Author Topic: Sinew Backed, Double Curve Bow  (Read 92477 times)

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Offline Woodland Roamer

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Re: Double Curve Bow Build Along (with pics)
« Reply #30 on: September 25, 2008, 11:31:53 am »
Nice thread and bows. I've wanted to make one of these for a while. Last weekend I roughed out three staves, two osage and one hickory. Looking foward to seeing more progress.

Alan
Alan Shook-Taylorsville NC

Bring back the Stone Age!

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #31 on: September 25, 2008, 11:34:47 am »
Postman....yep, the 3 under works fine for me....but I've got small fingers. ;D  The Sioux grip is my favorite (and I'm so accustomed to it that any other grip feels wrong) but any grip that is comfortable and effective for the archer is the "correct" grip in any case.

The 47" bow pulls 45# @22".  On the new bow I'm planning on a cruising speed of 55# @22" with a max speed of 60# @24".
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #32 on: September 25, 2008, 11:37:27 am »
This weekend I'll be working on the new bow.  I plan to apply the sinew and begin working on the bowstring.
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #33 on: September 26, 2008, 12:49:41 am »
I took some pictures of some trouble spots on the back of the new bow.

The first two pics show a natural concave area between two "lumps". I sanded down these lumps and violated the rings quite a bit.  (This can be done with juniper as long as the back is well sinewed and the main body of the bow is sound). The concave area will be filled with two (maybe three) layers of sinew in order to compensate for the weak spot and to bring the surface level with the back of the bow.

I also sanded the small knots down flat and smoothed down the rest of the back without worrying about violating a ring or two.  The ideal situation would be to use the wood just under the bark for the back of the bow, like with hickory, but a perfect juniper stave is a VERY rare commodity. The older bow's back was shaped in this fashion as well.

Ishi decrowned his juniper staves and violated growth rings quite drastically in order to create a wide, level, smooth surface for the sinew.   I have not gone to that extreme with my bows (yet). ;D

Before I apply the sinew over the knots on the edges of the bow's back, I will round off the sharp edge and apply extra sinew over the knots.  There's a total of four knots on the back that are larger than 1/8" in diameter...two are on edges.

(As a side note:  I've got two other juniper bows in the works with backs that are knot free and have not been violated.....but what's the fun in doing a build along with one of those?  They're too easy. :P)


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« Last Edit: October 02, 2008, 02:25:19 pm by jackcrafty »
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #34 on: September 27, 2008, 03:37:25 pm »
Sinew is drying, so I got some time to post pics.

1. OK.  The first pic shows the low spot that I will fill with sinew (side view).
2. Next pic shows the sinew I'll be using:  Thick, short strands...well pounded...not stiff.
3. Next is the jute twine I use to wrap the sinew.
4. Fish glue.
5. Dabbing glue on finger.
6. Applying base coat of glue to wood.



[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #35 on: September 27, 2008, 03:42:51 pm »
1. Sinew before dunking.
2. Sinew after dunking.  I do not soak the sinew.
3. Laying the sinew on a dry towel.
4. Pouring out some glue into cup.
5. Cutting sinew into small pieces.
6. Dipping sinew in glue.

(The whole build along won't be like this...I'll pick up the pace as we progress) ;D

[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #36 on: September 27, 2008, 03:52:13 pm »
1. Applying sinew pieces.
2. Wiping fingers on wet towel.
3. Beginning jute wrap.
4. More wrapping (light pressure).
5. Excess glue being pushed out ahead of wrap.  This can be wiped off. (sorry for blurry pic)
6. Finished wrap.

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« Last Edit: September 27, 2008, 04:02:47 pm by jackcrafty »
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: Double Curve Bow Build Along (with pics)
« Reply #37 on: September 27, 2008, 04:01:32 pm »
1. Carefully removing wrap after waiting 5 minutes.
2. Wrap removed.
3. Smoothing the patch (there will be jute fibers left behind). A few drops of water.
4. Side view of patch.
5. Second wrap after waiting 5 minutes (medium pressure).
6. Finished wrap.  Let dry a few hours before next course.



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« Last Edit: September 27, 2008, 04:05:50 pm by jackcrafty »
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #38 on: September 27, 2008, 11:25:18 pm »
Rounding off sharp edges of bow's back and wiping down with damp cloth.

[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #39 on: September 27, 2008, 11:35:39 pm »
After sizing the back with glue.....applying first strands of sinew to middle center of bow's back.  The ends are pinched to form a point.

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« Last Edit: October 11, 2008, 05:41:49 pm by jackcrafty »
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #40 on: September 27, 2008, 11:39:01 pm »
Adding more strands....first to the bottom left, and then to the bottom right....overlapped slightly past bow centerline.

[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #41 on: September 27, 2008, 11:42:01 pm »
Continue adding strands.....pushing them together.

[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #42 on: September 27, 2008, 11:46:44 pm »
Continue until the sinew "points" reach both ends of the bow.

Almost there...losing daylight.  First pic shows right limb with patch (from earlier) almost covered with sinew.  Last pic shows finished left limb.  Now the sinew (entire bow) will be wrapped with twine.  More pics tomorrow (during daylight). ;D

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« Last Edit: September 28, 2008, 04:27:32 am by jackcrafty »
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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  • Sorry Officer, I was just gathering "materials".
Re: Double Curve Bow Build Along (with pics)
« Reply #43 on: September 29, 2008, 02:10:43 am »
The new bow wrapped with jute twine....it was wrapped once to squeeze out excess glue (light pressure) then unwrapped and wrapped again with heavy pressure.

Also two other bows I'm working on.  They were wrapped with polypropylene twine and let dry for a few days, unwrapped and let dry for another few days.  They should be ready for tillering soon (in about a week).  The sinew has been coated with more glue...that's why they look glossy.

[attachment deleted by admin]
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline donnieonetrack

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Re: Double Curve Bow Build Along (with pics)
« Reply #44 on: September 29, 2008, 03:43:39 pm »
Patrick, you said "fish glue", did you make it or buy it?  Also, do you apply it hot or cold?

great build-a-long,

Donnie
Donnie Wilkerson
Gainesville, Florida