Primitive Archer
Main Discussion Area => Bows => Topic started by: TBod on September 18, 2009, 03:50:24 pm
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Here's my second attempt at a pyramid or close to pyramid bow. The first broke.. It's 63" ntn 40# 28". It's from Maple (Swedish). Stringfollow is low maybe 1,5" and overnight 0,5". This particular piece is not very dense I guess it's about 45 SG, or under average at lest.
The really cool thing is that unbraced it has a serious twist and when drawn it sort of untwist. I usually get the opposite.. I tried to follow the grain when roughing out,and hence the twist when unbraced.
Pic 2 The back is covered with drying cracks. I put a layer of TB3 mixed with water on the back. The cracks closed and push out a drop a glue. Looks funny!
Pic 3 It's not really a selfbow, more of a laminate bow by accident :D. One big piece and a tiny piece of wood glued on the belly since I as always are a bit rough roughing out..
It feels really powerful shooting. But I am an extreme beginner at shooting..
Pic 1 How about that tiller, is it correct for a pyramid bow?
Thanks for looking!
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I like it. Looks great.
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Good looking bow man! I think I would actually flip the bow over and use the bottom as the top and the top as the bottom because the bottom limb looks to be bending more. Just a personal preference though... Tiller looks great! Good Work! :) -josh
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Yeah! I agree on the bottom limb. Thats the one with natural reflex, so it should be better for upper limb.
On the other hand it's close to centreshoot now and I like it. So to switch sides I'd have to fix the string alignment pretty serious..
I also try to shoot switching hands holding the bow. When I hold the bow with my right hand the bottom is up. Haven't really decide which hand works best either.
Thanks!
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you need to find your dominant eye for that...
pick an object like 10 yards away and point at it with both eyes open.
close one eye at a time and whichever eye makes your finger on the object is your dominant eye.
you wanna hold your bow in the opposite hand and use your dominant hand to draw the arrow to your nocking point (mine is beneath my cheekbone)
-hope this helps. :) josh
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Tiller looks good to me...dunno quite how a pyramid tiller should look...
I like an arc of a circle, it looks like if the tips bent a tad more you'd almost have a semi circle,(ignoring the handle of course) which is how I'd guess a pyrimid should go with every bit of the limb working?
Del
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Looks good to these untrained eyes. I've wanted to play with some pyramid designs but I'm still lost as to how the tiller should look and whether or not they should bend in the hande ???
Nice bow.
Nate Danforth
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Looks good to these untrained eyes. I've wanted to play with some pyramid designs but I'm still lost as to how the tiller should look and whether or not they should bend in the hande ???
Nice bow.
Nate Danforth
I don't think one can reasonably expect a pyramid bow to bend in the handle as it is so much narrower than the base of the limb, the change in cross section would make for a huge concentration of stress.
Just my catly guess.
Del
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Thanks Del, I've thought I've read some stuff about them bending enough to feel it in the handle and then other places saying no bend. Thanks for the clarification and sorry bout the hijack.
Nate Danforth
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If the tips were bending more, there be a problem with string angle and stack maybe?
Maybe not on my bow but it's longer than the usual for a pyramid bow.
I'll try that dominate eye thing. But I am gonna continue shooting with both hands. I got my TBB4 yesterday and it was a chapter on shooting there, good stuff I missed that about about the other ones.
Thanks!
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this one is tillered pretty good, man...
i like the dots all over the back, can you put up a clearer pic of that, please?
keep at it
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if you can learn to shoot with both hands consistently I think that would be awesome!!! I am left handed and when I first started shooting I tried to shoot both ways and since that time I have progressed to shooting all left handed (with the bow in my right hand) I really wish I would stay consistent with shooting right handed cause I can't shoot a right handed bow anymore!!! So if you can learn both and be good both ways I say go for it!!!!! :) -josh
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TBod....looks nice...I like the looks of the Natural Back of some Maples with the little Dimples in it....gives the Bow some Character! Also I am with Josh....flip the Bow....the Top Limb is Stiffer....good Job
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Ok here some more pics. Can't get it clearer than that..
The bow flipped. Maybe stiffer maybe not..
Thanks!
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Looks Better to Me.....nice job
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that method is really useful for tillering deffinately however keeping in mind that to make it work properly you'll need to make the lines on the photo to the oval you're drawing or it will throw your tiller off badly.
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Just gives you a good visual baseline to go by....just another tool to use....thats all
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It's a great tool!
It would be even better if there was a way to tilt the picture if one is not holding the bow perfectly vertical.
It would also be cool if you could superimpose one over another.
Here´s more pics. Flipped (short sleeve shirt) normal (long sleeve shirt) that one should be tilted clockwise a tiny bit. They look equally strong to me, but they bend in different ways.
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There is...you can do it with Photoshop...or HP Photosmart Premier....and I am sure others that have a Rotate Picture...in the Edit Picture Window....that is what I do to straighten them up....it lets you straighten in 1 degree increments
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I found GIMP2.6 it worked in that one two. Free download.
Thanks!
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Yeah...but I had all kinds of Problems with that one using XP....had all kinds of Trouble and had to D/L Fixes and Patches ...
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Great job and bookmarked for Sept Self Bow of the Month fun.
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Yeah...but I had all kinds of Problems with that one using XP....had all kinds of Trouble and had to D/L Fixes and Patches ...
The ellipse was a bit annoying in the GIMP, but I draw the ellipse in paint instead. I like the name of the program and you can turn the pic in 0,10 degree steps or (increments?)
I saw you had a webpage, my computer can't find it. Closed?
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Very good looking bow! The tiller looks pretty close to balanced between the two limbs...I'd let how the string tracks across the handle come into play on selecting the top limb. If you're not willing to tweak the tips over in the event of swapping the top limb, you may be better to stay with the original top limb selection from an arrow flight standpoint. :)
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Nice job,looks good to me, What Greg said on the top limb. :) That should be a nice shooter. :)
Pappy
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Yes I am with you there guys it's close call betwen the limbs in my eyes to.
Thanks!
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May I !? ;D ;D ;D
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Very well done,looks good to me,now go shoot it. :)
Pappy
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From the last pic it does look like the top limb is stiffer...there is still the question of string alignment with the handle. Isn't it almost center-shot with the stiffer limb for the top?
Options:
...reverse limbs and tweak with heat to realign the string with the handle
...weaken the top limb through removing wood, will lose draw weight this way
...cut an inch or so off the bottom limb to stiffen it up some, may gain a pound or two of draw weight
...heat treat the bottom limb ONLY, to stiffen it up? potential slight draw weight increase...haven't ever tried it on only one limb, may not make enough difference to even it up
...if it shoots good, leave it alone and shoot it as is
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Good Job Buddy!!! NIce work.
Mike
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Thanks for the response!
It's intersting and educational.
I allready tempered the bottom limb exclusive in the midlimb area to make it stiffer. It gave some effect. I've done that before just temper one limb in a specific area.
I tempered both limbs twice earlier in the tiller process.
The bow weighs 17,8 ounce, according to the Steve Gardner Mass principle in TBB4 it should weigh 17,5 ounce (if i did the calculation right). I'm happy with that!
I checked some of my earlier bows and they are about 5 ounce or more to heavy for the Mas principle..
This two pictures are best for comparing the limbs I think (lots of pics..). I tilted one to fit better with ellipse.
It's probably better to flip the bow, because you should have the more reflexed limb as upper.
I'm not gonna do that though, since the centershoot etc. And they look pretty close in strength.
Pics: first normal, second flipped
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Great looking Bow with losta of Character Im actually better at shooting than Im at making them...lol Needless to say u do fine work and the tillering is damn close to almost perfect!
CHEERS!! ;)
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Looks great! Have fun shooting. Jawge