need a little knolage

[terryzac]

ok i use a 80# longbow ( d bow, selfbow ) and i'm trying to put together some traditional style arrows. they will be trad except for the broadheads. i have the shafts which i purchased nealy 2 years ago now ( cant rush these things). i will be using turkey feathers when i get them. my prob is the weight i should use for the broadheads. i also have some that i got years ago but dont know much about them. how do you determin how many grains somthing is, and what do i need
thank you
terry

[Steven J]

The mass of the broadhead depends on the spine of your arrows and your draw length also. Since there is no shelf on your bow, I would be shooting 70-75lb spined arrows at 28" in length with a 125g broadhead. If you wish to increase the mass of the broadhead you can increase the spine of the arrow. If you increase the length of your arrow, you should increase the spine of the arrow also - about 5lb per inch is a good rule of thumb.

Spining arrows is a bit of trial and error. The most important factor that I have found is that all the arrows are spined the same. Even if they are a little out of spine, the fletching will straighten the arrow and they should all hit the same spot. With practice your mind should make the adjustments needed to hit the spot you are looking at.

Steve

[matt61]

Hi Terry I have a cheap digital grain scale,paid $70 for it,makes working out weights easy up to 1000 grains you might get one cheaper at Cashconverters or Ebay.
Matt

[Gringa Bows]

or you could try Scrub bull,i think i paid $35 for mine..................Rod

[Steven J]

As Matt said, try ebay for scales. They may not always measure in grains, but you can always convert (1g = 15.4324 grains). You should not pay more than about $25 for a 1 decimal place scale.

Steve

[longbow steve]

Grain scales are available via Amso 128/JCM, I think the last set I purchased was around the 30-40 dollar mark. Steve

[Gringa Bows]

i know i'm going to sound like a dummy but what do you mean by 1 decimal place scale,Steven....the set i've got has g,oz,dwt,gn.and as Steve said John has scales too....Rod

[GrahameA]

Hi Rod

i know i'm going to sound like a dummy but what do you mean by 1 decimal place scale,Steven....the set i've got has g,oz,dwt,gn.and as Steve said John has scales too....Rod

If I weigh something and the scale says:

1.0 then it is weighing to within 1 decimal place. i.e. there is one figure after the decimal point. It actual weight (as far as the scale is concerned which may not be its true weight) will lie in the range

0.95 to 1.04
------
Extra Boring Stuff

Plus on top of this, if we were interested, would be how accurate the scale is and what doe its calibration chart look like.

So we could bop on down to the local Metrology Lab and run the scale against a set of known values and determine just how accurate the scale is across it range of measurement. It all depends on what you want.

And are you interested in weight or mass?

[terryzac]

thanks guys for all the info. the conversion rate will help immensley.
what should the max weight of the broad head be for a 28 1/2" draw. this measure is from the knock where the string sits to the front of the bow. is this the correct way to determine draw length
thank you
terry

[matt61]

Terry I would only buy a scale from Cashconverters as a last resort as when I last looked the prices where a bit steep for a secondhand one as there is a big demand by the local lads for weighing their sun dried tomato leaves and powders for their energy drinks
Matt

[Trad Bound]

Matt
there maybe a couple of Lines there but I will leave them alone this time

[pdccr]

Had to read it twice to pick up on that

[Gringa Bows]

..................and thanks Grahame for clearing that up for me ..........Rod

[terryzac]

i always wondered what was in those energy drinks
terry

[matt61]

Tradbound I think you snort of got the picture
Matt

[wal]

jeez Matt, your on a row, I mean, roll, tonight

[matt61]

Another thing with buying secondhand grain scales from Crimeconverters is don't take it with you in your luggage when you fly to your next big hunting trip or you could have one of those sniffer dogs at the airport sit down next to you and look at you with a look of YOUR **** IS GRASS in its eyes.
Matt