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Dogbane-less Hickory shorty

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Aaron1726:
What glue are you using?  I've done 2 that I backed with dogbane and a couple others with sisal fibers and I used thinned tb3. These all adhered really well

willie:

--- Quote from: Aaron1726 on March 23, 2024, 12:40:37 am ---What glue are you using?  I've done 2 that I backed with dogbane and a couple others with sisal fibers and I used thinned tb3. These all adhered really well

--- End quote ---

how did sisal compare to dogbane with the ones you backed?

did you back with fibers to help out an iffy back or maybe apply enough to act as a load carrying lamination, like  a bamboo backing?

Aaron1726:
Willie, both seemed ok, but the dogbane is definately stronger.  Of those 4 bows I mentioned 2 have failed and 2 are still alive.  The 2 that failed were tiller issues.  The sisal bow that broke ripped right through the backing, but the dogbane one still had an intact back, just sort of folded as the wood failed.  Not extensive in comparison, but the dogbane is certainly stronger. 

These bows were backed not for performance, but rather as insurance against my rookie bow making abilities.  They were also board bows and the 2 failures were both red oak.

I started a thread about these backings a while back and there were some suggestions on sisal by Joachim using hide glue and inducing reflex with sisal as it stretches more than the dogbane would.  This might have some performance gains?  Can't say I have enough experience with it to say though. 

WhistlingBadger:

--- Quote from: Aaron1726 on March 23, 2024, 12:40:37 am ---What glue are you using?  I've done 2 that I backed with dogbane and a couple others with sisal fibers and I used thinned tb3. These all adhered really well

--- End quote ---
I'm using hide glue aka knox gelatine.


--- Quote from: willie on March 23, 2024, 06:50:13 am ---did you back with fibers to help out an iffy back or maybe apply enough to act as a load carrying lamination, like  a bamboo backing?

--- End quote ---

A little of both.  This bow is hickory heartwood, and I don't have the patience to chase rings at this point in my life, so I decided to back it.  The dogbane does seem to add some weight to the draw.  It's basically putting a couple layers of wood back on.

willie:
years a go I prepared a couple of dozen samples did some  bend testing.

as I recall, 1/2 were hide glue and 1/2 were epoxy. in each half, 1/2 again were backed with flax and 1/2 again were a synthetic backing

both backings were stronger than the wood and the more backing aplied, the earlier the sample took set.
both hide glue and epoxy performed the same at typical bow stress levels. 

In the future, I would use  a fiber stronger than wood to reinforce an iffy spot on a back.

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