Author Topic: 54" NTN Osge flatbow, sinew? (Read 3751 times)

razorsharptokill · « **on:** June 16, 2019, 10:16:03 AM »

Had to trim the length due to a crack at one tip and severe twist in the last 4" of the other. Ended up being 54" NTN. With the shortened length and the bullet hole mid limb, should it be sinewed? My draw is 27".

I now have the tiler closer to equal than in the last pic. Sinew then finish tillering once dry?

Pat B · « **Reply #1 on:** June 16, 2019, 01:18:13 PM »

I wouldn't worry about the knot hole in the limb. It looks pretty sound. I would suggest adding sinew. That draw length would probably be OK but sinew would make it almost for certain. Add the sinew now, reverse bracing a bit to encourage reflex when the sinew dries, correct the tiller and adjust the weight after the sinew has cured out.

razorsharptokill · « **Reply #2 on:** June 16, 2019, 02:19:55 PM »

That is what I was thinking too. Planning on hunting with it this Fall.

Pat B · « **Reply #3 on:** June 16, 2019, 04:43:08 PM »

Well, you better get started.

razorsharptokill · « **Reply #4 on:** June 17, 2019, 07:54:14 AM »

Sinew around the hole or over it? I will probably add snake skin or rawhide backing as well.

Pat B · « **Reply #5 on:** June 17, 2019, 09:27:45 AM »

I would go around the knot hole with the sinew and cut out the snake skin to emphasize the hole in the limb.

Roy from Pa · « **Reply #6 on:** June 17, 2019, 10:02:39 AM »

You cover that hole and we will ban you from the Bowyers Bench for life..

LOL

razorsharptokill · « **Reply #7 on:** June 17, 2019, 05:17:11 PM »

ok thanks guys.

Roy from Pa · « **Reply #8 on:** June 17, 2019, 05:53:51 PM »

It may make a good peep sight.

LOL

razorsharptokill · « **Reply #9 on:** June 25, 2019, 10:24:57 AM »

Sinew is on and drying now. Reverse strung it for a little reflex. Will be interesting to see what this little bow will do when it is finished... IF it survives... LOL.

I noticed a couple places that I didn't get enough glue squeezed out on the lower limb. Hope it doesn't crack and pop when I draw it. it's jelled now, I can feel a slight give to it when i press on it. Every bow teaches me something new.

There are two places where I didn't get sinew all the way to the edge. They are out near the tip on one limb.

Pat B · « **Reply #10 on:** June 25, 2019, 11:53:03 AM »

You can add more sinew now to fill the voids and maybe even be able to remove some of the excess glue. If you heat the glue slightly it should make it runny again so you can add sinew over that or remove some of the excess glue.

razorsharptokill · « **Reply #11 on:** June 25, 2019, 12:51:43 PM »

The glue is Titebond III and has been drying since Sunday the 23rd of June. Still possible?

Pat B · « **Reply #12 on:** June 25, 2019, 02:27:29 PM »

Oops, never mind.

You could still fill the voids just by adding glue and laying the sinew in that.
I also wouldn't worry about the glue popping and cracking. That is what hide glue will do if it's too thick but I doubt if the TBIII will.

razorsharptokill · « **Reply #13 on:** June 27, 2019, 10:56:16 AM »

How long to cure the sinew and glue before tillering? It feels dry to the touch with no give even in the areas I thought I had too much glue. I have it in my truck during the 90 degree days here in Oklahoma.

Pat B · « **Reply #14 on:** June 27, 2019, 12:40:33 PM »

The sinew will take longer to dry especially encased in the TBIII. The glue is acting like a vapor barrier so any moisture will have to be drawn into the wood and work it's way through that.

razorsharptokill · « **Reply #15 on:** June 27, 2019, 12:42:16 PM »

So, weeks to months before it is fully cured? When wil it be safe to string it and tiller?

Pat B · « **Reply #16 on:** June 27, 2019, 05:06:16 PM »

I've never used TBIII for sinew so I really don't know. When I build a sinew backed bow with hide glue I wait a month after each layer before I move to the next layer and a month after the last layer before stressing the bow. Others don't wait that long.

razorsharptokill · « **Reply #17 on:** July 18, 2019, 11:13:07 AM »

The 23rd of July will be a month the glue and sinew has been drying. The bow feels MUCH stiffer now.

Pat B · « **Reply #18 on:** July 18, 2019, 02:20:09 PM »

...and it will feel even stiffer on the 23rd.

razorsharptokill · « **Reply #19 on:** July 18, 2019, 05:11:50 PM »

One tip had some twist to one side that I heated and took out. It has returned. Can I heat that tip and bend it again with the sinew applied?

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Author Topic: 54" NTN Osge flatbow, sinew? (Read 3751 times)

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