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Old 04 January 2008, 02:21   #41
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agreed.

I trust self tappers with sikaflex.

I know good and bad ply and I'm also able to remember when you wouldn't buy a twisted bit of wood from a timber yard. They certainly don't make wood like they used to. Some pics would be good.

How did you fix gArfies trakta kab to your humber
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Old 04 January 2008, 11:33   #42
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Quote:
Originally Posted by Rogue Wave View Post
I know good and bad ply and I'm also able to remember when you wouldn't buy a twisted bit of wood from a timber yard.
You must be older that I thought.
Quote:
They certainly don't make wood like they used to.
It's probably cos we're more aware of what we are doing to forests and, I guess, the length of time it takes for a big mahogany or teak tree to grow. The soft textured woods will be quick growing so more sustainable...or more likely, easier whacked down with a big chainsaw in the Amazon forest.
Quote:
How did you fix gArfies trakta kab to your humber
Garfie's cab is bolted through the hull. Brackets were welded to the stainless structure early on in the build.
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Old 16 January 2008, 01:07   #43
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.Garfie's cab is bolted through the hull. Brackets were welded to the stainless structure early on in the build.
I thought it might be
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Old 28 January 2008, 15:59   #44
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Originally Posted by Rogue Wave View Post
I know good and bad ply and I'm also able to remember when you wouldn't buy a twisted bit of wood from a timber yard. They certainly don't make wood like they used to.

Some pics would be good.
I've finally got around to it. A comparison of what I consider to be pretty good quality marine ply and some ply cut from my Humber a few years ago. Most of the commonly available marine ply is like the Humber ply. There's a wee test in the next post.
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Old 28 January 2008, 16:02   #45
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How thick? 1"?
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Old 28 January 2008, 16:10   #46
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OK, for the self tapper doubters, here's proof of the effectiveness of selftappers. These are just 15mm long and fairly narrow gauge. The anvil is 1½cwt. The wood is an offcut from my transom which has been out in all weathers for 4 years and it's boggin wet but still OK.
The screws are nowhere near at their limit.
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I trust self tappers with sikaflex.
Stu, no sika required.
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Old 28 January 2008, 16:15   #47
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How thick? 1"?
Aye, I think it is. I'll go and measure it if you need to know.
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Old 28 January 2008, 16:23   #48
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Nah, I was just counting the plies and comparing to the stuff I got from Robbins (since I was waxying lyrical about them in an earlier post)
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Old 28 January 2008, 16:28   #49
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..(since I was waxying lyrical about them in an earlier post)
Ok. Are you happy with that ply? What did it cost you for and 8x4?
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Old 28 January 2008, 16:34   #50
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I got half a sheet of 1" Super Elite - and yeh, have been pleased with the quality. Prices, plies etc posted here:
http://www.robbins.co.uk/Pdf%20Files...plywoods_1.pdf
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Old 28 January 2008, 17:01   #51
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Old 28 January 2008, 17:18   #52
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Jumping back to the screws for a minute, here's a couple of websites that will hopefully explain the the technology of "Thread forming" (to give them their proper name) screws. Self tappers are strictly a whole different ball game.....

http://www.emhart.com/products/pk/swage.asp
gives a pretty picture

http://www.theengineer.co.uk/Article...+fastening.htm
is more verbal, but gives you the picture.

Long & short of it is there's thread forms, and there's thread forms. What sticks like lue to plastic or metal may pull straight out of wood & vice versa.

I'l lleave you guys to carry on talking about the wood now.....
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