Carbon twill

[Crooked Stic]

The Rosewood Shop. And it is layed up in a big square or rectangle and cut at 45. So the manufacture has some waste to deal with.

[Longcruise]

The Rosewood Shop. And it is layed up in a big square or rectangle and cut at 45. So the manufacture has some waste to deal with.

 

[Mad Max]

Show us what you are working on?
Your using it for limb twist ?
Bid recurve?

[Flem]

45/45 is the weave of the twill. Those pre-made flat panels are either laid up wet and vacuum pressed or vacuum infused on a flat smooth surface. The weight of the fabric determines the amount of resin it will consume and the ultimate thickness. The rough side could be post finishing, but it is most likely from the release fabric (peel ply)
which allows the excess resin to be drawn away and leaves a textured finish for post bonding.

Stic, I am curious why you say it was cut at 45deg?

[Crooked Stic]

Flem because the ends of the strips I got were not trimmed and still had the 45 on them.

[Flem]

 

[Mark R]

I think I've done 5 or 6 bows using it only on the back instead of glass,  I could get it from a few different bowyers years ago, and they were not all made up the same, but all worked out well, torsional ability was better on some versus others, and all are pretty quick.

[Flem]

Call me obsessive, but I was still having a hard time wrapping my head around the angle thing. So I got out my box of reinforcements for visual confirmation. Here it is; 45/45deg fabric cut at 45deg, becomes 0/90deg. Plain weave twill, 0/90deg, cut at 45deg, becomes 45/45deg.

[Mark R]

I think so Flem, I do not know the specifics on the lay up as far as layers used and how there oriented, but I did try some that was not made specifically for bows at the 90 degree that was twill woven and it broke across at a 90 degree  and the other is a low poundage bow that is nothing special and am not shooting it, don't think it will hold up, I should just toss it. I think the 90 degree is not as strong as the 45 degree jmho. I made a recurve using uni carbon under the 45/45 weave carbon with a bamboo core that's a real screamer, and some with foam core's that are sweat shooters, I'm gonna mess with it more in the future to see what design and layup seems best. I must say I've only used it as backing instead of glass. It does cost more than glass you'll have to justify for yourself if it's worth it but I'm all about making good better if I can just because I enjoy it, like alot of guys here I'm not really making bows to sell, just for my on pleasure, maybe a couple a year, if some one wants one that I will part with all the better. 

[Crooked Stic]

Okay the twill does nothing for stiffness. Or making the limb have more draw weight. Got to have uni for that. The less mass weight of the carbon vs. core may gain you some performace. And the fact you can go more aggressive on design. And be able to profile the tip to have more taper and even more forward taper and still keep them pulling straight.

[Flem]

Stic, I think Mark was saying that your twill, cut at 45deg should be strong and fast.

[Mark R]

What Flem said.

[Crooked Stic]

Ima fix in to lay one limb up in the AM.   

[Mark R]

This conversation has helped me think about another recipe to use on my next bow, more than likely next spring when the garage is a little warmer, thank s all for the input, what a great web site. Stic let us know how it turns out

[Crooked Stic]

I got both limbs yesterday glued. So tomorrow I can get close to seeing what I have.

[jess stuart]

Tomorrow. Turn the lights on and burn the midnight oil we need to know. 

[Mad Max]

I got both limbs yesterday glued. So tomorrow I can get close to seeing what I have.

 

[Crooked Stic]

The tip overlays curing and will be ready to work with today. I can tell you after profiling the tip tapers and a two handed grasp no twist at all.

[Shredd]

 

  Chubby Checker would be pissed...   

[Crooked Stic]