Primitive Archer
Main Discussion Area => Bows => Topic started by: DC on February 19, 2016, 02:47:03 pm
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I'm tillering a boo-yew recurve and I noticed that one limb lifts off before the other. One is at 11" and the other is about 13". Is this something to be concerned about? It's room temperature cured epoxy and I glued in some Perry reflex so I'd rather not heat it. I'm pulling it 17"@40# right now I'm shooting for 45#@28".
Thanks
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That's part of tillering and "timing" and whether you notice it personally in the shooting characteristics of the bow.
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I don't want to open the timing debate again but how would that manifest itself? Hand shock or????
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Only time I ever got hand shock is from overly thick or heavy tips. Can timing be perfect 2-3 years down the road..? I question this with wood bows.
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When you draw it back your handplacement affects how they lift off. You want them to lay back down evenly when the arrow is being released, your hand will be gone at this point. If it is off you will see the arrow slightly porpoise possibly. You can play with the nocking point and even the height of the arrow rest to tune it.
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When you draw it back your handplacement affects how they lift off. You want them to lay back down evenly when the arrow is being released, your hand will be gone at this point. If it is off you will see the arrow slightly porpoise possibly. You can play with the nocking point and even the height of the arrow rest to tune it.
Yep nothing like fine tuning. Good point about "your hand will be gone at this point"
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When you draw it back your handplacement affects how they lift off. You want them to lay back down evenly when the arrow is being released, your hand will be gone at this point. If it is off you will see the arrow slightly porpoise possibly. You can play with the nocking point and even the height of the arrow rest to tune it.
So if I move the bow right or left on the tree I should notice a change in lift off?
" If it is off you will see the arrow slightly porpoise possibly." This is the kind of answer I was looking for. Something I can look for.
Thanks
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Dc are you far enough along to start slinging arrows, if so film the release and watch what happens
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Not quite, maybe the rain will let up by the time I'm ready.
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I went back to the shop and took a close look. I figured that the limb that was lifting last (top limb) must be straighter so I decided to check the +- tiller. I had about 1/2" negative. (I think I said that right.) Anyway, I evened it out so I have neutral tiller. Presto!! String lift off is the same on both limbs. Now, in hindsight, everyone's posts make sense. I'm now at 20"@ 40# so I could fling a few arrows but I would drown out there. ;D ;D ;D
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I think the same thing happens with a straight tip bow,, we just can't see lift off, but the timing is affected in much the same way,,if the tiller is off,, :)
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DC control the angle of the hooks/levers, sometimes one let go.
Also control your pivot point, a change here changes the tiller!
Positive tiller - asym. bow
Zero tiller - sym. bow
I make most of my statics asym. with pos. tiller - with matching string lift off.
Don't trust the tiller tree, lot of factors to watch
Just my thoughts ...
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Gotta see how it is in the hand.... no one actually shoots off the tiller! >:D
Del
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This is one reason I like making recurves with string bridges. I can tune this just a bit by moving the bridge or making one slightly higher than the other.