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Core material advice request

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bownarra:
I know what you guys are saying :) I have used many epoxies over the years making carbon and various other composite parts.
I've made a few hornbows with epoxy for the horn/core joint. I know it can be done but wouldn't recommend it to anyone. There are quite a few other 'issues' as well as the need to heat the bow. The simpler the bow design you are going with the more likely it is to be suitable.
By all means do whatever you feel is going to work. I learnt all this stuff by making all the mistakes haha ;) I prefer not to re-invent the wheel now :)

By the way any 'ready to use' collagen glue eg. liquid is definitely not upto the job of making hornbows. Maybe it would be ok for the splices but even then make some good stuff yourself and then see the difference. I don't recommend heat treating laminated bows of any kind.

DC:
Maybe I was reading too much into Adam's 150-160°. I just looked again and he actually said 50°c which is 122°f.

simk:

--- Quote from: bownarra on January 17, 2020, 01:13:24 pm ---By the way any 'ready to use' collagen glue eg. liquid is definitely not upto the job of making hornbows.

--- End quote ---

I dont know you nor your bows  8) But I very well know a bowyer who did dozens of scythians and other hornbows with exactly that glue  8) For me it works perfect. Did you try it?

Mesophilic:
I'm just playing devil's advocate.

Does the final draw weight make a difference on how much stress is placed on the glue line(s)?  I have no idea how neutral planes play in to limbs with such a huge range of motion.

I'm guessing here, but aren't the techniqies used designed around war bow strengths? 

As far as temp ranges go, wouldn't anything above 165°F be a moot point?  Since proteins fully coagulate at 165, wouldn't anything above that potentially cook the sinew? 

bownarra:

--- Quote from: simk on January 17, 2020, 01:43:55 pm ---
--- Quote from: bownarra on January 17, 2020, 01:13:24 pm ---By the way any 'ready to use' collagen glue eg. liquid is definitely not upto the job of making hornbows.

--- End quote ---

I dont know you nor your bows  8) But I very well know a bowyer who did dozens of scythians and other hornbows with exactly that glue  8) For me it works perfect. Did you try it?

--- End quote ---

I wouldn't know seeing as you haven't told me its particular name....:)
Do you know how liquid glues are made and how they are kept liquid. Do these processes lend themselves to producing the highest grade of glue - no, they are interested in yield and making money. Again I suggest you make your own glue then you KNOW how it has been treated
I am not hear to have pointless arguments about semantics. I am just trying to give you the benefit of my direct experience. I reserve the right to be wrong haha

A lot of this stuff will all make sense when you have made a bunch of hornbows. Theory only gets you so far. Just jump in and make one yourself and the answers to your questions will become apparent. Good luck.

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