From: yahooty
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Date: 12-Jun-18 |
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I want to measure the weight of a bow @ 28" (per AMO standards).
So do I measure 28" from the throat of the nock to the belly of the bow? Or from the throat of the nock to the deepest part of the grip at 26-1/4" then add 1-3/4"??
Little help please.
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From: yahooty
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Date: 12-Jun-18 |
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Never mind. As soon as I posted this I saw the other thread right above it.
Looks like 26-1/4 + 1-3/4" will do it.
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From: fdp
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Date: 12-Jun-18 |
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And here is the standard itself:
AMO BOW WEIGHT STANDARD For Conventional Bows Bow weight is the force required to draw the nocking point of the bow string a given distance from the pivot point of the bow grip (or the theoretical vertical projection of a tangency line to the pivot point parallel to the string). Draw length from pivot point shall be designated as DLPP and shall be referred to as TRUE DRAW LENGTH. For the purpose of uniform bow weight designation, bow weight is the force required to draw the bow string 26 1/4” from the pivot point. This weight will be marked on bow as being taken at 28” draw (26 1/4” plus 1 3/4” = 28”) See DRAW LENGTH STANDARD. EXAMPLE: Weight Adjustment Range: 45/55 lbs. Weight Set At: 50 lbs.; Hold 32 lbs. Draw Length Range: 29” - 30” EXPLANATION: The pivot point is a more realistic measuring point (when compared to the variations of profile of the back of bows at the handle section) for establishing bow weight since the pivot point is a constant in all bows as well as the contact point of the bow hand from which the true draw length is generated. The 26 1/4” DLPP is the approximate equivalent of the 28” draw used previously on the more massive wooden handle bows.
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From: fdp
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Date: 12-Jun-18 |
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Michael, when you take the 26.25" measurement you don't have to add anything. That is AMO 28". The 1.75" measurement is just an industry standard due to the different widths of arrow shelves that exist.
There are occassions depending on bow design where you are only drawing the string 26.25" to anchor, but it would take a 29" or 30" arrow to clear the back of the bow. It's still AMO 28".
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From: 2 bears
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Date: 12-Jun-18 |
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You got it. Most everyone measures to the face of the bow now days. It usually comes out pretty close to the same but there are some pretty radical bows. If your bow happens to be very close to 1 3/4 to the face at the arrow rest from the throat,it is much easier to measure to the face.>>>----> Ken
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From: yahooty
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Date: 12-Jun-18 |
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Thanks guys. Can't believe I missed that other thread.
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From: ModernLongbow
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Date: 12-Jun-18 |
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There is only one correct way. 26.25 from string to throat of grip is 28” AMO
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From: fdp
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Date: 12-Jun-18 |
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Yes we were Ken. :)
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