Main Discussion Area > Arrows

Shaft spiner?

<< < (5/10) > >>

Bow Bandit:
OHHHH so just move my posts 1 inch farther on either side and it will spine lower but more acurastely????lol i think thats what i have to do...this is the one i have built... http://www.jamesmhill.com/Spine_Tester.html

Thanks Brandon

DCM:
I'm a very practical person.  I just hang a crescent wrench from one end of a shaft suspended in the center on a nail, and held at the other end similarly.  Calibrate using shafting of known deflection.  I used aluminum shafting, being careful to place the center consistenty.  I haven't found bows to be so sensitive to spine that a couple of pounds one way or the other made any difference.

Justin Snyder:
Actually your chart might be off by 2# if you switch to  28". You would need a new chart I think. Probably should leave it alone unless you are going to use tapered or barrel shafts. Spine according to Jim is length/deflection. 26/.565=46# subtract 10# for 2 additional inches=36#     28/.777=36# according to the chart .777 deflection =33-34#  OR I could be all screwed up... Justin

mnewcomb59:
Well Pat you didn't confuse me... I know what you mean. If you are going to shoot a 31 inch shaft just make your arrows spine 15 pounds higher... The deflection will still be the same even if the posts are farther apart. If it pulls down .565 then it will still be 50#, the length of the shaft doesn't matter.

Bow Bandit:
oh i finally get it lol ...ill just make it to 28 considering it will be the same also i will put a piece of dowel on top of the dial indicator to make it so the shaft doesnt need to be PERFECTLY straight...thanks for the help guys...

Brandon

Navigation

[0] Message Index

[#] Next page

[*] Previous page