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Lightwind kiteboard build, planing ahead

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downunder
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Re: Lightwind kiteboard build, planing ahead

Postby downunder » Sun Sep 02, 2018 8:16 pm

fluidity wrote:
Sun Sep 02, 2018 2:24 am
phuqit- I use these: https://www.anzor.co.nz/nuts/tee-nuts

8mm thread size you can prep for with a 20mm spade bit.
I've had no failures yet.
On how many boards? ;)

This is 304 grade, we need 314 or 316 for marine environment.

I would not use those. Plus one can overscrew the bolt through the core?!

You are taking a huge risk...

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Re: Lightwind kiteboard build, planing ahead

Postby phuqit » Mon Sep 03, 2018 9:07 am

I got a few sets of those, which are SS316:
http://www.junksupply.com/product/m6-sn ... nsert-new/

But flanged nuts on both boards are holding just fine, and it's unlikely they'd get pulled any time soon, when properly seated in epoxy:
https://www.aliexpress.com/item/Flange- ... 34135.html

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Re: Lightwind kiteboard build, planing ahead

Postby downunder » Mon Sep 03, 2018 9:24 am

You are still risking a bolt going through tho...

My experience is that it's not the insert but the SS bolt quality which might be the problem.

D.

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Re: Lightwind kiteboard build, planing ahead

Postby phuqit » Mon Sep 03, 2018 9:40 am

Sure, lengths need to measured carefully, but it's not exactly rocket science. I wouldn't do this on production boards for sure, but for test samples, this works just fine.

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Re: Lightwind kiteboard build, planing ahead

Postby fluidity » Fri Sep 07, 2018 7:59 am

downunder wrote:
Sun Sep 02, 2018 8:16 pm
fluidity wrote:
Sun Sep 02, 2018 2:24 am
phuqit- I use these: https://www.anzor.co.nz/nuts/tee-nuts

8mm thread size you can prep for with a 20mm spade bit.
I've had no failures yet.
On how many boards? ;)

This is 304 grade, we need 314 or 316 for marine environment.

I would not use those. Plus one can overscrew the bolt through the core?!

You are taking a huge risk...
The T-nuts are great. They won't rotate in place because the spikes lock in to the resin as well as the wood or foam core, the top of the "T" is a wide flange which distributes the load well and there is minimal weight to them. If I used dissimilar grades of SS and had continuous immersion then over some months/years there might be issues without siliconeing in the bolts. This is real world conditions though and the kiteboard spends large portions of winter , every night and the working day out of the water. Pretty sweet life for them really... Also, I'm 100kg and so they have to keep my feet on the board. That's down to the core material and the composite sheathing which distribute the T-nut's loading over a bigger area. Only 4 boards so far but we all know the stories where the sales person says: "That's the first time we've ever seen THIS fault!!" Yeah right... Bad bolt material, wrong size or thread bolts, cross threaded bolts, all those are more likely to lead to failures.

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Re: Lightwind kiteboard build, planing ahead

Postby downunder » Fri Sep 07, 2018 9:27 am

Well, I do not agree.

If that is true, the industry would use the same inserts, but they are not.

It totally depends on how inserts are done tho. My experience with those was that Ive needed to cut the teeth and shorten the insert simply coz they are quite high. Still, the bolt can go all the way, can't be prevented I'm afraid.

So, why taking a risk is unknown to me.

D.

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Re: Lightwind kiteboard build, planing ahead

Postby phuqit » Fri Sep 07, 2018 11:21 pm

I think we're overthinking this. Pretty much any nut with at least 1mm of flange won't be pulled out from epoxy I sink it in, the only problem I see is bolt might get through the board, but it's easy to measure and safeguard against.

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Re: Lightwind kiteboard build, planing ahead

Postby downunder » Sat Sep 08, 2018 9:41 am

phuqit wrote:
Fri Sep 07, 2018 11:21 pm
I think we're overthinking this.Pretty much any nut with at least 1mm of flange woun't be pulled out from epoxy I sink it in, the only problem I see is bolt might get through the board, but it's easy to measure and safeguard against.
Very far from true, but Im also biased since selling the industry standard ones all over the World ;)

SS 304 can't last one season in salt water. That's proven even after splashing the board with tap water every time, all the time. Again, it depends on how the insert is done.
If totally embedded in epoxy, no contact with a core, than it is relaying on epoxy shear strength. That's not how production boards are done for 99% of them.

Each to his own I guess...

D.


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