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Is Limb Timing an Issue?

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Del the cat:
People were talking about limb timing on a recent thread.
I find it hard to see how the limbs can return at different times, after all the limb tips are connected by the string!
They are balanced at brace, and (unless the grip is somehow clamped in an unbalanced position) the force is in balance at every point from brace to full draw, and thus presumably during the return as the arrow is loosed.
The only imbalance I can see is if someone is string walking (a hideous practice for a wooden bow)

They are not "individual" limbs, the whole bow is effectively one continuous spring. Even a very asymmetric bow like a Yumi remains in balance throughout the draw.
Is there any video evidence of limbs returning out of synch'? I can see it happening with a compound (spits on floor) if the cams don't match.
Anyone got any explanation, comments thoughts?
I'm happy to be shown to be wrong and have my understanding (or lack of it) enhanced.
Del (confused of Harlow)

Eric Krewson:
Timing might not be the right word, perhaps balance would work better. I have had shocky bows with one limb that felt slightly stronger at full draw than the other, I would give the suspected limb a full-length belly sanding a little at a time to see if the shock got better, it usually did and smoothed out. This is a shoot and feel kind of thing. I have sanded the suspect limb and the shock got worse, I realized I was working on the wrong limb.

After shooting bows for 65 years this "feel" isn't something I can describe, I just sense it.

Mo_coon-catcher:
I’ve always thought the same Del. I feel it has more to do with the location of the vibrations in the bow. Watching low motion videos of the bows shot, they all vibrate. So really you want the oacillation waves to hit their valleys or atleast crossover at the neutral plane, at the handle so that spot doesn’t move. If the peaked both hit you hand at the same time you’ll get lots of movement. I think that different shaped tiles induce a different vibration wave and the goal is to get matching waves so they consistently oscillate in the same way. And the limb tuning/timing is shifting these waves independently until the oscillation reaches a point that either tolerable or goes away at the handle.

I hope this rambling gets my thoughts across

Kyle

Marc St Louis:

--- Quote from: Del the cat on August 28, 2024, 10:02:21 am ---People were talking about limb timing on a recent thread.
I find it hard to see how the limbs can return at different times, after all the limb tips are connected by the string!
They are balanced at brace, and (unless the grip is somehow clamped in an unbalanced position) the force is in balance at every point from brace to full draw, and thus presumably during the return as the arrow is loosed.
The only imbalance I can see is if someone is string walking (a hideous practice for a wooden bow)

They are not "individual" limbs, the whole bow is effectively one continuous spring. Even a very asymmetric bow like a Yumi remains in balance throughout the draw.
Is there any video evidence of limbs returning out of synch'? I can see it happening with a compound (spits on floor) if the cams don't match.
Anyone got any explanation, comments thoughts?
I'm happy to be shown to be wrong and have my understanding (or lack of it) enhanced.
Del (confused of Harlow)

--- End quote ---

There's been talk of limb timing over the years.  To me the only way you could have a timing issue is if there is an imbalance in the limbs, specifically the mass.  You'd have to be a pretty crappy bowyer to have that much mass imbalance to create an issue

Pappy:
Yep very much agree with above. I hear it but usually don’t comment because didn’t really know I to explain why I thought it but Del done a fine job.👍 Pappy

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