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Author Topic: How to tiller a banana bow  (Read 3543 times)

Offline cooter

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How to tiller a banana bow
« on: February 08, 2004, 01:20:00 PM »


Here's pic #1. If you can see the measurement on the tape its reading roughly 13-1/4 inches of reflex. A little more than I wanted to tackle. If someone told me sinew is capable of adding another 5 inches of reflex to a bow I'd have thought they were nuts. Not any more.
what you lack in ability make up for with enthusiasm

Offline '46

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Re: How to tiller a banana bow
« Reply #1 on: February 08, 2004, 01:27:00 PM »
Cooter, I've never had the pleasure of making a bow out of bannana  :D  

Mannnn...it looks like the sinew stuck this time , huh?  :thumbsup:
George
_------------->

Offline cooter

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Re: How to tiller a banana bow
« Reply #2 on: February 08, 2004, 01:38:00 PM »


Here's pic #2. I'll be floor tillering this bow for a while I think . This is a picture of the upper limb flexing. My main goal is to get both limbs to straighten out for me. The top limb is looking good, but the lower limb need some scraping yet. Once I get  the lower limb to come straight for me I think the trick will be to get the limbs to turn. Then once the limbs have turned I have a sneeking suspission I shouldn't need to do a lot of scraping to bring the bow to final tiller. I guess we'll see.

Any advice as to how I should proceed would be greatly apreciated. After all I am flying blind with this one   :bigsmyl:  

Marc,

If you have any pics of your banana bow please do so.

Thanks,
Cooter
what you lack in ability make up for with enthusiasm

Offline Madpigslayer

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Re: How to tiller a banana bow
« Reply #3 on: February 08, 2004, 01:42:00 PM »
Cooter, that second pic put a big ole smile on my face!!!! ON THE CARPET!!!! I am gonna show "her" that picture when she gets home!!!

I will be watching this thread...all the way to the end  :D  

My friend, I wish you all the luck in the world.  :)
...gosh this is hard.

Hailey (5) 3 minutes into a pilates workout

Offline ks chas

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Re: How to tiller a banana bow
« Reply #4 on: February 08, 2004, 02:55:00 PM »
Cooter I started one of those things 3 years ago at MOJAM. It still isnt finished.If you think floor tillering is a trick wait until you try to put a string on the thing and put it on a tree. GOOD LUCK Im watching to see how you get along  ;)

Online George Tsoukalas

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Re: How to tiller a banana bow
« Reply #5 on: February 08, 2004, 03:16:00 PM »
OMG, Cooter. Hope you are using a rope and pulley.
Jawge

Offline Bob Barnes

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Re: How to tiller a banana bow
« Reply #6 on: February 08, 2004, 03:27:00 PM »
way cool Cooter...you can do it.  Heck Marc's bows look like that AFTER they are tillered...  :)
Bob
"Hello, My name is Bob and I'm a BowAholic"

Offline cooter

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Re: How to tiller a banana bow
« Reply #7 on: February 08, 2004, 03:53:00 PM »


Here's a pic after I worked on that lower limb some. Getting closer, I'm holding the top limb and try to keep equal pressure on both limbs when I'm floor tillering this thing. From the pic it almost looks as if the top limb is starting to turn while the bottom isn't quite there yet. I can't beleive my son snuck into that pic like he did. I never saw him and am sure glad the bow didn't decide to go south right then and there. As a fly by the seat of my pants bowyer, she's not looking too bad for right now, but I've only been at it for a day so there is still plenty of time for something to happen that I'm not going to like.  :bigsmyl:

George, I'll give you a call later, We still on for next weekend? We're planning to come up Friday and go home Sunday.

Cooter
what you lack in ability make up for with enthusiasm

Offline Ralph Renfro

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Re: How to tiller a banana bow
« Reply #8 on: February 08, 2004, 04:32:00 PM »
Cooter, you could always cut it into in the middle of the handle and use each limb for a rocker and just build that boy a rockin chair.
You are a work of art my man. You and that dang sinew are book worthy. INCREDIBLE!! KsBow  :bigsmyl:
Building Bows Is Only Half The Fun, The Other Half Is Passing That Knowledge On!

Offline the Ferret

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Re: How to tiller a banana bow
« Reply #9 on: February 08, 2004, 05:12:00 PM »
OMG Cooter that thing is WILD! Like Ralph said wait until you try and string that sucker and get her on the tree. I call them rodeo bows...get a string on her and see if you can hold her for 8 seconds without it turning inside out.   "[tunglaff]"  

I showed Dianne the pics and she just keeps mumbling about the carpet..something like "I'd kill him" ha ha

Course I tracked quite a bit of yeller onto our carpet this weekend myself

Here's a trick Marc tought me about checking the limbs bending on a bow like that (over 6" of reflex). Put the bow horizontally in a padded vice, back towards you, then you can push on the limb tips (one at a time) to see how each limb is bending.
There is always someone that knows more than you, and someone that knows less than you, so you can always learn and you can always teach

Offline Timo

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Re: How to tiller a banana bow
« Reply #10 on: February 08, 2004, 06:17:00 PM »
Cooter, Cotter, Cotter.That thing is wild!  :scared:  

You don't knapp rocks on that carpet, do you?
(Enny o yuns know ware thu heart o a stumpytail izz??)

Offline AZStickman

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Re: How to tiller a banana bow
« Reply #11 on: February 08, 2004, 06:33:00 PM »
Cooter that's like having to tiller a bow twice..... Once to get it to where ya have it and once more to get her shooting.....  :D  .... Nice job so far..... Terry
"The reward of a thing well done is to have done it.".. Ralph Waldo Emerson

Offline cooter

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Re: How to tiller a banana bow
« Reply #12 on: February 08, 2004, 07:36:00 PM »
Tomo,

Not exactly on the carpet, we got a tile floor in part of the basement that I knap on. Besides, thats what tarps are for and I sure as heck aint going go knapp outside this time of year in Minnesota   :scared:  

 

Now for the banana bow, I put it on my tillering tree and jury rigged a harness to set bricks on to see how things are bending. I'll get a pic up later. two things I found out. First is that bottom limb is stiffer than the top and is twisting twords me when looking at the bow on the tree. Now not only do I need to think about taking some weight off that lower limb but where exacty I want to remove that weight from the limb. This bow is definitely going to be a challenge.

Cooter
what you lack in ability make up for with enthusiasm

Offline Madpigslayer

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Re: How to tiller a banana bow
« Reply #13 on: February 08, 2004, 07:39:00 PM »
Cooter, I like you already.  :D  

this is gonna be fun. You might wanna consider some kind of "protection" if you know what I mean....haha.
...gosh this is hard.

Hailey (5) 3 minutes into a pilates workout

Offline lcoast

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Re: How to tiller a banana bow
« Reply #14 on: February 08, 2004, 07:58:00 PM »
Cooter you and the comments you are generating from the audience are scaring me. I got a couple of staves that look very similar and they ain't got no sinew on them. One is twisted and the other is bent back perfectly. Sure hope this works for you. I need some confidence generated now.   :)


=keith=
=keith=

Busted chairs and broken dreams.

Offline gifford

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Re: How to tiller a banana bow
« Reply #15 on: February 08, 2004, 08:21:00 PM »
cooter, this is going to be a great build along, I shall be following this one. If you do put it on the tree, I would suggest a padded c-clamp to keep it there. It is going to want to flip. The tip Mickey gave was a good one for initial flexing.

Offline Ralph Renfro

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Re: How to tiller a banana bow
« Reply #16 on: February 08, 2004, 09:48:00 PM »
Cooter, it's apparent that you're suffering from Sinewitis. I've hear that it affects you physically and emotionally. Only cure is to finally get one shootable bow with sinew on the back. The a feeling of euphoria will set in and you won't feel the need to devote so much time and effort into you sinew projects. Good Luck Buddy!
Building Bows Is Only Half The Fun, The Other Half Is Passing That Knowledge On!

Offline cooter

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Re: How to tiller a banana bow
« Reply #17 on: February 08, 2004, 10:13:00 PM »
Mickey,

I had to read your post about a half dozen times before actually figuring out what you were talking about. That is a good idea, thanks.

AZstickman,

You are correct, well, in a way. My first tillering goal was to get the limbs bending to give me a flat profile and I think I'm there.  Now I'm shooting for the turning point, then comes the magic to 18 inch draw length and working on getting her to brace height, then final tillering to draw length/ weight.

For now I got to consider limb twist/tip twist on that lower limb. I did some scraping on her tonight trying to remove wood from the strong side of this lower limb and now it's looser than the top limb but the twist is still there. Now I'm debating if I want to continue scraping the stong side of that limb to see if I can get ride of it's desire to twist or add some sinew to strengthen that area of the bow to eliminate the twist. I guess I do have a third option and thats to sand some sinew of the back side of the limb on the side opposite the direction the twist wants to go? Anyone have some advice on how I should handle that tip twisting.

As promised here is the contraption I'm using to look at how the limbs are bending relative to an applied known weight. Total weight applied is 22 lbs. The lower limb moved maybe 2 inches while the upper limb moved maybe an inch. What I do like about the set up is you can bounce the bricks slightly to watch how the limbs move relative to each other.

BTW, This bow does kick like a mule and has now officially now drawn blood  :mad:  First time on the tillering tree to boot but don't worry the bow is fine  :bigsmyl:  

 

Thanks for all the support and please by all means if you've got any advice, please give it, I think hack might need all the help he can get on this one.

Thanks,
Cooter
what you lack in ability make up for with enthusiasm

Offline rocdoc

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Re: How to tiller a banana bow
« Reply #18 on: February 08, 2004, 10:18:00 PM »
Cooter.....ain't ya gonna curve them tips any to give that wimpy stave a little kick?  ;-)

BTW....how long you been outta the institution??  Hope you buy some more life insurance 'fore you start stringin' that thing!
"The crappy stuff makes you a better bowyer, but the good stuff makes better bows"....Ferret

Offline Chris R

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Re: How to tiller a banana bow
« Reply #19 on: February 08, 2004, 11:23:00 PM »
Cooter, this is beautiful  :thumbsup:   I'm loving it  :thumbsup:    :thumbsup:  .  

On the limb that's twisting toward you, is the sinew thicker on one side of the limb than the other?  If so, it will want to twist toward the weak side.  Also, on the stronger limb, how's the wood look compared to the other?  If I remember from one of your earlier threads, you've got a boat load of sinew on that puppy.  You might want to consider filing the sinew a little to get the tiller more even.

I've never tried it, but this is one bow you might want to consider two sets of nocks on, one for the string, and one for a long string to brace it.

Good luck!! we'll all be watchin  :thumbsup:  

Chris
DAN!(Defeat Autism Now!)

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