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The finer points of tillering

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Davepim:

--- Quote from: alanesq on October 21, 2009, 07:05:35 am ---the important thing is where the centre of hard contact with your hand is in relation to the centre of the bow when you draw it

If the arrow pass is 1" above the bows centre then I think this will put this point at about the centre of the bow

the confusion seems to be that because the handle is not at the centre of the bow people think the limbs are different lengths


--- End quote ---

I think you've put your finger on it there Alan!

bobnewboy:
The way I had it explained to me is that for most archers, the mediterranean loose or similar is used.  Since this puts more fingers under the arrow than above, the fulcrum point formed by the string fingers pulling the string is below the arrow pass, and hence more effort is put into the lower limb.  To alleviate this somewhat the arrow pass is moved up the bow by about the same width as two fingers pushed side by side on the string - approx 1".

In the end everyone making bows has their own way of marking and tillering which works for them.  So long as the bow feels balanced at full draw, and shoots smoothly, the finest details are just personal quirks really, IMO.  ;D

Del the cat:
There are no rules.
A bow is at first glance symetrical and you'd think both limbs the same length.
But just think about it...
If you mark the geometric centre of the bow and have the arrow there, then your hand will be below it, effectively shortening the lower limb. Factor in you have two fingers below the arrow and one above....more assymetry.
It's about compromise, and you can decide on your own... the arrow 1" above geometric centre is pretty sound.
The longer the bow, the less important it becomes (1" away from centre in a 72" bow is a smaller part than 1" in a 48" bow)
All of this is one reason why you should be carefull when tillering to support the bow where the hand pressure will be and draw the string back were the finger pressure will be. The assymetry also means if you have one limb stronger than the other then adjsuting the hand/arrow position or turning the bow up the other way may help cure the problem.
Your time is up...please insert another coin.
Del

Ian.:
Remembering that archrs would mainly use 2 fingers to draw not 3, I dont think that a heavy bow will be that effected by having the arrow pass in the middle none of mine ever has been.

Tom Leemans:
The ol' debate or investigation of equal vs unequal length limbs has been going on forever. I think it has more to do with A: the dynamic fulcrum of the bow being in the web of your bow hand, as referred to above. Lends itself to balance properly in your hand; and B: Having the arrow pass nearer to the geometric center of the bow, lending to pointability. I guess this will be discussed as long as we continue to make bows.

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