Primitive Archer

Main Discussion Area => Arrows => Topic started by: Sammakesbows on July 09, 2020, 05:27:20 pm

Title: How to spine a tapered shaft?
Post by: Sammakesbows on July 09, 2020, 05:27:20 pm

Im preparing some shafts for a trade. They are branches. How do you spine them? It seems like it would be different from a straight shaft.

Title: Re: How to spine a tapered shaft?
Post by: Pat B on July 09, 2020, 08:27:06 pm

You will need one of the uprights to be adjustable so you can zero the spine tester for each shaft.

Title: Re: How to spine a tapered shaft?
Post by: Sammakesbows on July 10, 2020, 12:30:34 pm

Quote from: Pat B on July 09, 2020, 08:27:06 pm

You will need one of the uprights to be adjustable so you can zero the spine tester for each shaft.

What does that mean? Are you talking about tilting the arrow until the weight is in the center?

Title: Re: How to spine a tapered shaft?
Post by: Pat B on July 10, 2020, 05:10:25 pm

What kind of spine tester do you have?

Title: Re: How to spine a tapered shaft?
Post by: Sammakesbows on July 10, 2020, 11:57:56 pm

Quote from: Pat B on July 10, 2020, 05:10:25 pm

What kind of spine tester do you have?

Its just two posts 26 inches from eachother, with the calipers, like the one from Poor Folk Bows.

Title: Re: How to spine a tapered shaft?
Post by: Pat B on July 11, 2020, 06:38:13 am

If you take one of the posts and make it movable so you can have the caliper at "0" and the shaft touching it at "0" then it will read the correct spine of any shaft, tapered, crooked or straight. You have to make this adjustment with each of the 4 sides so you can find the still side and get the spine of the arrow.

Title: Re: How to spine a tapered shaft?
Post by: Sammakesbows on July 11, 2020, 09:33:13 am

Quote from: Pat B on July 11, 2020, 06:38:13 am

If you take one of the posts and make it movable so you can have the caliper at "0" and the shaft touching it at "0" then it will read the correct spine of any shaft, tapered, crooked or straight. You have to make this adjustment with each of the 4 sides so you can find the  still side and get the spine of the arrow.

Do you make the adjustments before or after putting the weight on? Because a tapered shaft is still straight (not parallel). From what i read, you zero in the calipers before you put the weight on.

Title: Re: How to spine a tapered shaft?
Post by: JackCrafty on July 11, 2020, 11:35:23 am

Tapered shafts are spined exactly like parallel shafts. No one, that I know of, does it any differently.

There is a difference in the dynamic spine but you will confuse your customer if you try to compensate for that on the spine tester.

Title: Re: How to spine a tapered shaft?
Post by: Pat B on July 11, 2020, 12:12:44 pm

The tester has to be zeroed to the shaft before the weight is added.