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Old 10 December 2007, 05:12   #21
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Quote:
Originally Posted by codprawn View Post
Self tappers are the spawn of the Devil - I would NEVER use them on anything!!!
Better not have too close a look under the bonnet of your car then........

"self tappers" or more accurately thread forming screws are no better or worse than nuts & bolts IF they are spec'ed properlty for the application. In some cases they actually hold better, because the threads of the screw totally fill up with the material they are screwing into, whereas a "standard" machined thread there's only about 1/3 of the thread (and most of it at the thread tip where the material is thinner) actually doing anything due to the manufacturing tolerances you need to make sure any nut of a given size will fit on any bolt.

There are numerous types of thread formers, some which are only specified for use with certian materials due to the shape of the treads. Assuming whoever used the screws spec'ed them properly, and did the maths to work out a suitably safe number of them to use, if the sealant didn't work properly (for whatever reason) then when the wood goes soft even thru' bolting is going to make no difference - it's going to pull out eventually!

And if you're fixing a console down, just how do you get under the floor to put the nuts on?
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Old 10 December 2007, 14:46   #22
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Self tappers as good as 'nuts and bolts'
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Old 10 December 2007, 16:07   #23
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IMVHO self tappers into ply backed glass can hold OK, althuogh requires sealing. Self tappers into any glass only - bad move. Not only does it tend to not have much holding power, the minute crack in the gel created as you screw in often propagates if the unit flexes.

Purely based on my own experience, no googling or recycling other peoples opinions (jw )

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And if you're fixing a console down, just how do you get under the floor to put the nuts on?
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Old 11 December 2007, 09:01   #24
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Just to add the way we do things - on our smaller RIBs with regular consoles they are fibreglassed down to the deck, we feel one advantage apart from the strength is there are no extra holes in the deck.
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When a boat looks that good who needs tubes!!!
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Old 24 December 2007, 04:14   #25
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The MAIB have now got round to officially publishing the safety bulletin relating to this incident:

http://www.maib.gov.uk/cms_resources/SB2-07.pdf
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Old 24 December 2007, 12:10   #26
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Hey Mollers, there's an example of good, professional workmanship,... and you wonder why I'm rather scathing of them.
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Old 24 December 2007, 13:31   #27
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Hi, it says in the report that 'ribquest have ceased trading'.

I found this on boats and outboards today

http://www.boatsandoutboards.co.uk/view/RIQ002

Does anyone know the story? Is it a new manufacturer? Have they changed the way seats are attached?
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Old 24 December 2007, 13:51   #28
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I don't like slef tappers

Quote:
Originally Posted by Matt View Post
IMVHO self tappers into ply backed glass can hold OK, althuogh requires sealing. Self tappers into any glass only - bad move. Not only does it tend to not have much holding power, the minute crack in the gel created as you screw in often propagates if the unit flexes.

Purely based on my own experience, no googling or recycling other peoples opinions (jw )
I don't think self tappers are designed for ply and therefore not suitable. . So it's all fine until the nobber thats installing eveything gives it too much arm and breaks the thread in the ply/glass. I believe this is known as graunching, well it is in my world!


agree that straight into GRP is utterly unacceptable
I wouldbe happy to use self tappers to hold something down that also had some Sikaflex in the join.
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Old 24 December 2007, 14:23   #29
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Having read the report it not very difficult to conclude that that is just a terrible piece of workmanship. Whoever was responsible, including the company owner should be shot. Only heaven knows what other crap is included with that make of boat. Was it made in China?

Nothing wrong with S.Tappers and urethane adhesive if done properly. In fact the only reason I would not use it is because I consider it a permenant installation.
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Old 24 December 2007, 14:35   #30
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Quote:
Originally Posted by Limey Linda View Post
Having read the report it not very difficult to conclude that that is just a terrible piece of workmanship. Whoever was responsible, including the company owner should be shot. Only heaven knows what other crap is included with that make of boat. Was it made in China?

Nothing wrong with S.Tappers and urethane adhesive if done properly. In fact the only reason I would not use it is because I consider it a permenant installation.
Steady, many top US brands now out-source to China for manufacturing and some real 'crap' is still 'made' in the US often using cheap immigrant labour, sorry 'labor'.
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