle to it's neighbour so it fits snug almost male and female like so it was tight.
Doing part two with John Ellis at the moment. It's 6.1kn for the double it's then reduced by 50% per check (complimentary) fitting. So the second fitting is 3.05kn & then 1.52kn so & so fourth from there. So basically by the time you reach the fourth fitting, in theory it's doing nothing.
Hope this helps.
Hope this helps.
Oh yeh... were did I get 6.3 from ?? must be this San Miguel.. thanks mate, great reply...
AOM... I cant even spell what you posted
As for the daylight thing... I heard of that, personally I fit mine at 90 degrees and tight.... anyone do owt different ?
Oh yeh... were did I get 6.3 from ?? must be this San Miguel.. thanks mate, great reply...
AOM... I cant even spell what you posted
As for the daylight thing... I heard of that, personally I fit mine at 90 degrees and tight.... anyone do owt different ?
eh, to be honest, either can I. :laugh:
paddy carr
Moderator
Ram the check up at 90 degrees then blast it with the Makita
The makita solves all don't it Paddy. Starting to get a wee bit concerned about over tightening though. We were on a small job last week over vats and I gave a single a quick nip while we were levelling, I then asked the guy I was working with to change it round the right way and the veins in his neck bulged as he tried to loosen it. He is built like a may pole right enough so not sure if I over tightened it or if he really is as weak as a kitten.
its the same as you may see steelwork with 2 bolts its to check the first 1 from slip or movement.its called a check for the simple reason its there to check,any more than 2 checks double up the droppers or pick-ups.