Author Topic: Tillering advice: This thing is kinkier than...  (Read 2510 times)

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Offline WhistlingBadger

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Re: Tillering advice: This thing is kinkier than...
« Reply #30 on: January 17, 2026, 01:07:34 pm »
Give it plenty of time to loose the added weight. The snake skin is like a vapor barrier so the moisture has to go into the wood then dissipate  from there.

...and juniper seems to take longer than hickory for this, probably because it is so resinous.  It actually kept a steady weight for almost a week before it started losing weight.  The only indication I had to excess moisture was the loss of reflex.  If I had started pulling it too soon I probably would have ruined it, or at least lost a lot of power.  Something to remember for the future.
Thomas
Lander, Wyoming
Arise!  Kill, and eat!

Offline JW_Halverson

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Re: Tillering advice: This thing is kinkier than...
« Reply #31 on: Today at 11:34:39 am »
So many people have poo-poo'd me over the years when I tell them to go slow waiting to get the last of this added moisture back out of the finished bow. Some of them should have known better because they arent new to making bows.

I was an acolyte of the "Sinew Everything Cult" when I was new to making bows. I'd get the sinew dried for a week or two and then go to finish tillering. A few months later the tiller would be all out of whack and I'd have to re-tiller all over again, resulting in a lower than desired draw weight. Someone in here told me to wait longer, so I waited about 6 weeks after sinewing. Not much of a better result, I still needed to retiller yet again about 5-6 months later. Eventually my thick skull wore a hole from running into the same brick wall over and over again and I started leaving a sinewed bow to cure for at least 6 months. Whenever possible, I lay the bow out in the sun on warm days to speed the process, sometimes storing it in vehicle parked in the sun to mimic a heat box. I cannot imagine how much longer a proper curing out would take living in a more humid climate!
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Offline superdav95

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Re: Tillering advice: This thing is kinkier than...
« Reply #32 on: Today at 03:34:56 pm »
So many people have poo-poo'd me over the years when I tell them to go slow waiting to get the last of this added moisture back out of the finished bow. Some of them should have known better because they arent new to making bows.

I was an acolyte of the "Sinew Everything Cult" when I was new to making bows. I'd get the sinew dried for a week or two and then go to finish tillering. A few months later the tiller would be all out of whack and I'd have to re-tiller all over again, resulting in a lower than desired draw weight. Someone in here told me to wait longer, so I waited about 6 weeks after sinewing. Not much of a better result, I still needed to retiller yet again about 5-6 months later. Eventually my thick skull wore a hole from running into the same brick wall over and over again and I started leaving a sinewed bow to cure for at least 6 months. Whenever possible, I lay the bow out in the sun on warm days to speed the process, sometimes storing it in vehicle parked in the sun to mimic a heat box. I cannot imagine how much longer a proper curing out would take living in a more humid climate!

so glad you said this!   Ive noticed this as well.  I use the tried and true method of monitoring weight loss over an extended time indoors in an air conditioned environment. measuring mass loss is a good method and safe.  once i get to the point where the bow stops loosing and fluctuates by gaining in the very slightest and lossing again i know im very close.    this is how I eventually realized that this is a very long process and cannot be rushed safely.  sure Ive put bows into a hot box/warm box for a few days which helps but it still takes longer to get deeper moisture out of a finished vapor barriered bow.  I think i would also agree with 6 months as a minimum is a safe rule of thumb on sinewed bows.  you may see faster times in really dry climates.  I am monitoring the weight on a bow now that i recently finished up and it is still loosing mass after reintroducing moisture to the sinew for finished covering.  I know that if I were to string it up now i risk seeing what appears to be an uneven tiller and wanting to change or correct it.   
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Online bjrogg

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Re: Tillering advice: This thing is kinkier than...
« Reply #33 on: Today at 04:46:08 pm »
Yes moisture is definitely sinews kryptonite . It can really soak it up and once you cover it with a waterproof seal, the only way it can dry is very slowly.

I don’t like bending one without sinew for a couple weeks after applying snake skins.

Bjrogg
A hot cup of coffee and a beautiful sunrise