Primitive Archer

Main Discussion Area => Arrows => Topic started by: jermcramp1 on December 21, 2011, 07:32:06 pm

Title: Spine without tester question
Post by: jermcramp1 on December 21, 2011, 07:32:06 pm

I dont have a spine tester  ??? so with using two horizontal nails in the wall and a 2lb weight, how far below the plain of the nails should the bottom of the arrow bend roughly for a 60# bow? using bamboo shafts.

I know its not exact but I was wanting a general idea.

Title: Re: Spine without tester question
Post by: Gus on December 21, 2011, 07:47:20 pm

Here are a couple of good links to the topic.

http://www.primitivearcher.com/smf/index.php/topic,4589.0.html

http://www.primitivearcher.com/smf/index.php/topic,446.0.html

-gus

Title: Re: Spine without tester question
Post by: stringstretcher on December 21, 2011, 08:33:54 pm

The deflection for a 60# arrow is .433 thousandths.  So you need the arrow to bend that much above or below the plane of the nails.

Title: Re: Spine without tester question
Post by: Pat B on December 21, 2011, 09:49:05 pm

When I'm making my primitive cane or sourwood shoot arrows I only use a spine tester to find the stiff side of the arrow(goes against the bow) and in some cases you can feel that just by bending the shaft.

Title: Re: Spine without tester question
Post by: scattershot on December 21, 2011, 10:02:21 pm

If you really want to make it simple, find an arrow that shoots well from your bow, and spine your arrows to match it.

Title: Re: Spine without tester question
Post by: bowtarist on December 21, 2011, 11:49:45 pm

make sure you put your nails 26" apart.  just good practice incase you ever want to make one to AMO spec. someday.  I learned that on here  ;) dpgratz

Title: Re: Spine without tester question
Post by: crooketarrow on December 22, 2011, 10:09:14 am

  I do the same except I have a ruler add between my nails. Different inkerments or different weights. Works good for shoot arrows and finding the stiff sides of shafts.