new digital scale question

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lvt01
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new digital scale question

Post by lvt01 » Wed Dec 28, 2011 9:24 pm

I just bought one of those cheap digital scales off the net to play around with arrow weights. I'm hoping someone can explain this to me. This scale weighs in grams, ounces, carats and grains....I'm guessing that is what gn stands for. Now if I understand this correctly...a Firebolt with a 150 grain field point should weigh around 417 grains. Now what I get on this scale is...98.8 grams, 3.48 ounces, 494 carats or 1525 grains. I've triple checked the calibration on it and it always comes up the same. So...can anyone explain this in simple terms to this old brain of mine? :?

Thanks!
Larry

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munch
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Re: new digital scale question

Post by munch » Wed Dec 28, 2011 9:53 pm

i just put a easton power carbon bolt with a 100grain point on mine and it shows 1.04 oz 456 gr 147ct i bought my scale at harbour freight one day on sale for $9.99 regular $14.99 and works the same as a $60 one i bought it just does not say archery scale on it .if you have one of those stores near you mine is a US balance professional precision pocket scale .just think you may have got a bad one
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munch
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Re: new digital scale question

Post by munch » Wed Dec 28, 2011 9:58 pm

just had a thought .does the scale have some kind an addition key where you do like a calculator where you go plus 1 plus one 1 its almost like you have the weight of 4 arrows in your post if that makes scene
my scale also says do not operate near electronic devices such as microwave refigerators cellullar phone computer ect. operating scale near such devices can cause false readings and even damage the scale
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Re: new digital scale question

Post by vixenmaster » Wed Dec 28, 2011 10:12 pm

Did you get some calibration weights with it to set yer scale ?
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lvt01
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Re: new digital scale question

Post by lvt01 » Wed Dec 28, 2011 10:17 pm

it does have number of pieces, but only says 1. I was trying it near the computer, but I don't think that was it either. Maybe just wasted $9.00 on some cheap junk. Wouldn't be the first tme I've been burned. Oh well...I'll keep putzing with it and maybe I can find the cause. Just was wondering if I really was doing something totally wrong. Thanks for your input munch.


Larry

lvt01
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Re: new digital scale question

Post by lvt01 » Wed Dec 28, 2011 10:19 pm

vixenmaster wrote:Did you get some calibration weights with it to set yer scale ?

Nope. Was using a piece of lead that weighs 2 ounces. That could be the issue too. Better reread the directions.

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Dash
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Re: new digital scale question

Post by Dash » Wed Dec 28, 2011 10:36 pm

Sounds like you may just have bought a dodgy one.
They're usually very accurate. Just make sure you use it on on a flat hard surface, and let it calibrate zero for a few seconds before putting something on it. Most take a few seconds to calibrate zero properly before you can use them.

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Re: new digital scale question

Post by nchunterkw » Wed Dec 28, 2011 10:48 pm

Larry,
Unfortunately it looks like something is off with the scale.
There are 15.43236 grains in 1 gram.
There are 28.3495 grams in 1 ounce.
Firebolt with 150 grain head should be around 415 grains = 26.90grams = 0.95oz.

You said 3.48oz, which would be 98.66 grams, which is 1522 grains. So it looks like your scale is doing the math right, but the measurement is off.

Make sure to use it on a hard surface and to make sure the arrow is balanced on the scale and not touching anything. It almost seems like the scale got zeroed with something pushing up on it from the bottom. If something was accidentally touching the top, it would report lower weights.
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lvt01
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Re: new digital scale question

Post by lvt01 » Wed Dec 28, 2011 10:56 pm

Figured it out. I was calibrating it wrong. (Operator error as usual) I was supposed to hit the calibration button a 2nd time to hold it and I wasn't doing it. Basically it kept going back to what it originally was set for. Now my 150 grain field points are coming up at 151-152 grains. I can live with that. At least it gives me some idea where my arrows are now. Thanks for all the quick input guys!.

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Re: new digital scale question

Post by onebigskittle » Wed Dec 28, 2011 10:58 pm

munch wrote:i just put a easton power carbon bolt with a 100grain point on mine and it shows 1.04 oz 456 gr 147ct i bought my scale at harbour freight one day on sale for $9.99 regular $14.99 and works the same as a $60 one i bought it just does not say archery scale on it .if you have one of those stores near you mine is a US balance professional precision pocket scale .just think you may have got a bad one
Are you using brass inserts munch? ..I get 456 also but with 150 gr point
I get 344.2 with brass insert and no point.
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munch
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Re: new digital scale question

Post by munch » Thu Dec 29, 2011 6:32 am

onebigskittle wrote:
munch wrote:i just put a easton power carbon bolt with a 100grain point on mine and it shows 1.04 oz 456 gr 147ct i bought my scale at harbour freight one day on sale for $9.99 regular $14.99 and works the same as a $60 one i bought it just does not say archery scale on it .if you have one of those stores near you mine is a US balance professional precision pocket scale .just think you may have got a bad one
Are you using brass inserts munch? ..I get 456 also but with 150 gr point
I get 344.2 with brass insert and no point.
the arrows i'm shooting are Easton power carbon with both alum inserts
are you shooting fire bolts .no so sure we are doing apples to apples .
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nchunterkw
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Re: new digital scale question

Post by nchunterkw » Thu Dec 29, 2011 10:11 am

I think these cheapo scales are great for what we are generally doing....but I doubt they are very accurate for an "absolute" weight. But that is generally not of primary concern. What they will show you is how much arrows, points, etc vary between each other (great indicator of good and not so good manufacturers) and will let you build up arrows that match each other. The accuracy they give on absolute numbers is most likely fine as well. You mught be off a few grains on total weight, but that won't affect calculations of KE or Momentum too much.

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onebigskittle
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Re: new digital scale question

Post by onebigskittle » Thu Dec 29, 2011 11:36 am

Must not be munch...im shooting easton power bolts with alum inserts also
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lvt01
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Re: new digital scale question

Post by lvt01 » Thu Dec 29, 2011 11:51 am

I weighed a few of my arrows last night and was really quite surprised in how much variation there are between them. I really am going to start looking into building my own. Heck...I can't do any worse than the store bought ones! :lol:

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munch
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Re: new digital scale question

Post by munch » Thu Dec 29, 2011 6:47 pm

onebigskittle wrote:Must not be munch...im shooting easton power bolts with alum inserts also
thought i better check the arrow i did was with a 125 tip blazers 7"wrap lots of glue and 2 -42 grain alum inserts for a total of 456gr.i did turn down some brass on my lathe one time and made some real front heavy inserts .wonder how a 3" long brass insert would make them fly sure could get some foc
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