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George

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Reply with quote  #1 
Hello, archers.  I have been looking at so many arrow making sites I am beginning to see them in my sleep.  When I started shooting back in the day it wasn't difficult to find brick and mortar shops that would make up a batch of arrows for you within a few days.  I would go in and tell them what I wanted and my business was done.  I didn't worry about spine charts and all of that, I just left it to the experts.

Well, here we are today.  I have poured over spine charts until I have memorized them.  But, there is one thing that eludes me.  When some arrow makers list their arrows they list an arrow for a bow at 40-45#.   However, when I go to the charts they say that an arrow in that bow wt. range should be spined at 50-55 or within 5# of that.  Is it a case of something taken for granted that all arrows in that bow weight will be spined at 50-55 whether they say it or not?  The rule of thumb seems to be 10# over the bow weight.  I should note that I am looking at Cedar Arrows.

I would much appreciate someone clearing that up for me.  I thank all of you for your patience with questions I should know the answer to and for the wealth of knowledge you all possess. 
fdp

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Reply with quote  #2 
  Actually the way that arrows are SUPPOSED to be spined is in 5lb. spine groups. For instance, 50-54lbs.. %0-55lbs. is a 6 pound spine group.

  Now,  there are additional things that need to be taken in to consideration as well. The type of string material that you are shooting on the bow, the amount of center shot that the bow has, the desired overall arrow length, as well as the weight of the head you desire to shoot.

  Lastly, there are the personal from dynamic factors that can't really be put on a chart.


  Bottom line is that most bows will shoot a much wider range of spines then folks commonly think.  So, if you are shooting a bow that is 45lbs. at your draw length, and you want to shoot an arrow that is 28" to the back of the point,  with a 125-145 gr. point, and a standard string, it's highly likely that you can soot arrows in the 40-44, as well as the 45-50lb. spine groups just fine.

  That is one reason though that I am a huge fan of keeping a "test kit" of arrows around in several of my most often used spine ranges.


aromakr

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Reply with quote  #3 
George:
In the old days most all bow were constructed with their shelf's cut the same depth (1/8" before center) and the strings were made of the same material (Dacron), that is not true today. The depth of center can range from a 1/4" before center to 3/16" past center, a change of as little as 1/16" will change the spine need 5# one way or the other. Changing the string material from Dacron to the new string materials will increase spine need 5#. That is just two factures that change spine need. Today with archers using heavier and heavier point weights you have a third factor to consider.

To further explain shelf depth, let me say this. The deeper the bow's shelf is cut the stiffer the arrow spine must be to prevent the arrow from printing off line of aim. When you shoot, with the arrow directly below the eye and the arrow point in line vertically with the intended arrow impact point, using a right handed shooter in this example an arrow that is too weak will impact the target to the right of point of aim and vice/versa with a stiff arrow.

Bob  

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Selden Slider

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Reply with quote  #4 
What did the Wizard say?  "Pay no attention to the man behind the curtain."  In this case the spine chart.  They're only there to confuse you.  If you're going to do this archery thing for awhile you should learn what it takes to correctly choose the spine your bow requires.  FDP hit the nail on the head with the criteria for choosing the correct spine and Aromkr summed it up well. 

It's really easy.  The only things I would add to his list is your draw length, +5# for every inch past 28" and -5# for every inch less than 28".  The same for arrow length.  BOP more than 28" add 5# for every inch.  Conversely -5# for every inch less than 28". FF strings require +5#.  Dacron nothing.  So there you have it.  Write it down and use it when choosing arrows for a new bow.  Frank

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George

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Reply with quote  #5 
Thanks, guys, for all of the info.  It was helpful.  It's amazing to me how I could have been shooting for so many years and never worried with such technicalities.  I left all that to those who made my arrows, and I have had some good shooters through the years.

P.S.  My shooting was so good that I didn't have to worry about spine at all. [rofl]
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