Pressing Fiberglass/Carbon Bow Limbs

[@Vali45777]

Thank you very helpful, couldnt think about this method.

[@canusakommando9692]

I wish you would give the details. Material list, time setting, light box etc.

[@misiek2514]

I've been looking for a channel like this for a long time, you are doing a great job. Keep it up, good luck.

[@Helmbowman]

Thanks a lot!

[@clifftaylor4712]

wow! a lot of talent there my friend.

[@Helmbowman]

Thanks a lot my friend!

[@harnoordhaliwal6955]

Amazing video. Will you be making a complete bow with those limbs? I would love to watch your process

[@harnoordhaliwal6955]

Lol i found the next part.

[@Helmbowman]

Thanks a lot! I will make bow from it when i have more time 😀

[@matthewyu3531]

I have two important questions, 1) when you were making your bow/bow limbs, what brand of Epoxy adhesive did you use? 2) How to choose which brand of Epoxy adhesive should be used?

[@Helmbowman]

I used “Skresin” epoxy that was available to me, the brand does not matter, only important thing is that epoxy is thin enough so that fibers can soak it easily.

[@matthewyu3531]

@@Helmbowman Thank you.

[@ninjaman1138]

Hello, how do you avoid air bubbles in the epoxy? I made up some and when it dried I noticed lots of little bubbles in the epoxy. That sawing looked like a nightmare! The end result reminded me of horn strips? HORNBOW!!! Good work! I look forward to the seeing the bow. I am currently learning by messy mistakes haha. All the best, Simon

[@Helmbowman]

The clamping pressure pop every single bubble... hahah sawing is indeed nightmare and sanding as well! Mistakes are okay, i overbuild this limbs, now i must sand the s**t out of them 😂🤦‍♂️

[@ninjaman1138]

@@Helmbowman They look good.

[@PhongCt-u5j]

Được làm từ nguyện liệu gì thế

[@Helmbowman]

Fiberglass, carbon fiber and epoxy resin

[@lukpo1997]

I work with carbon fiber. Nice job, but i just want to give you a advise. You are using too much resin my friend, unnecesarily heavier and not the best properties at that ratio of fiber/resin. Ideally the best performance is arround 30-40% of the weight of the dry carbon added resin. Culcule of the resin is tipicallyi 1000g of resin/m2 of 1mm thick carbon. Then you can wet all the carbon on a table with a plastic and the just take the exess resin with a smooth spatula, it has to be wet but not floded with resin

[@Helmbowman]

Thank you for advise my friend!

[@sourabhd05]

Which resin n glue are ideal for this work n if it has to be heated then what wud be the write temp

[@lukpo1997]

@@sourabhd05 there are a lot of epoxy resins. I like gurit. Ampreg30 for the resin. Ampro115 for finish uv protected. Spabond 340 for adhesive. But all that is expensive, you can find other cheaper brands. In easycomposites they sell a lot of things

[@growinmoflower3391]

Very nice ✌

[@rapina3622]

Hello friend...I'm from Brazil...Do you think it would be possible to make members for crossbows such as Centerpoint Patriot 425?

[@Helmbowman]

Hi friend, i think its possible, you can also buy flat fiberglass bars from aliexpress, that would be a lot easier

[@CarlosOliveira-oo9fe]

Bom dia amigo 200grm de rezina quantas gotas de catalisador pode colocar

[@Helmbowman]

Hi, every epoxy resin is different, ratio for epoxy that i use is 100:26 by weight, and for polyester resin is usually 1-2% of catalyst

[@josegodoy9160]

Hola proba cortar la lámina con disco de cortar cerámica a baja velocidad o hacer una cortadora casera con motor de pocas revoluciones acá le decimos disco diamantado

[@Soap-jq2pg]

Can you show me how to make arms for a compound crossbow?

[@Helmbowman]

I will make video about it, if you already have cams, its similar process like this

[@Soap-jq2pg]

@@Helmbowman I don't have one, but I'll try to make one in aluminum

[@Helmbowman]

@@Soap-jq2pg Nice! Good luck!

[@Soap-jq2pg]

@@Helmbowman doing this won't be too difficult, but I don't know where to get the rest of the elements for cams

[@Helmbowman]

@@Soap-jq2pg Maybe this can help kzbin.info/www/bejne/eampepeIpNaUfKMsi=auXyc0EptQBAqakk

[@matthewyu3531]

Hi, from this video I found that you put carbon and fiberglass together. Would you kindly tell me why you don't use carbon only? Thank you.

[@Helmbowman]

Hi friend, fiberglass is nearly unbreakable while carbon is much stiffer, but can break in high stressed bow design. I like to have layer of fiberglass on bow back…Despite that carbon will not break in most cases, maybe in some highly reflex bow designs, but i like to overbuild stuff…

[@matthewyu3531]

@@Helmbowman Thank you very much for your response. Did you try to use carbon only and failed? or you just heard from somebody else? Did you test speed of these limbs?

[@Helmbowman]

@@matthewyu3531 just heard, i have only carbon limbs with no problem. I dont have chronograph but looking forward to get one

[@matthewyu3531]

@@Helmbowman Thank you very much.

[@matthewyu3531]

@@Helmbowman I found following important information from internet: "Strength. Though either material is substantially stronger than steel, industrial carbon fiber is more than 20 percent stronger than the best fiberglass. Carbon fiber boasts a strength to weight ratio roughly twice that of fiberglass" So, I think, the carbon only limbs should be better than the fiberglass limbs. Compared with fiberglass limbs, the carbon only limbs will be stronger, lighter, faster, and smoother.

[@kriselliott5866]

Where can I get that fiber material?? Very interested in giving it a try

[@Helmbowman]

Just google carbon fiber and fiberglass cloth, there are a lot places where you can buy

[@EREBO95]

Hey brother,can I ask is there an advantage to making them so thick at first then sanding them to your desired thickness? Or could you have made them thinner from the start? Thankyou!

[@Helmbowman]

Not really, here i made much thicker than i was planning to, it was my mistake, but its good to make it little bit thicker so you have room for tillering and adjustments

[@EREBO95]

@@Helmbowman thats what I thought also thanks

[@EREBO95]

Another question, did you ever keep track of how many layers of fiberglass or carbon you stacked?

[@Helmbowman]

@@EREBO95 No, but you can calculate that, for example fiberglass that weight 300g/m2 will be 0.3mm thickness, 200g/m2 will br 0.2mm and so on…

[@EREBO95]

@@Helmbowman thankyou

[@botsnaken]

Gloves??

[@ArinIsSick]

I did some fibreglass lamination, but my crossbow limb is not acting flexible

[@Helmbowman]

Did you use unidirectional fiberglass? All strands need to be laid straight and to be tight. Did your limb breaks or just dont want to bend?

[@ArinIsSick]

@@Helmbowman i did use unidirectional fiberglass and after trimming and sanding it’s bending😁 It looks like the draw strength is gonna be good too, but i tried to get the curve as accurate as i could, still it’s not perfectly curved… But thanks dude, i could send u some photos of the limb if u wanna see. U could give me ur email, if there isn’t a problem..

[@Helmbowman]

@@ArinIsSick Thats good to hear! 😀

[@gabrielghanem8253]

Amazing! In total, how many g/cm² of fiber and carbon did you use?

[@Helmbowman]

Ive used 1m2 400 g/m2 of fiberglass and 1m2 200 g/m2 of carbon, but that was overkill, next time i will use about 60 /70% of that

[@mohammadzulfahimi3416]

Nice work man 👌 do you think polyester resin would work? Or is low viscosity epoxy resin is better? In terms of flexibility and durability, i read that polyester resin have less flexural modulus than epoxy, and more proned to micro cracks, but they absorb better into the fiber strands than epoxy resin. Fyi: I really appreciate your videos, learning a lot from it 💪 thank you for sharing your work

[@Helmbowman]

Thanks a lot! Polyester will work, i think Bear and Ben Pearson uses polyester in their solid fiberglass vintage bows, and they are shootable to this day...

[@mohammadzulfahimi3416]

@@Helmbowman Cool! Going to try it then, im trying to build a full FRP bow like Grozer's and Simsek's, making the mold is tedious using plywood coated with epoxy, i think they use heated steel molding with hydraulic press for faster production, gonna be expensive tho 😂 finding a suitable resin is another thing

[@Helmbowman]

@@mohammadzulfahimi3416 Making mould is paint in the ass 😂, good luck! Keep my updated of your project

[@EREBO95]

​@@mohammadzulfahimi3416 hey how did your project go?

[@jonathanalexanderoporto9574]

Que es lo q le pone come que es trapo o pitas hilo no se q es y que clase de pegamento le esta poniendo

[@Helmbowman]

Its unidirectional fiberglss and carbon cloth, and the glue is epoxy resin

[@peterxyz3541]

What draw weight are you going for? What size is the final bow?

[@Helmbowman]

About 70 lbs, but this is overkill, i grind a lot and end up around 75 lbs, this carbon is really stiff, next time i will use much less material

[@PanzerTheTortoise]

What epoxy are you using?

[@Helmbowman]

SKresin L50-3200

[@pioneerpeters2982]

hi,could you tell me the thinning ratio about your bow limb,thanks

[@Helmbowman]

Its the 8mm in the base of the limb, and about 6 mm at the tip, but also it has taper along the width, its 30 mm at the base and 18mm at the tip

[@pioneerpeters2982]

thank you reply

[@ArinIsSick]

can i use clear epoxy resin instead of polyester resin?

[@Helmbowman]

Yes, i also use clear epoxy in this video

[@ArinIsSick]

@@Helmbowman i have another question sir, can i use fiberglass mats? With clear epoxy resin to make crossbow limbs?

[@Helmbowman]

@RestoreTheSnyderVerse Fiberglass mat have short strands that go in every direction, that is no good for bow or crossbow limbs, use unidirectional and woven fiberglass cloth instead

[@ArinIsSick]

@@Helmbowman okay so unidirectional and clear epoxy, would that work?

[@Helmbowman]

@@ArinIsSick yes, that is best option

[@vasilysh7558]

Что за материал черного цвета?

[@Helmbowman]

Its carbon fiber

[@shantamwoodworks6531]

gloves?

[@Helmbowman]

Lession learned!

[@picatchouartbraille3379]

Salut, excuse je ne parle pas l'Anglais. Je me suis lancé dans la fbrication d'arcs asiatique pour tirer à cheval. Dimention de mes arcs de 85cm à 1,10cm maximum. cela fait deux axactement que j'ai commencé. Je suis un bon manuel. Plusieurs mériers dans les misn. Mais je n'ai pas de scie circulair ; Huile de coude, lime à main et baande abrasives. et Plane. j'arrive à faire des cintrages ok a la vapeur et aussi avec des gabaris en métal. J'ai aussi en bois. Jai bien cassé 40 arcs en deux ans. Je commence actuellement à avoir de bons résultats? Arcs pour ma fille et pour trois de mes petits enfants. Question: Je reste dans des forces de 15 à 30 Lbs. dans ta vidéo, tu mélange 4 couches de fibre carbon avec 4 couche de fibre de verre. Ok , quelle épaisseur ? 100gr 20gr pour verre et carbone ? En final, tu arrive a 35 lbs pour une longueur de combien 1,25cm ? Merci pour ta réponse. Patrick Dupré de Montpellier/ France Bonne continuation.

[@Helmbowman]

merci d'avoir regardé, désolé j'utilise google translate pour cette réponse, j'ai utilisé environ 10 couches de 300g/m2 de fibre de verre et 10 couches de carbone du même poids, mon stratifié final avait environ 7 mm d'épaisseur et j'en retire 80 livres , si vous voulez un arc plus léger, utilisez moins de couches de carbone/verre, la longueur finale de l'arc est de 130 cm, espérons que cela vous aidera.

[@picatchouartbraille3379]

@@Helmbowman Ok merci. Je pense que tu arrive alors à une épaisseur de 4/5mm,? Avec une force de 40 lbs ? Pour moi, c'est trops fort. J'ai acheté des lames carbon chez Aliexpress de 500mn Pour 3mm d'épaisseur X 3cm de large. Problème, ca casse dans un petit cintrage. Je pense qu'il n'y a pas beaucoup de résine. A plus, Patrick

[@denilpt1999]

Bro make a crossbow. Limbs. Bigger one

[@sjvche7675]

I get that itchy - twitchy feeling......

[@vcommandarv5916]

Why no gloves?

[@Helmbowman]

Big mistake!

[@ArinIsSick]

@@Helmbowmancan i use clear epoxy resin instead of polyester resin?

[@GS-hg9cl]

Das Teilen zum Schluss erzeugt verschieden starke Wurfarme. Die Glasfasern waren mehr auf einer Seite verteilt.... Nich nicht ganz ausgereift diese Methode.

[@Helmbowman]

I seems, but i never had any problem with that. Thanks for watching!

[@germanictradlifewarriorarc6414]

Nice safe money

[@guinnesslover2970]

dudes never heard of a 4 inch grinder

[@CMAenergy]

Unfortunately you could have put some details . rather than just watching someone do what is natural

[@Helmbowman]

Check out my new videos about moulding bows, they have lot of details

[@egilgabrielsen5981]

you really should b using gloves

[@Helmbowman]

Thats true, really bad mistake...

[@skysurferuk]

Ever thought of gloves? Jeez!

[@Helmbowman]

I have learn the lesson 😂

[@jamesjenkins4491]

You should be wearing gloves