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For discussions related to ski/snowboard construction/design methods and techniques.

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MontuckyMadman
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Post by MontuckyMadman »

Damon wrote:
MontuckyMadman wrote: Prepreg is relevant to the carbon layup I think.
Right, I'm not sure the presses used in industry can cure prepreg.
why? I think they just wet and put in a cooler and then layup later. Could be wet or already cured and they abraid and bond.

At high temps you cant bond a prepreg in a ski press?
Damon
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Post by Damon »

Most the prepreg I've seen cures around 300F. I've seen lower temp curing prepreg, but the cycle times are much longer.

Precured I could see being used though.
knightsofnii
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Post by knightsofnii »

they make prepregs that work at our temps, you have to keep them cool so they dont kick.

You might be thinking of thermoplastic prepregs? those require upwards of 500 degrees
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brewster
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Post by brewster »

I would think you would be fine with the AL in the planer. I cut 6061 square tube with a $15 plywood blade on my miter saw. After 100+ cuts it still does a great job on wood. However, the blades for your planer could be a bit more expensive of an experiment.

I have also nicked AL I was using as a fence with my router and it shreds the AL. Aluminum is soft. I say, plane away.
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MontuckyMadman
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Post by MontuckyMadman »

OK. so finding small amounts of titanal looks like it would be difficult.

Would I be able to rip it out of another ski and reuse it? Probably difficult to clean up enough or get out in one piece.

Whats is the closest type of AL alloy that I could find in this type of thickness?

It must be an aerospace sourced metal. Lots of aerospace in the US.
Is this a 7000 series AL?

What would be the metal/composites/aerospace supplier I would contact to buy this type of material in small qty?
I don't really know what thickness this material should be applied in or what it is available in.
Titanal appears very brittle so what alloy is smiler?

What about vertically laminating fiberglass in with the wood core?

Would this provide dampening characteristics?


I imagine getting even pressure would be difficult with out a nice core laminating machine thing.

I just want to play with this idea.
doughboyshredder
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Post by doughboyshredder »

That would be a fun one to mess around with. I would imagine you could use a thinner core with vertical reinforcements.

Titanal is just a brand name for this stuff: http://www.amag.at/AMAG-Titanal-R.1193.0.html?&L=0

Which I believe is just an aluminum alloy, with a special coating for bonding.[/url]
Drew
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Post by Drew »

This idea has been used by one of the major manufacturers (Fischer). It was/is called I-Beam tech and they do basically the same thing as dps but with carbon fiber which seems to make more sense for of workability.

Also I have a limited understanding of engineering because I am in high school but it also seems to me that metal would bow out before bending on that axis, I'm not sure.
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MontuckyMadman
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Post by MontuckyMadman »

yeah seen the amag stuff. I think 7075 T6 aero space alloy would work but I would have to etch/chemlock it to bond.

Looks like onlinemetals has it.

http://www.onlinemetals.com/merchant.cf ... &top_cat=0

The real question is whether or not .8mm is to thick??

Carbon in that type of application would provide very different characteristics. While definitely stiffening the core, I don't think any dampening would happen and that is what I am looking for.

I want to build a light yet damp ski.
doughboyshredder
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Post by doughboyshredder »

That is really thick.

I have some .8 that I use for shims on my profiler. Thick, thick, thick. I bet you would want something more in the .2-.3 range. But IDK
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Post by sammer »

I've used generic aluminum sheet in skis as binding mount reinforcement.
Not sure what alloy, but the first stuff I bought was quite thick .025"
It's fairly heavy.
Doesn't make it any lighter that I put a layer of vds above and below.
The ski is definitely damp though!!
The latest stuff I bought is .0125" .
I think that would be about as thick as I would want to go if I was doing the whole ski length.
Aluminum seems to bond well but needs to be sanded (60 or 80 grit) and washed with acetone immediately before layup as it oxidizes very quickly.

sam
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MontuckyMadman
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Post by MontuckyMadman »

OK where the hell do I find .3mm high tensile aerospace al alloy in the US?

maybe here?
http://www.aerospacemetals.com/aluminum.html
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MontuckyMadman
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Post by MontuckyMadman »

So what thickness?
.2mm or .3mm?
AKA .008" or .125"?
doughboyshredder
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Post by doughboyshredder »

.3 is 50% stiffer than .2, so I would test it.
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