Primitive Archer
Main Discussion Area => Bows => Topic started by: armymedic.2 on February 06, 2008, 07:55:46 pm
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bending 19 inches @ 50lbs which is my target. tell me what ya think --ipe backed with bamboo, mahogony handle-68"long
(http://i124.photobucket.com/albums/p38/armymedic2/20080206_1.jpg)
(http://i124.photobucket.com/albums/p38/armymedic2/20080206_3.jpg)
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Looks good, but as you go don't remove any more from the fades and the wood near the handle. More from the midlimb toward the tips. Give it a nice, veenn, elliptical tiller.
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Looks good, but as you go don't remove any more from the fades and the wood near the handle. More from the midlimb toward the tips. Give it a nice, veenn, elliptical tiller.
Took the words out of my mouth. :)
Sean
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How wide is it at widest point. How wide are tips ? Some pics would help .......bob
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19 inches? Time to get her on the short string and to brace height. You will better be able to see the actual tiller at that point. Right now it is going to be bending more at the fades than it will when you switch. This could trick you into removing more wood at the tips causing the thing to be whip tillered.
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If You can't easily push/pull string it then I wouldn't pull it this far on a loose string. The tiller will look different when strung. I would still be floor tillering the bow at this point. I think the limbs are a bit too thick, and may need to be rounded a bit on the belly side as well..
But like Bob said, some dimensions, and a unbraced and profile pics can only help us help you..On your bow 1" wide outside the grip and 1/2" thick limbs including the bamboo is more than enough wood for 50#'s on a straight bow...
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bob, there are pics......ok, i will remove from middle and out. sounds good. i have it braced at 1 inch right now, so it is on a short string so to speak. just a little shorter and i would have my full brace. goods good...i thought i was seeing a flat spot out on right limb about 3/4 to tips, and maybe a hinge toward the handle on right limb, but maybe i have just stared at it too long since noone mentioned it. ill post differnet pics tomorrow and demensions. thanks guys.
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Medic, I think I see the spot that you think it is hinged, I think it looks that way because of the light reflecting off of the background at that spot.
Dale.
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medic, I think Bob wanted to see pictures of the back of the bow so he could get an idea on the layout of the bow. An unbraced picture also. If this bow has reflex in the limbs beyond the fades the tiller could be on. We are not trying to get a perfect arc all the time. We are trying to get the entire limb working the right amount. A reflex deflex looks like the limbs are straight from midlimb to tips at full draw, even though they are bending a lot. Nobody can tell you if that tiller is correct without knowing what the limbs look like relaxed. Justin
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use a 6" straight edge on the belly while its braced, this will show you any weak or strong spots.
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Make yourself a tillering gizmo. It will tell you every place you need to remove wood.
Here is how to make one.
http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=2;t=000075
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Hey, medic
Get it to brace asap, and then go from there. Looks like you've got it far enough to brace. So far, it looks really good.
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Get it to brace....I said it once several posts up and stand by what I said. You want to get a real picture of the emerging tiller which you cannot effectively do with a long string
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Tillering gizmos are only effective if you are tillering a perfectly circular arc. Without seeing the relaxed profile or knowing if it has parallel limbs we don't know if that is the correct tiller. ??? Justin
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Justin, same thing i was thinking. I do like the idea of a tillering gizmo and it got me thinking about using a soft tip on one that would draw a thick lne where it was heavy contact and a thin line where it was light contact, Then you could use it for elyptical as well as full arc. Steve
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tonight i will get it to brace, and move from there, i understand what you mean. it is a stright bow, with no r/d or recurve. it will not bend in the handle. i have used the tillering gizmo before with great results, but am having a hard time getting even white pencil to show well on the limbs, so i am using a 6 inch straight edge and my eye, like what was stated above. I am at the office so i can't measure her now, ....but i do have the belly rounded about a third of the way on each side, with the center 1/3 of the belly flat from me scraping. i like the flat bows and am only rounding the edges to keep from having a place for a splinter to lift. this bow is for my dad, his first anythign but a racurve, so i really appreciate the help you guys are gioving me so it comes out nice. ill be in iraq starting may or so, so this is my last chance to get him something real to hunt with before i go. im a slow worker, and have been fiddling with it for 2 months already, now im at the scary part :} ill post more pics ansd such tiongiht. thanks again for all of you comments
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okay, so the bow is 1 inch wide at the fades, 1/2 inch at the knocks. It is 68 inches ntn-you see it drawing 20 inches here, and she is good and braced like she should be. she needs to get to 28. she is 50 lbs at 20, and i need her there at 28 there is no bend heated into it, but it appears to be taking a slight set :-[ hope these are enough pics to give you an idea
(http://i124.photobucket.com/albums/p38/armymedic2/20080207_1.jpg)
(http://i124.photobucket.com/albums/p38/armymedic2/20080207_2.jpg)
(http://i124.photobucket.com/albums/p38/armymedic2/20080207_4.jpg)
(http://i124.photobucket.com/albums/p38/armymedic2/20080207_5.jpg)
(http://i124.photobucket.com/albums/p38/armymedic2/20080207_6.jpg)
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You've got a nice bow going there. Carry on. You've come this far... the end is in sight. You're doing great!
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Looks great. I would be tempted to just pull it all the way. ;D I don't advise listening to me. :D
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Yep, stringing it up got it just about to where you need it, but I would still remove just a very little bit off the mid to outer limbs. It's looking good, though!
Sean
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If you are getting a little set I would say get more bending in the midlimb and outer limb area. The left limb looks OK, the right has a weak spot right at the fade. Justin
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By thinning the tips you can get those outer limbs moving, and this will give you your drawlength. Remember with a built up handle like that the limbs have to move farther to reach 28" at your hand. so the limbs will be drawing about 30" with this style grip, but its still no problem.
Ideally you want the tips to be a rounded 3/8th's inches and a point just past the string..By tapering towards this with very gradual thickness taper from midlimb will get you there.
You are closer than you think to being done..It's looking good..After thinning the tips a bit, I'd be out shooting it to see how it feels. Just loose the arrow if the bow starts to stack..and remove a little more...
Rich
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Rich brings up an interesting point. Are you going to leave the handle that thick. I often glue a handle on only to remove half of it later. If you are going to remove half when shaping the handle, don't forget to hit your target weight 1-2" early because that is where you will really be drawing to. Justin
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Like Rich says. Thin tips. I make mine sometimes 3/16" thick, sometimes 1/4." You are close so slow down and be really careful and happy of course. ;)................................................ Bob
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ok, good ideas, i will be reming a touch of the grip., but not a whole lot(just sinking it a bit for theweb of the hand and rounding off the palm) , as it is going into my dads very large hands. i though i saw a weak spot on the right limb as well. with 7-8 inches more to go, getting the outer limbs working more, do you think that it will always be a weak spot? or will it be bending correctly once the outer limbs are finished? the angle of the camera exagerates it, but i do think it is a bit weak there. not detrimental is it?
if i remover more from the sides of the limbs to narow the tips, i am afraid i will take too much-mainly because i have never done that before . i always roughed it out and tillered from there. pretty new to it still. thanks for all the great advise guys. i showed my dad the progress and he was pumped. im at drill now so won;t be able to work on it till sunday, appreciate all the advice i can get befor i get my hands on it again!