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Author Topic: Arrows spine from grains?  (Read 3878 times)

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Offline Blaflair2

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Arrows spine from grains?
« on: August 16, 2015, 10:35:21 am »
I have some Easton blemishes that I'm not 100% on spine. They're too heavy for the bow I need arrows for. Great groups about a foot left. Once I get home I can see what the gpi is and post. Was wondering if someone could tell me what spine they are and then I could maybe get some broad head adapters to adjust to desired spine?
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Offline aaron

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Re: Arrows spine from grains?
« Reply #1 on: August 16, 2015, 11:03:15 am »
what model eastons? they should have a spine number on them such as "400" or ".400"
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Ilwaco, Washington, USA
"Good wood makes great bows, but bad wood makes great bowyers"

Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #2 on: August 16, 2015, 11:36:16 am »
I have to check when I get home.
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Offline aaron

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Re: Arrows spine from grains?
« Reply #3 on: August 16, 2015, 01:46:43 pm »
Do they already have inserts glued in? If so, increasing point weight may be easiest.
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Ilwaco, Washington, USA
"Good wood makes great bows, but bad wood makes great bowyers"

Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #4 on: August 16, 2015, 02:58:57 pm »
Yeah they have inserts. Point weight is the only way to take the spine down is t it?
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Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #5 on: August 16, 2015, 05:57:35 pm »
They are 32", 500 grains with 150 feild points. It's not even on the chart :o what are my options. And how far off is it lol?
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Offline JoJoDapyro

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Re: Arrows spine from grains?
« Reply #6 on: August 17, 2015, 10:20:53 am »
What Spine rating? My spine tester cost me about $14 to build.
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline aaron

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Re: Arrows spine from grains?
« Reply #7 on: August 17, 2015, 01:48:50 pm »
we still need to know the spine- when you say "500 grains", is that a measured weight, i.e. did you weigh them on a scale? Or does it say "500" on the shaft? tell us everything it says on the shaft.
shafts are usually marked with two numbers:
GPI tells you how much the shaft weighs per inch, this is the shaft alone. it has nothing to do with stiffness.
The other number is stiffness- usually says "500" or .500 or something like that

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Ilwaco, Washington, USA
"Good wood makes great bows, but bad wood makes great bowyers"

Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #8 on: August 17, 2015, 02:21:57 pm »
All it says is gold tip blemishes 3555, I looked them up and it said they're 500 grains. They are 32" long. It's not even on the arrow chart on the box. Lol
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Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #9 on: August 17, 2015, 02:30:06 pm »
So I found they are 8.6 grains per inch. Does that help? So the arrow should weigh 275.2 grains? What spine is that?
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Offline JoJoDapyro

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Re: Arrows spine from grains?
« Reply #10 on: August 17, 2015, 03:08:53 pm »
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #11 on: August 17, 2015, 03:10:49 pm »
So in weight what is that?
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Offline JoJoDapyro

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Re: Arrows spine from grains?
« Reply #12 on: August 17, 2015, 03:13:37 pm »
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline Blaflair2

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Re: Arrows spine from grains?
« Reply #13 on: August 17, 2015, 03:16:33 pm »
Why do they go to the left then? Shouldn't they go right?
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Offline JoJoDapyro

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Re: Arrows spine from grains?
« Reply #14 on: August 17, 2015, 04:46:07 pm »
From a center shot bow? Good question. Do they shoot well from anything else?
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.
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